While working on supporting the Intel HDR backlight interface, I noticed
that there's a couple of laptops that will very rarely manage to boot up
without detecting Intel HDR backlight support - even though it's supported
on the system. One example of such a laptop is the Lenovo P17 1st
generation.
Following some investigation Ville Syrjälä did through the docs they have
available to them, they discovered that there's actually supposed to be a
30ms wait after writing the source OUI before we begin setting up the rest
of the backlight interface.
This seems to be correct, as adding this 30ms delay seems to have
completely fixed the probing issues I was previously seeing. So - let's
start performing a 30ms wait after writing the OUI, which we do in a manner
similar to how we keep track of PPS delays (e.g. record the timestamp of
the OUI write, and then wait for however many ms are left since that
timestamp right before we interact with the backlight) in order to avoid
waiting any longer then we need to. As well, this also avoids us performing
this delay on systems where we don't end up using the HDR backlight
interface.
Signed-off-by: Lyude Paul <[email protected]>
Fixes: 4a8d79901d5b ("drm/i915/dp: Enable Intel's HDR backlight interface (only SDR for now)")
Cc: Ville Syrjälä <[email protected]>
Cc: <[email protected]> # v5.12+
---
drivers/gpu/drm/i915/display/intel_display_types.h | 3 +++
drivers/gpu/drm/i915/display/intel_dp.c | 3 +++
drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 11 +++++++++++
3 files changed, 17 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index ea1e8a6e10b0..b9c967837872 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1653,6 +1653,9 @@ struct intel_dp {
struct intel_dp_pcon_frl frl;
struct intel_psr psr;
+
+ /* When we last wrote the OUI for eDP */
+ unsigned long last_oui_write;
};
enum lspcon_vendor {
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 0a424bf69396..77d9a9390c1e 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -29,6 +29,7 @@
#include <linux/i2c.h>
#include <linux/notifier.h>
#include <linux/slab.h>
+#include <linux/timekeeping.h>
#include <linux/types.h>
#include <asm/byteorder.h>
@@ -2010,6 +2011,8 @@ intel_edp_init_source_oui(struct intel_dp *intel_dp, bool careful)
if (drm_dp_dpcd_write(&intel_dp->aux, DP_SOURCE_OUI, oui, sizeof(oui)) < 0)
drm_err(&i915->drm, "Failed to write source OUI\n");
+
+ intel_dp->last_oui_write = jiffies;
}
/* If the device supports it, try to set the power state appropriately */
diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
index 569d17b4d00f..2c35b999ec2c 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
@@ -96,6 +96,13 @@
#define INTEL_EDP_BRIGHTNESS_OPTIMIZATION_1 0x359
/* Intel EDP backlight callbacks */
+static void
+wait_for_oui(struct drm_i915_private *i915, struct intel_dp *intel_dp)
+{
+ drm_dbg_kms(&i915->drm, "Performing OUI wait\n");
+ wait_remaining_ms_from_jiffies(intel_dp->last_oui_write, 30);
+}
+
static bool
intel_dp_aux_supports_hdr_backlight(struct intel_connector *connector)
{
@@ -106,6 +113,8 @@ intel_dp_aux_supports_hdr_backlight(struct intel_connector *connector)
int ret;
u8 tcon_cap[4];
+ wait_for_oui(i915, intel_dp);
+
ret = drm_dp_dpcd_read(aux, INTEL_EDP_HDR_TCON_CAP0, tcon_cap, sizeof(tcon_cap));
if (ret != sizeof(tcon_cap))
return false;
@@ -204,6 +213,8 @@ intel_dp_aux_hdr_enable_backlight(const struct intel_crtc_state *crtc_state,
int ret;
u8 old_ctrl, ctrl;
+ wait_for_oui(i915, intel_dp);
+
ret = drm_dp_dpcd_readb(&intel_dp->aux, INTEL_EDP_HDR_GETSET_CTRL_PARAMS, &old_ctrl);
if (ret != 1) {
drm_err(&i915->drm, "Failed to read current backlight control mode: %d\n", ret);
--
2.31.1
On Fri, 12 Nov 2021, Lyude Paul <[email protected]> wrote:
> While working on supporting the Intel HDR backlight interface, I noticed
> that there's a couple of laptops that will very rarely manage to boot up
> without detecting Intel HDR backlight support - even though it's supported
> on the system. One example of such a laptop is the Lenovo P17 1st
> generation.
>
> Following some investigation Ville Syrjälä did through the docs they have
> available to them, they discovered that there's actually supposed to be a
> 30ms wait after writing the source OUI before we begin setting up the rest
> of the backlight interface.
>
> This seems to be correct, as adding this 30ms delay seems to have
> completely fixed the probing issues I was previously seeing. So - let's
> start performing a 30ms wait after writing the OUI, which we do in a manner
> similar to how we keep track of PPS delays (e.g. record the timestamp of
> the OUI write, and then wait for however many ms are left since that
> timestamp right before we interact with the backlight) in order to avoid
> waiting any longer then we need to. As well, this also avoids us performing
> this delay on systems where we don't end up using the HDR backlight
> interface.
Ugh. Thanks for digging into this.
The only thing that I dislike with the implementation is splitting the
implementation to two places. See how well we've managed to shove all of
the PPS waits inside intel_pps.c. Almost all of intel_dp->pps is managed
within intel_pps.c.
I think I'd actually add a intel_dp_wait_source_oui() or something in
intel_dp.c, so all of the details about source OUI and
intel_dp->last_oui_write access would be localized.
BR,
Jani.
>
> Signed-off-by: Lyude Paul <[email protected]>
> Fixes: 4a8d79901d5b ("drm/i915/dp: Enable Intel's HDR backlight interface (only SDR for now)")
> Cc: Ville Syrjälä <[email protected]>
> Cc: <[email protected]> # v5.12+
> ---
> drivers/gpu/drm/i915/display/intel_display_types.h | 3 +++
> drivers/gpu/drm/i915/display/intel_dp.c | 3 +++
> drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 11 +++++++++++
> 3 files changed, 17 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> index ea1e8a6e10b0..b9c967837872 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -1653,6 +1653,9 @@ struct intel_dp {
> struct intel_dp_pcon_frl frl;
>
> struct intel_psr psr;
> +
> + /* When we last wrote the OUI for eDP */
> + unsigned long last_oui_write;
> };
>
> enum lspcon_vendor {
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 0a424bf69396..77d9a9390c1e 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -29,6 +29,7 @@
> #include <linux/i2c.h>
> #include <linux/notifier.h>
> #include <linux/slab.h>
> +#include <linux/timekeeping.h>
> #include <linux/types.h>
>
> #include <asm/byteorder.h>
> @@ -2010,6 +2011,8 @@ intel_edp_init_source_oui(struct intel_dp *intel_dp, bool careful)
>
> if (drm_dp_dpcd_write(&intel_dp->aux, DP_SOURCE_OUI, oui, sizeof(oui)) < 0)
> drm_err(&i915->drm, "Failed to write source OUI\n");
> +
> + intel_dp->last_oui_write = jiffies;
> }
>
> /* If the device supports it, try to set the power state appropriately */
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> index 569d17b4d00f..2c35b999ec2c 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> @@ -96,6 +96,13 @@
> #define INTEL_EDP_BRIGHTNESS_OPTIMIZATION_1 0x359
>
> /* Intel EDP backlight callbacks */
> +static void
> +wait_for_oui(struct drm_i915_private *i915, struct intel_dp *intel_dp)
> +{
> + drm_dbg_kms(&i915->drm, "Performing OUI wait\n");
> + wait_remaining_ms_from_jiffies(intel_dp->last_oui_write, 30);
> +}
> +
> static bool
> intel_dp_aux_supports_hdr_backlight(struct intel_connector *connector)
> {
> @@ -106,6 +113,8 @@ intel_dp_aux_supports_hdr_backlight(struct intel_connector *connector)
> int ret;
> u8 tcon_cap[4];
>
> + wait_for_oui(i915, intel_dp);
> +
> ret = drm_dp_dpcd_read(aux, INTEL_EDP_HDR_TCON_CAP0, tcon_cap, sizeof(tcon_cap));
> if (ret != sizeof(tcon_cap))
> return false;
> @@ -204,6 +213,8 @@ intel_dp_aux_hdr_enable_backlight(const struct intel_crtc_state *crtc_state,
> int ret;
> u8 old_ctrl, ctrl;
>
> + wait_for_oui(i915, intel_dp);
> +
> ret = drm_dp_dpcd_readb(&intel_dp->aux, INTEL_EDP_HDR_GETSET_CTRL_PARAMS, &old_ctrl);
> if (ret != 1) {
> drm_err(&i915->drm, "Failed to read current backlight control mode: %d\n", ret);
--
Jani Nikula, Intel Open Source Graphics Center
On Mon, 2021-11-15 at 12:53 +0200, Jani Nikula wrote:
> On Fri, 12 Nov 2021, Lyude Paul <[email protected]> wrote:
> > While working on supporting the Intel HDR backlight interface, I noticed
> > that there's a couple of laptops that will very rarely manage to boot up
> > without detecting Intel HDR backlight support - even though it's supported
> > on the system. One example of such a laptop is the Lenovo P17 1st
> > generation.
> >
> > Following some investigation Ville Syrjälä did through the docs they have
> > available to them, they discovered that there's actually supposed to be a
> > 30ms wait after writing the source OUI before we begin setting up the rest
> > of the backlight interface.
> >
> > This seems to be correct, as adding this 30ms delay seems to have
> > completely fixed the probing issues I was previously seeing. So - let's
> > start performing a 30ms wait after writing the OUI, which we do in a
> > manner
> > similar to how we keep track of PPS delays (e.g. record the timestamp of
> > the OUI write, and then wait for however many ms are left since that
> > timestamp right before we interact with the backlight) in order to avoid
> > waiting any longer then we need to. As well, this also avoids us
> > performing
> > this delay on systems where we don't end up using the HDR backlight
> > interface.
>
> Ugh. Thanks for digging into this.
haha, np! You should thank Ville for finding the hidden docs that told us
about this :).
>
> The only thing that I dislike with the implementation is splitting the
> implementation to two places. See how well we've managed to shove all of
> the PPS waits inside intel_pps.c. Almost all of intel_dp->pps is managed
> within intel_pps.c.
gotcha, I think I meant to do this after I got things working but forgot
before I sent this out, will respin ASAP
>
> I think I'd actually add a intel_dp_wait_source_oui() or something in
> intel_dp.c, so all of the details about source OUI and
> intel_dp->last_oui_write access would be localized.
>
>
> BR,
> Jani.
>
>
> >
> > Signed-off-by: Lyude Paul <[email protected]>
> > Fixes: 4a8d79901d5b ("drm/i915/dp: Enable Intel's HDR backlight interface
> > (only SDR for now)")
> > Cc: Ville Syrjälä <[email protected]>
> > Cc: <[email protected]> # v5.12+
> > ---
> > drivers/gpu/drm/i915/display/intel_display_types.h | 3 +++
> > drivers/gpu/drm/i915/display/intel_dp.c | 3 +++
> > drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 11 +++++++++++
> > 3 files changed, 17 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h
> > b/drivers/gpu/drm/i915/display/intel_display_types.h
> > index ea1e8a6e10b0..b9c967837872 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> > +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> > @@ -1653,6 +1653,9 @@ struct intel_dp {
> > struct intel_dp_pcon_frl frl;
> >
> > struct intel_psr psr;
> > +
> > + /* When we last wrote the OUI for eDP */
> > + unsigned long last_oui_write;
> > };
> >
> > enum lspcon_vendor {
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> > b/drivers/gpu/drm/i915/display/intel_dp.c
> > index 0a424bf69396..77d9a9390c1e 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> > @@ -29,6 +29,7 @@
> > #include <linux/i2c.h>
> > #include <linux/notifier.h>
> > #include <linux/slab.h>
> > +#include <linux/timekeeping.h>
> > #include <linux/types.h>
> >
> > #include <asm/byteorder.h>
> > @@ -2010,6 +2011,8 @@ intel_edp_init_source_oui(struct intel_dp *intel_dp,
> > bool careful)
> >
> > if (drm_dp_dpcd_write(&intel_dp->aux, DP_SOURCE_OUI, oui,
> > sizeof(oui)) < 0)
> > drm_err(&i915->drm, "Failed to write source OUI\n");
> > +
> > + intel_dp->last_oui_write = jiffies;
> > }
> >
> > /* If the device supports it, try to set the power state appropriately */
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > index 569d17b4d00f..2c35b999ec2c 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > @@ -96,6 +96,13 @@
> > #define INTEL_EDP_BRIGHTNESS_OPTIMIZATION_1
> > 0x359
> >
> > /* Intel EDP backlight callbacks */
> > +static void
> > +wait_for_oui(struct drm_i915_private *i915, struct intel_dp *intel_dp)
> > +{
> > + drm_dbg_kms(&i915->drm, "Performing OUI wait\n");
> > + wait_remaining_ms_from_jiffies(intel_dp->last_oui_write, 30);
> > +}
> > +
> > static bool
> > intel_dp_aux_supports_hdr_backlight(struct intel_connector *connector)
> > {
> > @@ -106,6 +113,8 @@ intel_dp_aux_supports_hdr_backlight(struct
> > intel_connector *connector)
> > int ret;
> > u8 tcon_cap[4];
> >
> > + wait_for_oui(i915, intel_dp);
> > +
> > ret = drm_dp_dpcd_read(aux, INTEL_EDP_HDR_TCON_CAP0, tcon_cap,
> > sizeof(tcon_cap));
> > if (ret != sizeof(tcon_cap))
> > return false;
> > @@ -204,6 +213,8 @@ intel_dp_aux_hdr_enable_backlight(const struct
> > intel_crtc_state *crtc_state,
> > int ret;
> > u8 old_ctrl, ctrl;
> >
> > + wait_for_oui(i915, intel_dp);
> > +
> > ret = drm_dp_dpcd_readb(&intel_dp->aux,
> > INTEL_EDP_HDR_GETSET_CTRL_PARAMS, &old_ctrl);
> > if (ret != 1) {
> > drm_err(&i915->drm, "Failed to read current backlight
> > control mode: %d\n", ret);
>
--
Cheers,
Lyude Paul (she/her)
Software Engineer at Red Hat