The current implementation reduces the sampling rate by half
if qup HW version greater is than 2.5 by checking if the geni
SE major version is greater than 2 and geni SE minor version
is greater than 5.
This implementation fails when the version is 3 or greater.
Hence by adding the another check for geni SE major version,
this problem can be solved.
Signed-off-by: Paras Sharma <[email protected]>
---
drivers/tty/serial/qcom_geni_serial.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 3aa29d2..a9f92d8 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -995,7 +995,8 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport,
sampling_rate = UART_OVERSAMPLING;
/* Sampling rate is halved for IP versions >= 2.5 */
ver = geni_se_get_qup_hw_version(&port->se);
- if (GENI_SE_VERSION_MAJOR(ver) >= 2 && GENI_SE_VERSION_MINOR(ver) >= 5)
+ if ((GENI_SE_VERSION_MAJOR(ver) >= 2 && GENI_SE_VERSION_MINOR(ver) >= 5)
+ || GENI_SE_VERSION_MAJOR(ver) >= 3)
sampling_rate /= 2;
clk_rate = get_clk_div_rate(baud, sampling_rate, &clk_div);
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
On Tue, Aug 11, 2020 at 01:13:14PM +0530, Paras Sharma wrote:
> The current implementation reduces the sampling rate by half
> if qup HW version greater is than 2.5 by checking if the geni
> SE major version is greater than 2 and geni SE minor version
> is greater than 5.
>
> This implementation fails when the version is 3 or greater.
>
> Hence by adding the another check for geni SE major version,
> this problem can be solved.
>
> Signed-off-by: Paras Sharma <[email protected]>
> ---
> drivers/tty/serial/qcom_geni_serial.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
Should this go to stable kernels? If so, how far back? What git commit
id is this patch fixing? And if so, why not put a Fixes: tag on this as
well?
thanks,
greg k-h
Hi,
Paras Sharma <[email protected]> writes:
> The current implementation reduces the sampling rate by half
> if qup HW version greater is than 2.5 by checking if the geni
^^^^^^^^^^^^^^^
is greater than
could, possibly, be fixed while applying.
> SE major version is greater than 2 and geni SE minor version
> is greater than 5.
>
> This implementation fails when the version is 3 or greater.
>
> Hence by adding the another check for geni SE major version,
> this problem can be solved.
>
> Signed-off-by: Paras Sharma <[email protected]>
> ---
> drivers/tty/serial/qcom_geni_serial.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
> index 3aa29d2..a9f92d8 100644
> --- a/drivers/tty/serial/qcom_geni_serial.c
> +++ b/drivers/tty/serial/qcom_geni_serial.c
> @@ -995,7 +995,8 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport,
> sampling_rate = UART_OVERSAMPLING;
> /* Sampling rate is halved for IP versions >= 2.5 */
> ver = geni_se_get_qup_hw_version(&port->se);
> - if (GENI_SE_VERSION_MAJOR(ver) >= 2 && GENI_SE_VERSION_MINOR(ver) >= 5)
> + if ((GENI_SE_VERSION_MAJOR(ver) >= 2 && GENI_SE_VERSION_MINOR(ver) >= 5)
> + || GENI_SE_VERSION_MAJOR(ver) >= 3)
it looks like having a single GENI_SE_VERSION() that returns MAJOR and
MINOR without STEP would look better here. Then you could use:
if (GENI_SE_VERSION(ver) >= 0x20050000)
and it would work for any future version. Not a strong opinion, though
--
balbi
On Tue, Aug 11, 2020 at 10:23:30AM +0200, Greg Kroah-Hartman wrote:
> On Tue, Aug 11, 2020 at 01:13:14PM +0530, Paras Sharma wrote:
> > The current implementation reduces the sampling rate by half
> > if qup HW version greater is than 2.5 by checking if the geni
> > SE major version is greater than 2 and geni SE minor version
> > is greater than 5.
> >
> > This implementation fails when the version is 3 or greater.
> >
> > Hence by adding the another check for geni SE major version,
> > this problem can be solved.
> >
> > Signed-off-by: Paras Sharma <[email protected]>
> > ---
> > drivers/tty/serial/qcom_geni_serial.c | 3 ++-
> > 1 file changed, 2 insertions(+), 1 deletion(-)
>
> Should this go to stable kernels? If so, how far back? What git commit
> id is this patch fixing? And if so, why not put a Fixes: tag on this as
> well?
Dropped from my review queue due to lack of response, please fix up and
resend when you wish to have it reviewed again...
greg k-h