From: zhangxuezhi <[email protected]>
For st7789v ic,when we need continuous full screen refresh, it is best to
wait for the TE signal arrive to avoid screen tearing
Signed-off-by: zhangxuezhi <[email protected]>
---
v10: additional notes
v9: change pr_* to dev_*
v8: delete a log line
v7: return error value when request fail
v6: add te gpio request fail deal logic
v5: fix log print
v4: modify some code style and change te irq set function name
v3: modify author and signed-off-by name
v2: add release te gpio after irq request fail
---
drivers/staging/fbtft/fb_st7789v.c | 132 ++++++++++++++++++++++++++++++++++++-
drivers/staging/fbtft/fbtft.h | 1 +
2 files changed, 132 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/fbtft/fb_st7789v.c b/drivers/staging/fbtft/fb_st7789v.c
index 3a280cc..cba08a8 100644
--- a/drivers/staging/fbtft/fb_st7789v.c
+++ b/drivers/staging/fbtft/fb_st7789v.c
@@ -9,9 +9,12 @@
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/kernel.h>
+#include <linux/mutex.h>
+#include <linux/interrupt.h>
+#include <linux/completion.h>
#include <linux/module.h>
#include <video/mipi_display.h>
-
+#include <linux/gpio/consumer.h>
#include "fbtft.h"
#define DRVNAME "fb_st7789v"
@@ -66,6 +69,32 @@ enum st7789v_command {
#define MADCTL_MX BIT(6) /* bitmask for column address order */
#define MADCTL_MY BIT(7) /* bitmask for page address order */
+#define SPI_PANEL_TE_TIMEOUT 400 /* msecs */
+static struct mutex te_mutex;/* mutex for set te gpio irq status */
+static struct completion spi_panel_te;
+
+static irqreturn_t spi_panel_te_handler(int irq, void *data)
+{
+ complete(&spi_panel_te);
+ return IRQ_HANDLED;
+}
+
+static void set_spi_panel_te_irq_status(struct fbtft_par *par, bool enable)
+{
+ static int te_irq_count;
+
+ mutex_lock(&te_mutex);
+
+ if (enable) {
+ if (++te_irq_count == 1)
+ enable_irq(gpiod_to_irq(par->gpio.te));
+ } else {
+ if (--te_irq_count == 0)
+ disable_irq(gpiod_to_irq(par->gpio.te));
+ }
+ mutex_unlock(&te_mutex);
+}
+
/**
* init_display() - initialize the display controller
*
@@ -82,6 +111,33 @@ enum st7789v_command {
*/
static int init_display(struct fbtft_par *par)
{
+ int rc;
+ struct device *dev = par->info->device;
+
+ par->gpio.te = devm_gpiod_get_index_optional(dev, "te", 0, GPIOD_IN);
+ if (IS_ERR(par->gpio.te)) {
+ rc = PTR_ERR(par->gpio.te);
+ dev_err(par->info->device, "Failed to request te gpio: %d\n", rc);
+ return rc;
+ }
+ if (par->gpio.te) {
+ init_completion(&spi_panel_te);
+ mutex_init(&te_mutex);
+ rc = devm_request_irq(dev,
+ gpiod_to_irq(par->gpio.te),
+ spi_panel_te_handler, IRQF_TRIGGER_RISING,
+ "TE_GPIO", par);
+ if (rc) {
+ dev_err(par->info->device, "TE request_irq failed.\n");
+ devm_gpiod_put(dev, par->gpio.te);
+ return rc;
+ }
+
+ disable_irq_nosync(gpiod_to_irq(par->gpio.te));
+ } else {
+ dev_info(par->info->device, "%s:%d, TE gpio not specified\n",
+ __func__, __LINE__);
+ }
/* turn off sleep mode */
write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
mdelay(120);
@@ -137,6 +193,9 @@ static int init_display(struct fbtft_par *par)
*/
write_reg(par, PWCTRL1, 0xA4, 0xA1);
+ /*Tearing Effect Line On*/
+ if (par->gpio.te)
+ write_reg(par, 0x35, 0x00);
write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
if (HSD20_IPS)
@@ -145,6 +204,76 @@ static int init_display(struct fbtft_par *par)
return 0;
}
+/*****************************************************************************
+ *
+ * int (*write_vmem)(struct fbtft_par *par);
+ *
+ *****************************************************************************/
+
+/* 16 bit pixel over 8-bit databus */
+static int st7789v_write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len)
+{
+ u16 *vmem16;
+ __be16 *txbuf16 = par->txbuf.buf;
+ size_t remain;
+ size_t to_copy;
+ size_t tx_array_size;
+ int i;
+ int ret = 0;
+ size_t startbyte_size = 0;
+
+ fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "st7789v ---%s(offset=%zu, len=%zu)\n",
+ __func__, offset, len);
+
+ remain = len / 2;
+ vmem16 = (u16 *)(par->info->screen_buffer + offset);
+
+ if (par->gpio.dc)
+ gpiod_set_value(par->gpio.dc, 1);
+
+ /* non buffered write */
+ if (!par->txbuf.buf)
+ return par->fbtftops.write(par, vmem16, len);
+
+ /* buffered write */
+ tx_array_size = par->txbuf.len / 2;
+
+ if (par->startbyte) {
+ txbuf16 = par->txbuf.buf + 1;
+ tx_array_size -= 2;
+ *(u8 *)(par->txbuf.buf) = par->startbyte | 0x2;
+ startbyte_size = 1;
+ }
+
+ while (remain) {
+ to_copy = min(tx_array_size, remain);
+ dev_dbg(par->info->device, " to_copy=%zu, remain=%zu\n",
+ to_copy, remain - to_copy);
+
+ for (i = 0; i < to_copy; i++)
+ txbuf16[i] = cpu_to_be16(vmem16[i]);
+
+ vmem16 = vmem16 + to_copy;
+ if (par->gpio.te) {
+ set_spi_panel_te_irq_status(par, true);
+ reinit_completion(&spi_panel_te);
+ ret = wait_for_completion_timeout(&spi_panel_te,
+ msecs_to_jiffies(SPI_PANEL_TE_TIMEOUT));
+ if (ret == 0)
+ dev_err(par->info->device, "wait panel TE time out\n");
+ }
+ ret = par->fbtftops.write(par, par->txbuf.buf,
+ startbyte_size + to_copy * 2);
+ if (par->gpio.te)
+ set_spi_panel_te_irq_status(par, false);
+ if (ret < 0)
+ return ret;
+ remain -= to_copy;
+ }
+
+ return ret;
+}
+
/**
* set_var() - apply LCD properties like rotation and BGR mode
*
@@ -259,6 +388,7 @@ static int blank(struct fbtft_par *par, bool on)
.gamma = HSD20_IPS_GAMMA,
.fbtftops = {
.init_display = init_display,
+ .write_vmem = st7789v_write_vmem16_bus8,
.set_var = set_var,
.set_gamma = set_gamma,
.blank = blank,
diff --git a/drivers/staging/fbtft/fbtft.h b/drivers/staging/fbtft/fbtft.h
index 76f8c09..93bac05 100644
--- a/drivers/staging/fbtft/fbtft.h
+++ b/drivers/staging/fbtft/fbtft.h
@@ -212,6 +212,7 @@ struct fbtft_par {
struct gpio_desc *wr;
struct gpio_desc *latch;
struct gpio_desc *cs;
+ struct gpio_desc *te;
struct gpio_desc *db[16];
struct gpio_desc *led[16];
struct gpio_desc *aux[16];
--
1.9.1
On Wed, Jan 27, 2021 at 09:42:52PM +0800, Carlis wrote:
> From: zhangxuezhi <[email protected]>
>
> For st7789v ic,when we need continuous full screen refresh, it is best to
> wait for the TE signal arrive to avoid screen tearing
>
> Signed-off-by: zhangxuezhi <[email protected]>
Please slow down and wait at least a day between patch submissions,
there is no rush here.
And also, ALWAYS run scripts/checkpatch.pl on your submissions, so that
you don't have a maintainer asking you about basic problems, like are in
this current patch :(
thanks,
greg k-h
On Wed, 27 Jan 2021 14:51:55 +0100
Greg KH <[email protected]> wrote:
> On Wed, Jan 27, 2021 at 09:42:52PM +0800, Carlis wrote:
> > From: zhangxuezhi <[email protected]>
> >
> > For st7789v ic,when we need continuous full screen refresh, it is
> > best to wait for the TE signal arrive to avoid screen tearing
> >
> > Signed-off-by: zhangxuezhi <[email protected]>
>
> Please slow down and wait at least a day between patch submissions,
> there is no rush here.
>
> And also, ALWAYS run scripts/checkpatch.pl on your submissions, so
> that you don't have a maintainer asking you about basic problems,
> like are in this current patch :(
>
> thanks,
>
> greg k-h
hi,
This is my first patch contribution to Linux, so some of the rules
are not very clear .In addition, I can confirm that before sending
patch, I check it with checkPatch.py every time.Thank you very much for
your help
regards
zhangxuezhi
On Wed, Jan 27, 2021 at 10:08:09PM +0800, carlis wrote:
> On Wed, 27 Jan 2021 14:51:55 +0100
> Greg KH <[email protected]> wrote:
>
> > On Wed, Jan 27, 2021 at 09:42:52PM +0800, Carlis wrote:
> > > From: zhangxuezhi <[email protected]>
> > >
> > > For st7789v ic,when we need continuous full screen refresh, it is
> > > best to wait for the TE signal arrive to avoid screen tearing
> > >
> > > Signed-off-by: zhangxuezhi <[email protected]>
> >
> > Please slow down and wait at least a day between patch submissions,
> > there is no rush here.
> >
> > And also, ALWAYS run scripts/checkpatch.pl on your submissions, so
> > that you don't have a maintainer asking you about basic problems,
> > like are in this current patch :(
> >
> > thanks,
> >
> > greg k-h
>
> hi,
> This is my first patch contribution to Linux, so some of the rules
> are not very clear .In addition, I can confirm that before sending
> patch, I check it with checkPatch.py every time.Thank you very much for
> your help
Please read Documentation/SubmittingPatches which has a link to the
checklist and other documentation you should read.
And I doubt you are running checkpatch on your submission, as there is
obvious coding style issues in it. If so, please provide the output as
it must be broken :(
thanks,
greg k-h
On Wed, Jan 27, 2021 at 09:42:52PM +0800, Carlis wrote:
> For st7789v ic,when we need continuous full screen refresh, it is best to
> wait for the TE signal arrive to avoid screen tearing
> diff --git a/drivers/staging/fbtft/fb_st7789v.c b/drivers/staging/fbtft/fb_st7789v.c
> index 3a280cc..cba08a8 100644
> --- a/drivers/staging/fbtft/fb_st7789v.c
> +++ b/drivers/staging/fbtft/fb_st7789v.c
> @@ -9,9 +9,12 @@
> #include <linux/delay.h>
> #include <linux/init.h>
> #include <linux/kernel.h>
> +#include <linux/mutex.h>
> +#include <linux/interrupt.h>
> +#include <linux/completion.h>
> #include <linux/module.h>
> #include <video/mipi_display.h>
> -
> +#include <linux/gpio/consumer.h>
Space after local headers. Also this should one up so all Linux headers
are group together. You agreed?
> #include "fbtft.h"
>
> #define DRVNAME "fb_st7789v"
> @@ -66,6 +69,32 @@ enum st7789v_command {
> #define MADCTL_MX BIT(6) /* bitmask for column address order */
> #define MADCTL_MY BIT(7) /* bitmask for page address order */
>
> +#define SPI_PANEL_TE_TIMEOUT 400 /* msecs */
> +static struct mutex te_mutex;/* mutex for set te gpio irq status */
Space after ;
> +static struct completion spi_panel_te;
What if multiple displays? Is this possible for user?
> +
> +static irqreturn_t spi_panel_te_handler(int irq, void *data)
> +{
> + complete(&spi_panel_te);
> + return IRQ_HANDLED;
> +}
> +
> +static void set_spi_panel_te_irq_status(struct fbtft_par *par, bool enable)
> +{
> + static int te_irq_count;
Same here. Maybe you can think better way and then this code would also be
cleaner.
> +
> + mutex_lock(&te_mutex);
So locking should be done if we really do action and not just in case.
> +
> + if (enable) {
> + if (++te_irq_count == 1)
> + enable_irq(gpiod_to_irq(par->gpio.te));
> + } else {
> + if (--te_irq_count == 0)
> + disable_irq(gpiod_to_irq(par->gpio.te));
> + }
> + mutex_unlock(&te_mutex);
> +}
> +
> /**
> * init_display() - initialize the display controller
> *
> @@ -82,6 +111,33 @@ enum st7789v_command {
> */
> static int init_display(struct fbtft_par *par)
> {
> + int rc;
> + struct device *dev = par->info->device;
> +
> + par->gpio.te = devm_gpiod_get_index_optional(dev, "te", 0, GPIOD_IN);
> + if (IS_ERR(par->gpio.te)) {
> + rc = PTR_ERR(par->gpio.te);
> + dev_err(par->info->device, "Failed to request te gpio: %d\n", rc);
> + return rc;
> + }
You request with optinal and you still want to error out? We could just
continue and not care about that error. User will be happier if device
still works somehow.
> + if (par->gpio.te) {
> + init_completion(&spi_panel_te);
> + mutex_init(&te_mutex);
> + rc = devm_request_irq(dev,
> + gpiod_to_irq(par->gpio.te),
> + spi_panel_te_handler, IRQF_TRIGGER_RISING,
> + "TE_GPIO", par);
> + if (rc) {
> + dev_err(par->info->device, "TE request_irq failed.\n");
> + devm_gpiod_put(dev, par->gpio.te);
> + return rc;
> + }
> +
> + disable_irq_nosync(gpiod_to_irq(par->gpio.te));
> + } else {
> + dev_info(par->info->device, "%s:%d, TE gpio not specified\n",
> + __func__, __LINE__);
> + }
> /* turn off sleep mode */
> write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
> mdelay(120);
> @@ -137,6 +193,9 @@ static int init_display(struct fbtft_par *par)
> */
> write_reg(par, PWCTRL1, 0xA4, 0xA1);
>
> + /*Tearing Effect Line On*/
Spaces and why upcase everything?
> + if (par->gpio.te)
> + write_reg(par, 0x35, 0x00);
> write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
>
> if (HSD20_IPS)
> @@ -145,6 +204,76 @@ static int init_display(struct fbtft_par *par)
> return 0;
> }
>
> +/*****************************************************************************
> + *
> + * int (*write_vmem)(struct fbtft_par *par);
> + *
> + *****************************************************************************/
> +
Why this kind of function comment? Please use same as another function
comments in this file. They are atleast almoust like kernel-doc style.
> +/* 16 bit pixel over 8-bit databus */
> +static int st7789v_write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len)
> +{
> + u16 *vmem16;
> + __be16 *txbuf16 = par->txbuf.buf;
> + size_t remain;
> + size_t to_copy;
> + size_t tx_array_size;
> + int i;
> + int ret = 0;
> + size_t startbyte_size = 0;
> +
> + fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "st7789v ---%s(offset=%zu, len=%zu)\n",
> + __func__, offset, len);
> +
> + remain = len / 2;
> + vmem16 = (u16 *)(par->info->screen_buffer + offset);
> +
> + if (par->gpio.dc)
> + gpiod_set_value(par->gpio.dc, 1);
> +
> + /* non buffered write */
> + if (!par->txbuf.buf)
> + return par->fbtftops.write(par, vmem16, len);
> +
> + /* buffered write */
> + tx_array_size = par->txbuf.len / 2;
> +
> + if (par->startbyte) {
> + txbuf16 = par->txbuf.buf + 1;
> + tx_array_size -= 2;
> + *(u8 *)(par->txbuf.buf) = par->startbyte | 0x2;
> + startbyte_size = 1;
> + }
> +
> + while (remain) {
for (remain = len / 2; remain; remain -= to_copy) {
or even use len = len / 2 if you wanna save variable.
> + to_copy = min(tx_array_size, remain);
Care must be taken that this will not be endless loop if another is 0. I
will not check this further but hopefully you have.
> + dev_dbg(par->info->device, " to_copy=%zu, remain=%zu\n",
> + to_copy, remain - to_copy);
> +
> + for (i = 0; i < to_copy; i++)
> + txbuf16[i] = cpu_to_be16(vmem16[i]);
> +
> + vmem16 = vmem16 + to_copy;
+= Or you can ++ vmem16 at the for loop but that is not so readable
sometimes with pointers.
> + if (par->gpio.te) {
> + set_spi_panel_te_irq_status(par, true);
> + reinit_completion(&spi_panel_te);
> + ret = wait_for_completion_timeout(&spi_panel_te,
> + msecs_to_jiffies(SPI_PANEL_TE_TIMEOUT));
> + if (ret == 0)
!ret
> + dev_err(par->info->device, "wait panel TE time out\n");
> + }
> + ret = par->fbtftops.write(par, par->txbuf.buf,
> + startbyte_size + to_copy * 2);
> + if (par->gpio.te)
> + set_spi_panel_te_irq_status(par, false);
> + if (ret < 0)
> + return ret;
> + remain -= to_copy;
> + }
> +
> + return ret;
Do we want to return something over 0? If not then this can be return 0.
And then you do not need to even init ret value at the beginning.
Also wait little bit like Greg sayd before sending new version. Someone
might nack about what I say or say something more.
> +}
> +
> /**
> * set_var() - apply LCD properties like rotation and BGR mode
> *
> @@ -259,6 +388,7 @@ static int blank(struct fbtft_par *par, bool on)
> .gamma = HSD20_IPS_GAMMA,
> .fbtftops = {
> .init_display = init_display,
> + .write_vmem = st7789v_write_vmem16_bus8,
> .set_var = set_var,
> .set_gamma = set_gamma,
> .blank = blank,
> diff --git a/drivers/staging/fbtft/fbtft.h b/drivers/staging/fbtft/fbtft.h
> index 76f8c09..93bac05 100644
> --- a/drivers/staging/fbtft/fbtft.h
> +++ b/drivers/staging/fbtft/fbtft.h
> @@ -212,6 +212,7 @@ struct fbtft_par {
> struct gpio_desc *wr;
> struct gpio_desc *latch;
> struct gpio_desc *cs;
> + struct gpio_desc *te;
> struct gpio_desc *db[16];
> struct gpio_desc *led[16];
> struct gpio_desc *aux[16];
> --
> 1.9.1
>
On Thu, 28 Jan 2021 00:32:22 +0200
Kari Argillander <[email protected]> wrote:
> On Wed, Jan 27, 2021 at 09:42:52PM +0800, Carlis wrote:
> > For st7789v ic,when we need continuous full screen refresh, it is
> > best to wait for the TE signal arrive to avoid screen tearing
>
> > diff --git a/drivers/staging/fbtft/fb_st7789v.c
> > b/drivers/staging/fbtft/fb_st7789v.c index 3a280cc..cba08a8 100644
> > --- a/drivers/staging/fbtft/fb_st7789v.c
> > +++ b/drivers/staging/fbtft/fb_st7789v.c
> > @@ -9,9 +9,12 @@
> > #include <linux/delay.h>
> > #include <linux/init.h>
> > #include <linux/kernel.h>
> > +#include <linux/mutex.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/completion.h>
> > #include <linux/module.h>
> > #include <video/mipi_display.h>
> > -
> > +#include <linux/gpio/consumer.h>
>
> Space after local headers. Also this should one up so all Linux
> headers are group together. You agreed?
>
OK,i will fix it in patch v12 tomorrow
> > #include "fbtft.h"
> >
> > #define DRVNAME "fb_st7789v"
> > @@ -66,6 +69,32 @@ enum st7789v_command {
> > #define MADCTL_MX BIT(6) /* bitmask for column address order */
> > #define MADCTL_MY BIT(7) /* bitmask for page address order */
> >
> > +#define SPI_PANEL_TE_TIMEOUT 400 /* msecs */
> > +static struct mutex te_mutex;/* mutex for set te gpio irq status
> > */
>
> Space after ;
hi, i have fix it in the patch v11
>
> > +static struct completion spi_panel_te;
>
> What if multiple displays? Is this possible for user?
I will check it carefully again about this logic.
>
> > +
> > +static irqreturn_t spi_panel_te_handler(int irq, void *data)
> > +{
> > + complete(&spi_panel_te);
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static void set_spi_panel_te_irq_status(struct fbtft_par *par,
> > bool enable) +{
> > + static int te_irq_count;
>
> Same here. Maybe you can think better way and then this code would
> also be cleaner.
>
> > +
> > + mutex_lock(&te_mutex);
>
> So locking should be done if we really do action and not just in case.
>
> > +
> > + if (enable) {
> > + if (++te_irq_count == 1)
> > + enable_irq(gpiod_to_irq(par->gpio.te));
> > + } else {
> > + if (--te_irq_count == 0)
> > + disable_irq(gpiod_to_irq(par->gpio.te));
> > + }
> > + mutex_unlock(&te_mutex);
> > +}
> > +
> > /**
> > * init_display() - initialize the display controller
> > *
> > @@ -82,6 +111,33 @@ enum st7789v_command {
> > */
> > static int init_display(struct fbtft_par *par)
> > {
> > + int rc;
> > + struct device *dev = par->info->device;
> > +
> > + par->gpio.te = devm_gpiod_get_index_optional(dev, "te", 0,
> > GPIOD_IN);
> > + if (IS_ERR(par->gpio.te)) {
> > + rc = PTR_ERR(par->gpio.te);
> > + dev_err(par->info->device, "Failed to request te
> > gpio: %d\n", rc);
> > + return rc;
> > + }
>
> You request with optinal and you still want to error out? We could
> just continue and not care about that error. User will be happier if
> device still works somehow.
You mean i just delete this dev_err print ?!
like this:
par->gpio.te = devm_gpiod_get_index_optional(dev, "te",
0,GPIOD_IN);
if (IS_ERR(par->gpio.te))
return PTR_ERR(par->gpio.te);
>
> > + if (par->gpio.te) {
> > + init_completion(&spi_panel_te);
> > + mutex_init(&te_mutex);
> > + rc = devm_request_irq(dev,
> > + gpiod_to_irq(par->gpio.te),
> > + spi_panel_te_handler,
> > IRQF_TRIGGER_RISING,
> > + "TE_GPIO", par);
> > + if (rc) {
> > + dev_err(par->info->device, "TE request_irq
> > failed.\n");
> > + devm_gpiod_put(dev, par->gpio.te);
> > + return rc;
> > + }
> > +
> > + disable_irq_nosync(gpiod_to_irq(par->gpio.te));
> > + } else {
> > + dev_info(par->info->device, "%s:%d, TE gpio not
> > specified\n",
> > + __func__, __LINE__);
> > + }
> > /* turn off sleep mode */
> > write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
> > mdelay(120);
> > @@ -137,6 +193,9 @@ static int init_display(struct fbtft_par *par)
> > */
> > write_reg(par, PWCTRL1, 0xA4, 0xA1);
> >
> > + /*Tearing Effect Line On*/
>
> Spaces and why upcase everything?
i will fix it in patch v12 tomorrow
>
> > + if (par->gpio.te)
> > + write_reg(par, 0x35, 0x00);
> > write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
> >
> > if (HSD20_IPS)
> > @@ -145,6 +204,76 @@ static int init_display(struct fbtft_par *par)
> > return 0;
> > }
> >
> > +/*****************************************************************************
> > + *
> > + * int (*write_vmem)(struct fbtft_par *par);
> > + *
> > +
> > *****************************************************************************/
> > +
>
> Why this kind of function comment? Please use same as another function
> comments in this file. They are atleast almoust like kernel-doc style.
i will fix it in patch v12 tomorrow
> > +/* 16 bit pixel over 8-bit databus */
> > +static int st7789v_write_vmem16_bus8(struct fbtft_par *par, size_t
> > offset, size_t len) +{
> > + u16 *vmem16;
> > + __be16 *txbuf16 = par->txbuf.buf;
> > + size_t remain;
> > + size_t to_copy;
> > + size_t tx_array_size;
> > + int i;
> > + int ret = 0;
> > + size_t startbyte_size = 0;
> > +
> > + fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "st7789v
> > ---%s(offset=%zu, len=%zu)\n",
> > + __func__, offset, len);
> > +
> > + remain = len / 2;
> > + vmem16 = (u16 *)(par->info->screen_buffer + offset);
> > +
> > + if (par->gpio.dc)
> > + gpiod_set_value(par->gpio.dc, 1);
> > +
> > + /* non buffered write */
> > + if (!par->txbuf.buf)
> > + return par->fbtftops.write(par, vmem16, len);
> > +
> > + /* buffered write */
> > + tx_array_size = par->txbuf.len / 2;
> > +
> > + if (par->startbyte) {
> > + txbuf16 = par->txbuf.buf + 1;
> > + tx_array_size -= 2;
> > + *(u8 *)(par->txbuf.buf) = par->startbyte | 0x2;
> > + startbyte_size = 1;
> > + }
> > +
> > + while (remain) {
>
> for (remain = len / 2; remain; remain -= to_copy) {
>
> or even use len = len / 2 if you wanna save variable.
>
> > + to_copy = min(tx_array_size, remain);
>
> Care must be taken that this will not be endless loop if another is
> 0. I will not check this further but hopefully you have.
>
> > + dev_dbg(par->info->device, " to_copy=%zu,
> > remain=%zu\n",
> > + to_copy, remain - to_copy);
> > +
> > + for (i = 0; i < to_copy; i++)
> > + txbuf16[i] = cpu_to_be16(vmem16[i]);
> > +
> > + vmem16 = vmem16 + to_copy;
>
> += Or you can ++ vmem16 at the for loop but that is not so readable
> sometimes with pointers.
>
> > + if (par->gpio.te) {
> > + set_spi_panel_te_irq_status(par, true);
> > + reinit_completion(&spi_panel_te);
> > + ret =
> > wait_for_completion_timeout(&spi_panel_te,
> > +
> > msecs_to_jiffies(SPI_PANEL_TE_TIMEOUT));
> > + if (ret == 0)
>
> !ret
>
> > + dev_err(par->info->device, "wait
> > panel TE time out\n");
> > + }
> > + ret = par->fbtftops.write(par, par->txbuf.buf,
> > + startbyte_size + to_copy
> > * 2);
> > + if (par->gpio.te)
> > + set_spi_panel_te_irq_status(par, false);
> > + if (ret < 0)
> > + return ret;
> > + remain -= to_copy;
> > + }
> > +
> > + return ret;
>
> Do we want to return something over 0? If not then this can be return
> 0. And then you do not need to even init ret value at the beginning.
>
> Also wait little bit like Greg sayd before sending new version.
> Someone might nack about what I say or say something more.
>
hi, i copy fbtft_write_vmem16_bus8 from file fbtft_bus.c and modify it
,just add te wait logic, i will take more time to check this original
function.
> > +}
> > +
> > /**
> > * set_var() - apply LCD properties like rotation and BGR mode
> > *
> > @@ -259,6 +388,7 @@ static int blank(struct fbtft_par *par, bool on)
> > .gamma = HSD20_IPS_GAMMA,
> > .fbtftops = {
> > .init_display = init_display,
> > + .write_vmem = st7789v_write_vmem16_bus8,
> > .set_var = set_var,
> > .set_gamma = set_gamma,
> > .blank = blank,
> > diff --git a/drivers/staging/fbtft/fbtft.h
> > b/drivers/staging/fbtft/fbtft.h index 76f8c09..93bac05 100644
> > --- a/drivers/staging/fbtft/fbtft.h
> > +++ b/drivers/staging/fbtft/fbtft.h
> > @@ -212,6 +212,7 @@ struct fbtft_par {
> > struct gpio_desc *wr;
> > struct gpio_desc *latch;
> > struct gpio_desc *cs;
> > + struct gpio_desc *te;
> > struct gpio_desc *db[16];
> > struct gpio_desc *led[16];
> > struct gpio_desc *aux[16];
> > --
> > 1.9.1
> >
On Thu, Jan 28, 2021 at 09:42:58AM +0800, carlis wrote:
> On Thu, 28 Jan 2021 00:32:22 +0200
> Kari Argillander <[email protected]> wrote:
> > > #include "fbtft.h"
> > >
> > > #define DRVNAME "fb_st7789v"
> > > @@ -66,6 +69,32 @@ enum st7789v_command {
> > > #define MADCTL_MX BIT(6) /* bitmask for column address order */
> > > #define MADCTL_MY BIT(7) /* bitmask for page address order */
> > >
> > > +#define SPI_PANEL_TE_TIMEOUT 400 /* msecs */
> > > +static struct mutex te_mutex;/* mutex for set te gpio irq status
> > > */
> >
> > Space after ;
> hi, i have fix it in the patch v11
> >
Yeah sorry. I accidentally review wrong patch. But mostly stuff are
still relevant.
> > > @@ -82,6 +111,33 @@ enum st7789v_command {
> > > */
> > > static int init_display(struct fbtft_par *par)
> > > {
> > > + int rc;
> > > + struct device *dev = par->info->device;
> > > +
> > > + par->gpio.te = devm_gpiod_get_index_optional(dev, "te", 0,
> > > GPIOD_IN);
> > > + if (IS_ERR(par->gpio.te)) {
> > > + rc = PTR_ERR(par->gpio.te);
> > > + dev_err(par->info->device, "Failed to request te
> > > gpio: %d\n", rc);
> > > + return rc;
> > > + }
> >
> > You request with optinal and you still want to error out? We could
> > just continue and not care about that error. User will be happier if
> > device still works somehow.
> You mean i just delete this dev_err print ?!
> like this:
> par->gpio.te = devm_gpiod_get_index_optional(dev, "te",
> 0,GPIOD_IN);
> if (IS_ERR(par->gpio.te))
> return PTR_ERR(par->gpio.te);
Not exactly. I'm suggesting something like this.
if (IS_ERR(par->gpio.te) == -EPROBE_DEFER) {
return -EPROBE_DEFER;
if (IS_ERR(par->gpio.te))
par-gpio.te = NULL;
This like beginning of your patch series but the difference is that if
EPROBE_DEFER then we will try again later. Any other error and we will
just ignore TE gpio. But this is up to you what you want to do. To me
this just seems place where this kind of logic can work.
> > > + if (par->gpio.te) {
> > > + set_spi_panel_te_irq_status(par, true);
> > > + reinit_completion(&spi_panel_te);
> > > + ret =
> > > wait_for_completion_timeout(&spi_panel_te,
> > > +
> > > msecs_to_jiffies(SPI_PANEL_TE_TIMEOUT));
> > > + if (ret == 0)
> >
> > !ret
> >
> > > + dev_err(par->info->device, "wait
> > > panel TE time out\n");
> > > + }
> > > + ret = par->fbtftops.write(par, par->txbuf.buf,
> > > + startbyte_size + to_copy
> > > * 2);
> > > + if (par->gpio.te)
> > > + set_spi_panel_te_irq_status(par, false);
> > > + if (ret < 0)
> > > + return ret;
> > > + remain -= to_copy;
> > > + }
> > > +
> > > + return ret;
> >
> > Do we want to return something over 0? If not then this can be return
> > 0. And then you do not need to even init ret value at the beginning.
> >
> > Also wait little bit like Greg sayd before sending new version.
> > Someone might nack about what I say or say something more.
> >
> hi, i copy fbtft_write_vmem16_bus8 from file fbtft_bus.c and modify it
> ,just add te wait logic, i will take more time to check this original
> function.
It might be ok or not. You should still check.
On Thu, 28 Jan 2021 08:52:33 +0200
Kari Argillander <[email protected]> wrote:
> On Thu, Jan 28, 2021 at 09:42:58AM +0800, carlis wrote:
> > On Thu, 28 Jan 2021 00:32:22 +0200
> > Kari Argillander <[email protected]> wrote:
> > > > #include "fbtft.h"
> > > >
> > > > #define DRVNAME "fb_st7789v"
> > > > @@ -66,6 +69,32 @@ enum st7789v_command {
> > > > #define MADCTL_MX BIT(6) /* bitmask for column address order */
> > > > #define MADCTL_MY BIT(7) /* bitmask for page address order */
> > > >
> > > > +#define SPI_PANEL_TE_TIMEOUT 400 /* msecs */
> > > > +static struct mutex te_mutex;/* mutex for set te gpio irq
> > > > status */
> > >
> > > Space after ;
> > hi, i have fix it in the patch v11
> > >
>
> Yeah sorry. I accidentally review wrong patch. But mostly stuff are
> still relevant.
>
> > > > @@ -82,6 +111,33 @@ enum st7789v_command {
> > > > */
> > > > static int init_display(struct fbtft_par *par)
> > > > {
> > > > + int rc;
> > > > + struct device *dev = par->info->device;
> > > > +
> > > > + par->gpio.te = devm_gpiod_get_index_optional(dev,
> > > > "te", 0, GPIOD_IN);
> > > > + if (IS_ERR(par->gpio.te)) {
> > > > + rc = PTR_ERR(par->gpio.te);
> > > > + dev_err(par->info->device, "Failed to request
> > > > te gpio: %d\n", rc);
> > > > + return rc;
> > > > + }
> > >
> > > You request with optinal and you still want to error out? We could
> > > just continue and not care about that error. User will be happier
> > > if device still works somehow.
> > You mean i just delete this dev_err print ?!
> > like this:
> > par->gpio.te = devm_gpiod_get_index_optional(dev, "te",
> > 0,GPIOD_IN);
> > if (IS_ERR(par->gpio.te))
> > return PTR_ERR(par->gpio.te);
>
> Not exactly. I'm suggesting something like this.
>
> if (IS_ERR(par->gpio.te) == -EPROBE_DEFER) {
> return -EPROBE_DEFER;
>
> if (IS_ERR(par->gpio.te))
> par-gpio.te = NULL;
>
> This like beginning of your patch series but the difference is that if
> EPROBE_DEFER then we will try again later. Any other error and we will
> just ignore TE gpio. But this is up to you what you want to do. To me
> this just seems place where this kind of logic can work.
>
> > > > + if (par->gpio.te) {
> > > > + set_spi_panel_te_irq_status(par, true);
> > > > + reinit_completion(&spi_panel_te);
> > > > + ret =
> > > > wait_for_completion_timeout(&spi_panel_te,
> > > > +
> > > > msecs_to_jiffies(SPI_PANEL_TE_TIMEOUT));
> > > > + if (ret == 0)
> > >
> > > !ret
> > >
> > > > + dev_err(par->info->device,
> > > > "wait panel TE time out\n");
> > > > + }
> > > > + ret = par->fbtftops.write(par, par->txbuf.buf,
> > > > + startbyte_size +
> > > > to_copy
> > > > * 2);
> > > > + if (par->gpio.te)
> > > > + set_spi_panel_te_irq_status(par,
> > > > false);
> > > > + if (ret < 0)
> > > > + return ret;
> > > > + remain -= to_copy;
> > > > + }
> > > > +
> > > > + return ret;
> > >
> > > Do we want to return something over 0? If not then this can be
> > > return 0. And then you do not need to even init ret value at the
> > > beginning.
> > >
> > > Also wait little bit like Greg sayd before sending new version.
> > > Someone might nack about what I say or say something more.
> > >
> > hi, i copy fbtft_write_vmem16_bus8 from file fbtft_bus.c and modify
> > it ,just add te wait logic, i will take more time to check this
> > original function.
>
> It might be ok or not. You should still check.
hi, i will check more carefully, now i have a new problem, Is there a
way to clear the interrupt pending state before opening it again?
Hi Kari,
On Thu, Jan 28, 2021 at 7:53 AM Kari Argillander
<[email protected]> wrote:
> On Thu, Jan 28, 2021 at 09:42:58AM +0800, carlis wrote:
> > On Thu, 28 Jan 2021 00:32:22 +0200
> > Kari Argillander <[email protected]> wrote:
> > > > #include "fbtft.h"
> > > >
> > > > #define DRVNAME "fb_st7789v"
> > > > @@ -66,6 +69,32 @@ enum st7789v_command {
> > > > #define MADCTL_MX BIT(6) /* bitmask for column address order */
> > > > #define MADCTL_MY BIT(7) /* bitmask for page address order */
> > > >
> > > > +#define SPI_PANEL_TE_TIMEOUT 400 /* msecs */
> > > > +static struct mutex te_mutex;/* mutex for set te gpio irq status
> > > > */
> > >
> > > Space after ;
> > hi, i have fix it in the patch v11
> > >
>
> Yeah sorry. I accidentally review wrong patch. But mostly stuff are
> still relevant.
>
> > > > @@ -82,6 +111,33 @@ enum st7789v_command {
> > > > */
> > > > static int init_display(struct fbtft_par *par)
> > > > {
> > > > + int rc;
> > > > + struct device *dev = par->info->device;
> > > > +
> > > > + par->gpio.te = devm_gpiod_get_index_optional(dev, "te", 0,
> > > > GPIOD_IN);
> > > > + if (IS_ERR(par->gpio.te)) {
> > > > + rc = PTR_ERR(par->gpio.te);
> > > > + dev_err(par->info->device, "Failed to request te
> > > > gpio: %d\n", rc);
> > > > + return rc;
> > > > + }
> > >
> > > You request with optinal and you still want to error out? We could
> > > just continue and not care about that error. User will be happier if
> > > device still works somehow.
devm_gpiod_get_index_optional() returns NULL, not an error, if the
GPIO is not found. So if IS_ERR() is the right check.
And checks for -EPROBE_DEFER can be handled automatically
by using dev_err_probe() instead of dev_err().
> > You mean i just delete this dev_err print ?!
> > like this:
> > par->gpio.te = devm_gpiod_get_index_optional(dev, "te",
> > 0,GPIOD_IN);
> > if (IS_ERR(par->gpio.te))
> > return PTR_ERR(par->gpio.te);
>
> Not exactly. I'm suggesting something like this.
>
> if (IS_ERR(par->gpio.te) == -EPROBE_DEFER) {
> return -EPROBE_DEFER;
>
> if (IS_ERR(par->gpio.te))
> par-gpio.te = NULL;
>
> This like beginning of your patch series but the difference is that if
> EPROBE_DEFER then we will try again later. Any other error and we will
> just ignore TE gpio. But this is up to you what you want to do. To me
> this just seems place where this kind of logic can work.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
On Thu, Jan 28, 2021 at 10:42:54AM +0100, Geert Uytterhoeven wrote:
> Hi Kari,
>
> On Thu, Jan 28, 2021 at 7:53 AM Kari Argillander
> <[email protected]> wrote:
> > On Thu, Jan 28, 2021 at 09:42:58AM +0800, carlis wrote:
> > > On Thu, 28 Jan 2021 00:32:22 +0200
> > > Kari Argillander <[email protected]> wrote:
> > > > > @@ -82,6 +111,33 @@ enum st7789v_command {
> > > > > */
> > > > > static int init_display(struct fbtft_par *par)
> > > > > {
> > > > > + int rc;
> > > > > + struct device *dev = par->info->device;
> > > > > +
> > > > > + par->gpio.te = devm_gpiod_get_index_optional(dev, "te", 0,
> > > > > GPIOD_IN);
> > > > > + if (IS_ERR(par->gpio.te)) {
> > > > > + rc = PTR_ERR(par->gpio.te);
> > > > > + dev_err(par->info->device, "Failed to request te
> > > > > gpio: %d\n", rc);
> > > > > + return rc;
> > > > > + }
> > > >
> > > > You request with optinal and you still want to error out? We could
> > > > just continue and not care about that error. User will be happier if
> > > > device still works somehow.
>
> devm_gpiod_get_index_optional() returns NULL, not an error, if the
> GPIO is not found. So if IS_ERR() is the right check.
>
> And checks for -EPROBE_DEFER can be handled automatically
> by using dev_err_probe() instead of dev_err().
Yeah. Thanks for pointing that clearly.
> > > You mean i just delete this dev_err print ?!
> > > like this:
> > > par->gpio.te = devm_gpiod_get_index_optional(dev, "te",
> > > 0,GPIOD_IN);
> > > if (IS_ERR(par->gpio.te))
> > > return PTR_ERR(par->gpio.te);
> >
> > Not exactly. I'm suggesting something like this.
> >
> > if (IS_ERR(par->gpio.te) == -EPROBE_DEFER) {
> > return -EPROBE_DEFER;
> >
> > if (IS_ERR(par->gpio.te))
> > par-gpio.te = NULL;
> >
> > This like beginning of your patch series but the difference is that if
> > EPROBE_DEFER then we will try again later. Any other error and we will
> > just ignore TE gpio. But this is up to you what you want to do. To me
> > this just seems place where this kind of logic can work.
On Thu, 28 Jan 2021 10:42:54 +0100
Geert Uytterhoeven <[email protected]> wrote:
> Hi Kari,
>
> On Thu, Jan 28, 2021 at 7:53 AM Kari Argillander
> <[email protected]> wrote:
> > On Thu, Jan 28, 2021 at 09:42:58AM +0800, carlis wrote:
> > > On Thu, 28 Jan 2021 00:32:22 +0200
> > > Kari Argillander <[email protected]> wrote:
> > > > > #include "fbtft.h"
> > > > >
> > > > > #define DRVNAME "fb_st7789v"
> > > > > @@ -66,6 +69,32 @@ enum st7789v_command {
> > > > > #define MADCTL_MX BIT(6) /* bitmask for column address order
> > > > > */ #define MADCTL_MY BIT(7) /* bitmask for page address order
> > > > > */
> > > > >
> > > > > +#define SPI_PANEL_TE_TIMEOUT 400 /* msecs */
> > > > > +static struct mutex te_mutex;/* mutex for set te gpio irq
> > > > > status */
> > > >
> > > > Space after ;
> > > hi, i have fix it in the patch v11
> > > >
> >
> > Yeah sorry. I accidentally review wrong patch. But mostly stuff are
> > still relevant.
> >
> > > > > @@ -82,6 +111,33 @@ enum st7789v_command {
> > > > > */
> > > > > static int init_display(struct fbtft_par *par)
> > > > > {
> > > > > + int rc;
> > > > > + struct device *dev = par->info->device;
> > > > > +
> > > > > + par->gpio.te = devm_gpiod_get_index_optional(dev, "te", 0,
> > > > > GPIOD_IN);
> > > > > + if (IS_ERR(par->gpio.te)) {
> > > > > + rc = PTR_ERR(par->gpio.te);
> > > > > + dev_err(par->info->device, "Failed to request te
> > > > > gpio: %d\n", rc);
> > > > > + return rc;
> > > > > + }
> > > >
> > > > You request with optinal and you still want to error out? We
> > > > could just continue and not care about that error. User will be
> > > > happier if device still works somehow.
>
> devm_gpiod_get_index_optional() returns NULL, not an error, if the
> GPIO is not found. So if IS_ERR() is the right check.
>
> And checks for -EPROBE_DEFER can be handled automatically
> by using dev_err_probe() instead of dev_err().
>
hi, i fix it like below!?
par->gpio.te = devm_gpiod_get_index_optional(dev, "te", 0,
GPIOD_IN); if (IS_ERR(par->gpio.te)) {
rc = PTR_ERR(par->gpio.te);
dev_err_probe(par->info->device, rc, "Failed to request
te gpio\n"); return rc;
}
if (par->gpio.te) {
init_completion(&spi_panel_te);
rc = devm_request_irq(dev,
gpiod_to_irq(par->gpio.te),
spi_panel_te_handler,
IRQF_TRIGGER_RISING, "TE_GPIO", par);
if (rc) {
dev_err(par->info->device, "TE request_irq
failed.\n"); return rc;
}
disable_irq_nosync(gpiod_to_irq(par->gpio.te));
} else {
dev_info(par->info->device, "%s:%d, TE gpio not
specified\n", __func__, __LINE__);
}
> > > You mean i just delete this dev_err print ?!
> > > like this:
> > > par->gpio.te = devm_gpiod_get_index_optional(dev, "te",
> > > 0,GPIOD_IN);
> > > if (IS_ERR(par->gpio.te))
> > > return PTR_ERR(par->gpio.te);
> >
> > Not exactly. I'm suggesting something like this.
> >
> > if (IS_ERR(par->gpio.te) == -EPROBE_DEFER) {
> > return -EPROBE_DEFER;
> >
> > if (IS_ERR(par->gpio.te))
> > par-gpio.te = NULL;
> >
> > This like beginning of your patch series but the difference is that
> > if EPROBE_DEFER then we will try again later. Any other error and
> > we will just ignore TE gpio. But this is up to you what you want to
> > do. To me this just seems place where this kind of logic can work.
>
> Gr{oetje,eeting}s,
>
> Geert
>
regards,
zhangxuezhi
Hi Carlis,
On Thu, Jan 28, 2021 at 12:03 PM carlis <[email protected]> wrote:
> On Thu, 28 Jan 2021 10:42:54 +0100
> Geert Uytterhoeven <[email protected]> wrote:
> > On Thu, Jan 28, 2021 at 7:53 AM Kari Argillander
> > <[email protected]> wrote:
> > > On Thu, Jan 28, 2021 at 09:42:58AM +0800, carlis wrote:
> > > > On Thu, 28 Jan 2021 00:32:22 +0200
> > > > Kari Argillander <[email protected]> wrote:
> > > > > > #include "fbtft.h"
> > > > > >
> > > > > > #define DRVNAME "fb_st7789v"
> > > > > > @@ -66,6 +69,32 @@ enum st7789v_command {
> > > > > > #define MADCTL_MX BIT(6) /* bitmask for column address order
> > > > > > */ #define MADCTL_MY BIT(7) /* bitmask for page address order
> > > > > > */
> > > > > >
> > > > > > +#define SPI_PANEL_TE_TIMEOUT 400 /* msecs */
> > > > > > +static struct mutex te_mutex;/* mutex for set te gpio irq
> > > > > > status */
> > > > >
> > > > > Space after ;
> > > > hi, i have fix it in the patch v11
> > > > >
> > >
> > > Yeah sorry. I accidentally review wrong patch. But mostly stuff are
> > > still relevant.
> > >
> > > > > > @@ -82,6 +111,33 @@ enum st7789v_command {
> > > > > > */
> > > > > > static int init_display(struct fbtft_par *par)
> > > > > > {
> > > > > > + int rc;
> > > > > > + struct device *dev = par->info->device;
> > > > > > +
> > > > > > + par->gpio.te = devm_gpiod_get_index_optional(dev, "te", 0,
> > > > > > GPIOD_IN);
> > > > > > + if (IS_ERR(par->gpio.te)) {
> > > > > > + rc = PTR_ERR(par->gpio.te);
> > > > > > + dev_err(par->info->device, "Failed to request te
> > > > > > gpio: %d\n", rc);
> > > > > > + return rc;
> > > > > > + }
> > > > >
> > > > > You request with optinal and you still want to error out? We
> > > > > could just continue and not care about that error. User will be
> > > > > happier if device still works somehow.
> >
> > devm_gpiod_get_index_optional() returns NULL, not an error, if the
> > GPIO is not found. So if IS_ERR() is the right check.
> >
> > And checks for -EPROBE_DEFER can be handled automatically
> > by using dev_err_probe() instead of dev_err().
> >
> hi, i fix it like below!?
> par->gpio.te = devm_gpiod_get_index_optional(dev, "te", 0,
> GPIOD_IN); if (IS_ERR(par->gpio.te)) {
> rc = PTR_ERR(par->gpio.te);
> dev_err_probe(par->info->device, rc, "Failed to request
> te gpio\n"); return rc;
> }
> if (par->gpio.te) {
> init_completion(&spi_panel_te);
> rc = devm_request_irq(dev,
> gpiod_to_irq(par->gpio.te),
> spi_panel_te_handler,
> IRQF_TRIGGER_RISING, "TE_GPIO", par);
> if (rc) {
> dev_err(par->info->device, "TE request_irq
> failed.\n"); return rc;
dev_err_probe()
> }
>
> disable_irq_nosync(gpiod_to_irq(par->gpio.te));
> } else {
> dev_info(par->info->device, "%s:%d, TE gpio not
> specified\n", __func__, __LINE__);
> }
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
On Thu, 28 Jan 2021 12:15:28 +0100
Geert Uytterhoeven <[email protected]> wrote:
> Hi Carlis,
>
> On Thu, Jan 28, 2021 at 12:03 PM carlis <[email protected]>
> wrote:
> > On Thu, 28 Jan 2021 10:42:54 +0100
> > Geert Uytterhoeven <[email protected]> wrote:
> > > On Thu, Jan 28, 2021 at 7:53 AM Kari Argillander
> > > <[email protected]> wrote:
> > > > On Thu, Jan 28, 2021 at 09:42:58AM +0800, carlis wrote:
> > > > > On Thu, 28 Jan 2021 00:32:22 +0200
> > > > > Kari Argillander <[email protected]> wrote:
> > > > > > > #include "fbtft.h"
> > > > > > >
> > > > > > > #define DRVNAME "fb_st7789v"
> > > > > > > @@ -66,6 +69,32 @@ enum st7789v_command {
> > > > > > > #define MADCTL_MX BIT(6) /* bitmask for column address
> > > > > > > order */ #define MADCTL_MY BIT(7) /* bitmask for page
> > > > > > > address order */
> > > > > > >
> > > > > > > +#define SPI_PANEL_TE_TIMEOUT 400 /* msecs */
> > > > > > > +static struct mutex te_mutex;/* mutex for set te gpio irq
> > > > > > > status */
> > > > > >
> > > > > > Space after ;
> > > > > hi, i have fix it in the patch v11
> > > > > >
> > > >
> > > > Yeah sorry. I accidentally review wrong patch. But mostly stuff
> > > > are still relevant.
> > > >
> > > > > > > @@ -82,6 +111,33 @@ enum st7789v_command {
> > > > > > > */
> > > > > > > static int init_display(struct fbtft_par *par)
> > > > > > > {
> > > > > > > + int rc;
> > > > > > > + struct device *dev = par->info->device;
> > > > > > > +
> > > > > > > + par->gpio.te = devm_gpiod_get_index_optional(dev, "te",
> > > > > > > 0, GPIOD_IN);
> > > > > > > + if (IS_ERR(par->gpio.te)) {
> > > > > > > + rc = PTR_ERR(par->gpio.te);
> > > > > > > + dev_err(par->info->device, "Failed to request te
> > > > > > > gpio: %d\n", rc);
> > > > > > > + return rc;
> > > > > > > + }
> > > > > >
> > > > > > You request with optinal and you still want to error out? We
> > > > > > could just continue and not care about that error. User
> > > > > > will be happier if device still works somehow.
> > >
> > > devm_gpiod_get_index_optional() returns NULL, not an error, if the
> > > GPIO is not found. So if IS_ERR() is the right check.
> > >
> > > And checks for -EPROBE_DEFER can be handled automatically
> > > by using dev_err_probe() instead of dev_err().
> > >
> > hi, i fix it like below!?
> > par->gpio.te = devm_gpiod_get_index_optional(dev, "te", 0,
> > GPIOD_IN); if (IS_ERR(par->gpio.te)) {
> > rc = PTR_ERR(par->gpio.te);
> > dev_err_probe(par->info->device, rc, "Failed to
> > request te gpio\n"); return rc;
> > }
> > if (par->gpio.te) {
> > init_completion(&spi_panel_te);
> > rc = devm_request_irq(dev,
> > gpiod_to_irq(par->gpio.te),
> > spi_panel_te_handler,
> > IRQF_TRIGGER_RISING, "TE_GPIO", par);
> > if (rc) {
> > dev_err(par->info->device, "TE request_irq
> > failed.\n"); return rc;
>
> dev_err_probe()
>
> > }
> >
> > disable_irq_nosync(gpiod_to_irq(par->gpio.te));
> > } else {
> > dev_info(par->info->device, "%s:%d, TE gpio not
> > specified\n", __func__, __LINE__);
> > }
>
> Gr{oetje,eeting}s,
>
> Geert
>
hi,i will fix it like below:
par->gpio.te = devm_gpiod_get_index_optional(dev, "te", 0,
GPIOD_IN); if (IS_ERR(par->gpio.te))
return dev_err_probe(par->info->device,
PTR_ERR(par->gpio.te), "Failed to request te gpio\n");
if (par->gpio.te) {
init_completion(&spi_panel_te);
rc = devm_request_irq(dev,
gpiod_to_irq(par->gpio.te),
spi_panel_te_handler,
IRQF_TRIGGER_RISING, "TE_GPIO", par);
if (IS_ERR(rc))
return dev_err_probe(par->info->device,
PTR_ERR(rc), "TE request_irq failed.\n");
disable_irq_nosync(gpiod_to_irq(par->gpio.te));
} else {
dev_info(par->info->device, "%s:%d, TE gpio not
specified\n", __func__, __LINE__);
}
regards,
zhangxuezhi
On Thu, Jan 28, 2021 at 12:32:22AM +0200, Kari Argillander wrote:
> On Wed, Jan 27, 2021 at 09:42:52PM +0800, Carlis wrote:
> > @@ -82,6 +111,33 @@ enum st7789v_command {
> > */
> > static int init_display(struct fbtft_par *par)
> > {
> > + int rc;
> > + struct device *dev = par->info->device;
> > +
> > + par->gpio.te = devm_gpiod_get_index_optional(dev, "te", 0, GPIOD_IN);
> > + if (IS_ERR(par->gpio.te)) {
> > + rc = PTR_ERR(par->gpio.te);
> > + dev_err(par->info->device, "Failed to request te gpio: %d\n", rc);
> > + return rc;
> > + }
>
> You request with optinal and you still want to error out? We could just
> continue and not care about that error. User will be happier if device
> still works somehow.
>
Carlis tried that approach in previous versions. See the discussion
about -EPROBEi_DEFER.
That's not the right way to think about it anyway. It's optional but
the user *chose* to enable it so if an error occurs then it's still an
error and should be treated like an error. The user should fix the
error or disable the feature if they want to continue.
There are lots of places in the kernel where the error handling could
be written to try continue but in a crippled state. It's not the right
approach. Over engineering like that just leads to bugs.
regards,
dan carpenter