* [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
@ 2020-04-24 6:35 ` Bernard Zhao
0 siblings, 0 replies; 13+ messages in thread
From: Bernard Zhao @ 2020-04-24 6:35 UTC (permalink / raw)
To: Liviu Dudau, Brian Starkey, David Airlie, Daniel Vetter,
dri-devel, linux-kernel
Cc: opensource.kernel, Bernard Zhao
The pixel clock is still enabled when the format is wrong.
no error branch handle, and also some register is not set
in this case, e.g: HDLCD_REG_<color>_SELECT. Maybe we
should disable this clock and throw an warn message when
this happened.
With this change, the code maybe a bit more readable.
Signed-off-by: Bernard Zhao <bernard@vivo.com>
Changes since V1:
*add format error handle, if format is not correct, throw
an warning message and disable this clock.
Link for V1:
*https://lore.kernel.org/patchwork/patch/1228501/
---
drivers/gpu/drm/arm/hdlcd_crtc.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/arm/hdlcd_crtc.c b/drivers/gpu/drm/arm/hdlcd_crtc.c
index af67fefed38d..f3945dee2b7d 100644
--- a/drivers/gpu/drm/arm/hdlcd_crtc.c
+++ b/drivers/gpu/drm/arm/hdlcd_crtc.c
@@ -96,7 +96,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
}
if (WARN_ON(!format))
- return 0;
+ return -EINVAL;
/* HDLCD uses 'bytes per pixel', zero means 1 byte */
btpp = (format->bits_per_pixel + 7) / 8;
@@ -125,7 +125,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
return 0;
}
-static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
+static int hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
{
struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
struct drm_display_mode *m = &crtc->state->adjusted_mode;
@@ -162,9 +162,10 @@ static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
err = hdlcd_set_pxl_fmt(crtc);
if (err)
- return;
+ return err;
clk_set_rate(hdlcd->clk, m->crtc_clock * 1000);
+ return 0;
}
static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
@@ -173,7 +174,11 @@ static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
clk_prepare_enable(hdlcd->clk);
- hdlcd_crtc_mode_set_nofb(crtc);
+ if (hdlcd_crtc_mode_set_nofb(crtc)) {
+ DRM_DEBUG_KMS("Invalid format, pixel clock enable failed!\n");
+ clk_disable_unprepare(hdlcd->clk);
+ return;
+ }
hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 1);
drm_crtc_vblank_on(crtc);
}
--
2.26.2
^ permalink raw reply related [flat|nested] 13+ messages in thread
* [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
@ 2020-04-24 6:35 ` Bernard Zhao
0 siblings, 0 replies; 13+ messages in thread
From: Bernard Zhao @ 2020-04-24 6:35 UTC (permalink / raw)
To: Liviu Dudau, Brian Starkey, David Airlie, Daniel Vetter,
dri-devel, linux-kernel
Cc: opensource.kernel, Bernard Zhao
The pixel clock is still enabled when the format is wrong.
no error branch handle, and also some register is not set
in this case, e.g: HDLCD_REG_<color>_SELECT. Maybe we
should disable this clock and throw an warn message when
this happened.
With this change, the code maybe a bit more readable.
Signed-off-by: Bernard Zhao <bernard@vivo.com>
Changes since V1:
*add format error handle, if format is not correct, throw
an warning message and disable this clock.
Link for V1:
*https://lore.kernel.org/patchwork/patch/1228501/
---
drivers/gpu/drm/arm/hdlcd_crtc.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/arm/hdlcd_crtc.c b/drivers/gpu/drm/arm/hdlcd_crtc.c
index af67fefed38d..f3945dee2b7d 100644
--- a/drivers/gpu/drm/arm/hdlcd_crtc.c
+++ b/drivers/gpu/drm/arm/hdlcd_crtc.c
@@ -96,7 +96,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
}
if (WARN_ON(!format))
- return 0;
+ return -EINVAL;
/* HDLCD uses 'bytes per pixel', zero means 1 byte */
btpp = (format->bits_per_pixel + 7) / 8;
@@ -125,7 +125,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
return 0;
}
-static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
+static int hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
{
struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
struct drm_display_mode *m = &crtc->state->adjusted_mode;
@@ -162,9 +162,10 @@ static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
err = hdlcd_set_pxl_fmt(crtc);
if (err)
- return;
+ return err;
clk_set_rate(hdlcd->clk, m->crtc_clock * 1000);
+ return 0;
}
static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
@@ -173,7 +174,11 @@ static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
clk_prepare_enable(hdlcd->clk);
- hdlcd_crtc_mode_set_nofb(crtc);
+ if (hdlcd_crtc_mode_set_nofb(crtc)) {
+ DRM_DEBUG_KMS("Invalid format, pixel clock enable failed!\n");
+ clk_disable_unprepare(hdlcd->clk);
+ return;
+ }
hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 1);
drm_crtc_vblank_on(crtc);
}
--
2.26.2
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply related [flat|nested] 13+ messages in thread
* Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
2020-04-24 6:35 ` Bernard Zhao
@ 2020-04-24 11:00 ` Emil Velikov
-1 siblings, 0 replies; 13+ messages in thread
From: Emil Velikov @ 2020-04-24 11:00 UTC (permalink / raw)
To: Bernard Zhao
Cc: Liviu Dudau, Brian Starkey, David Airlie, Daniel Vetter,
ML dri-devel, Linux-Kernel@Vger. Kernel. Org, opensource.kernel
Hi Bernard,
On Fri, 24 Apr 2020 at 08:15, Bernard Zhao <bernard@vivo.com> wrote:
>
> The pixel clock is still enabled when the format is wrong.
> no error branch handle, and also some register is not set
> in this case, e.g: HDLCD_REG_<color>_SELECT. Maybe we
> should disable this clock and throw an warn message when
> this happened.
> With this change, the code maybe a bit more readable.
>
> Signed-off-by: Bernard Zhao <bernard@vivo.com>
>
> Changes since V1:
> *add format error handle, if format is not correct, throw
> an warning message and disable this clock.
>
> Link for V1:
> *https://lore.kernel.org/patchwork/patch/1228501/
> ---
> drivers/gpu/drm/arm/hdlcd_crtc.c | 13 +++++++++----
> 1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/arm/hdlcd_crtc.c b/drivers/gpu/drm/arm/hdlcd_crtc.c
> index af67fefed38d..f3945dee2b7d 100644
> --- a/drivers/gpu/drm/arm/hdlcd_crtc.c
> +++ b/drivers/gpu/drm/arm/hdlcd_crtc.c
> @@ -96,7 +96,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
> }
>
> if (WARN_ON(!format))
> - return 0;
> + return -EINVAL;
>
> /* HDLCD uses 'bytes per pixel', zero means 1 byte */
> btpp = (format->bits_per_pixel + 7) / 8;
> @@ -125,7 +125,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
> return 0;
> }
>
> -static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
> +static int hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
> {
> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
> struct drm_display_mode *m = &crtc->state->adjusted_mode;
> @@ -162,9 +162,10 @@ static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>
> err = hdlcd_set_pxl_fmt(crtc);
> if (err)
> - return;
> + return err;
>
> clk_set_rate(hdlcd->clk, m->crtc_clock * 1000);
> + return 0;
> }
>
> static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
> @@ -173,7 +174,11 @@ static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
>
> clk_prepare_enable(hdlcd->clk);
> - hdlcd_crtc_mode_set_nofb(crtc);
> + if (hdlcd_crtc_mode_set_nofb(crtc)) {
> + DRM_DEBUG_KMS("Invalid format, pixel clock enable failed!\n");
> + clk_disable_unprepare(hdlcd->clk);
> + return;
> + }
This doesn't seem right. As far as I can tell, the state must be
checked in the .atomic_check since .atomic_enable, intentionally,
"cannot" fail.
HTH
Emil
> hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 1);
> drm_crtc_vblank_on(crtc);
> }
> --
> 2.26.2
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
@ 2020-04-24 11:00 ` Emil Velikov
0 siblings, 0 replies; 13+ messages in thread
From: Emil Velikov @ 2020-04-24 11:00 UTC (permalink / raw)
To: Bernard Zhao
Cc: opensource.kernel, David Airlie, Liviu Dudau,
Linux-Kernel@Vger. Kernel. Org, ML dri-devel
Hi Bernard,
On Fri, 24 Apr 2020 at 08:15, Bernard Zhao <bernard@vivo.com> wrote:
>
> The pixel clock is still enabled when the format is wrong.
> no error branch handle, and also some register is not set
> in this case, e.g: HDLCD_REG_<color>_SELECT. Maybe we
> should disable this clock and throw an warn message when
> this happened.
> With this change, the code maybe a bit more readable.
>
> Signed-off-by: Bernard Zhao <bernard@vivo.com>
>
> Changes since V1:
> *add format error handle, if format is not correct, throw
> an warning message and disable this clock.
>
> Link for V1:
> *https://lore.kernel.org/patchwork/patch/1228501/
> ---
> drivers/gpu/drm/arm/hdlcd_crtc.c | 13 +++++++++----
> 1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/arm/hdlcd_crtc.c b/drivers/gpu/drm/arm/hdlcd_crtc.c
> index af67fefed38d..f3945dee2b7d 100644
> --- a/drivers/gpu/drm/arm/hdlcd_crtc.c
> +++ b/drivers/gpu/drm/arm/hdlcd_crtc.c
> @@ -96,7 +96,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
> }
>
> if (WARN_ON(!format))
> - return 0;
> + return -EINVAL;
>
> /* HDLCD uses 'bytes per pixel', zero means 1 byte */
> btpp = (format->bits_per_pixel + 7) / 8;
> @@ -125,7 +125,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
> return 0;
> }
>
> -static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
> +static int hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
> {
> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
> struct drm_display_mode *m = &crtc->state->adjusted_mode;
> @@ -162,9 +162,10 @@ static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>
> err = hdlcd_set_pxl_fmt(crtc);
> if (err)
> - return;
> + return err;
>
> clk_set_rate(hdlcd->clk, m->crtc_clock * 1000);
> + return 0;
> }
>
> static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
> @@ -173,7 +174,11 @@ static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
>
> clk_prepare_enable(hdlcd->clk);
> - hdlcd_crtc_mode_set_nofb(crtc);
> + if (hdlcd_crtc_mode_set_nofb(crtc)) {
> + DRM_DEBUG_KMS("Invalid format, pixel clock enable failed!\n");
> + clk_disable_unprepare(hdlcd->clk);
> + return;
> + }
This doesn't seem right. As far as I can tell, the state must be
checked in the .atomic_check since .atomic_enable, intentionally,
"cannot" fail.
HTH
Emil
> hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 1);
> drm_crtc_vblank_on(crtc);
> }
> --
> 2.26.2
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
2020-04-24 6:35 ` Bernard Zhao
@ 2020-04-24 11:09 ` Liviu Dudau
-1 siblings, 0 replies; 13+ messages in thread
From: Liviu Dudau @ 2020-04-24 11:09 UTC (permalink / raw)
To: Bernard Zhao
Cc: Brian Starkey, David Airlie, Daniel Vetter, dri-devel,
linux-kernel, opensource.kernel
Hi Bernand,
On Thu, Apr 23, 2020 at 11:35:51PM -0700, Bernard Zhao wrote:
> The pixel clock is still enabled when the format is wrong.
> no error branch handle, and also some register is not set
> in this case, e.g: HDLCD_REG_<color>_SELECT. Maybe we
> should disable this clock and throw an warn message when
> this happened.
> With this change, the code maybe a bit more readable.
>
> Signed-off-by: Bernard Zhao <bernard@vivo.com>
>
> Changes since V1:
> *add format error handle, if format is not correct, throw
> an warning message and disable this clock.
>
> Link for V1:
> *https://lore.kernel.org/patchwork/patch/1228501/
> ---
> drivers/gpu/drm/arm/hdlcd_crtc.c | 13 +++++++++----
> 1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/arm/hdlcd_crtc.c b/drivers/gpu/drm/arm/hdlcd_crtc.c
> index af67fefed38d..f3945dee2b7d 100644
> --- a/drivers/gpu/drm/arm/hdlcd_crtc.c
> +++ b/drivers/gpu/drm/arm/hdlcd_crtc.c
> @@ -96,7 +96,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
> }
>
> if (WARN_ON(!format))
> - return 0;
> + return -EINVAL;
That is the right fix!
>
> /* HDLCD uses 'bytes per pixel', zero means 1 byte */
> btpp = (format->bits_per_pixel + 7) / 8;
> @@ -125,7 +125,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
> return 0;
> }
>
> -static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
> +static int hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
But this is not. We don't need to propagate the error further, just ....
> {
> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
> struct drm_display_mode *m = &crtc->state->adjusted_mode;
> @@ -162,9 +162,10 @@ static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>
> err = hdlcd_set_pxl_fmt(crtc);
> if (err)
> - return;
... return here so that we don't call clk_set_rate();
Best regards,
Liviu
> + return err;
>
> clk_set_rate(hdlcd->clk, m->crtc_clock * 1000);
> + return 0;
> }
>
> static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
> @@ -173,7 +174,11 @@ static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
>
> clk_prepare_enable(hdlcd->clk);
> - hdlcd_crtc_mode_set_nofb(crtc);
> + if (hdlcd_crtc_mode_set_nofb(crtc)) {
> + DRM_DEBUG_KMS("Invalid format, pixel clock enable failed!\n");
> + clk_disable_unprepare(hdlcd->clk);
> + return;
> + }
> hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 1);
> drm_crtc_vblank_on(crtc);
> }
> --
> 2.26.2
>
--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
¯\_(ツ)_/¯
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
@ 2020-04-24 11:09 ` Liviu Dudau
0 siblings, 0 replies; 13+ messages in thread
From: Liviu Dudau @ 2020-04-24 11:09 UTC (permalink / raw)
To: Bernard Zhao; +Cc: opensource.kernel, David Airlie, linux-kernel, dri-devel
Hi Bernand,
On Thu, Apr 23, 2020 at 11:35:51PM -0700, Bernard Zhao wrote:
> The pixel clock is still enabled when the format is wrong.
> no error branch handle, and also some register is not set
> in this case, e.g: HDLCD_REG_<color>_SELECT. Maybe we
> should disable this clock and throw an warn message when
> this happened.
> With this change, the code maybe a bit more readable.
>
> Signed-off-by: Bernard Zhao <bernard@vivo.com>
>
> Changes since V1:
> *add format error handle, if format is not correct, throw
> an warning message and disable this clock.
>
> Link for V1:
> *https://lore.kernel.org/patchwork/patch/1228501/
> ---
> drivers/gpu/drm/arm/hdlcd_crtc.c | 13 +++++++++----
> 1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/arm/hdlcd_crtc.c b/drivers/gpu/drm/arm/hdlcd_crtc.c
> index af67fefed38d..f3945dee2b7d 100644
> --- a/drivers/gpu/drm/arm/hdlcd_crtc.c
> +++ b/drivers/gpu/drm/arm/hdlcd_crtc.c
> @@ -96,7 +96,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
> }
>
> if (WARN_ON(!format))
> - return 0;
> + return -EINVAL;
That is the right fix!
>
> /* HDLCD uses 'bytes per pixel', zero means 1 byte */
> btpp = (format->bits_per_pixel + 7) / 8;
> @@ -125,7 +125,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
> return 0;
> }
>
> -static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
> +static int hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
But this is not. We don't need to propagate the error further, just ....
> {
> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
> struct drm_display_mode *m = &crtc->state->adjusted_mode;
> @@ -162,9 +162,10 @@ static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>
> err = hdlcd_set_pxl_fmt(crtc);
> if (err)
> - return;
... return here so that we don't call clk_set_rate();
Best regards,
Liviu
> + return err;
>
> clk_set_rate(hdlcd->clk, m->crtc_clock * 1000);
> + return 0;
> }
>
> static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
> @@ -173,7 +174,11 @@ static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
>
> clk_prepare_enable(hdlcd->clk);
> - hdlcd_crtc_mode_set_nofb(crtc);
> + if (hdlcd_crtc_mode_set_nofb(crtc)) {
> + DRM_DEBUG_KMS("Invalid format, pixel clock enable failed!\n");
> + clk_disable_unprepare(hdlcd->clk);
> + return;
> + }
> hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 1);
> drm_crtc_vblank_on(crtc);
> }
> --
> 2.26.2
>
--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
¯\_(ツ)_/¯
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re:Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
2020-04-24 11:09 ` Liviu Dudau
(?)
@ 2020-04-24 11:37 ` 赵军奎
2020-05-08 8:47 ` Bernard
-1 siblings, 1 reply; 13+ messages in thread
From: 赵军奎 @ 2020-04-24 11:37 UTC (permalink / raw)
To: Liviu Dudau; +Cc: opensource.kernel, David Airlie, linux-kernel, dri-devel
[-- Attachment #1.1: Type: text/plain, Size: 3732 bytes --]
From: Liviu Dudau <liviu.dudau@arm.com>
Date: 2020-04-24 19:09:50
To: Bernard Zhao <bernard@vivo.com>
Cc: Brian Starkey <brian.starkey@arm.com>,David Airlie <airlied@linux.ie>,Daniel Vetter <daniel@ffwll.ch>,dri-devel@lists.freedesktop.org,linux-kernel@vger.kernel.org,opensource.kernel@vivo.com
Subject: Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format>Hi Bernand,
>
>On Thu, Apr 23, 2020 at 11:35:51PM -0700, Bernard Zhao wrote:
>> The pixel clock is still enabled when the format is wrong.
>> no error branch handle, and also some register is not set
>> in this case, e.g: HDLCD_REG_<color>_SELECT. Maybe we
>> should disable this clock and throw an warn message when
>> this happened.
>> With this change, the code maybe a bit more readable.
>>
>> Signed-off-by: Bernard Zhao <bernard@vivo.com>
>>
>> Changes since V1:
>> *add format error handle, if format is not correct, throw
>> an warning message and disable this clock.
>>
>> Link for V1:
>> *https://lore.kernel.org/patchwork/patch/1228501/
>> ---
>> drivers/gpu/drm/arm/hdlcd_crtc.c | 13 +++++++++----
>> 1 file changed, 9 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/arm/hdlcd_crtc.c b/drivers/gpu/drm/arm/hdlcd_crtc.c
>> index af67fefed38d..f3945dee2b7d 100644
>> --- a/drivers/gpu/drm/arm/hdlcd_crtc.c
>> +++ b/drivers/gpu/drm/arm/hdlcd_crtc.c
>> @@ -96,7 +96,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
>> }
>>
>> if (WARN_ON(!format))
>> - return 0;
>> + return -EINVAL;
>
>That is the right fix!
>
>>
>> /* HDLCD uses 'bytes per pixel', zero means 1 byte */
>> btpp = (format->bits_per_pixel + 7) / 8;
>> @@ -125,7 +125,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
>> return 0;
>> }
>>
>> -static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>> +static int hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>
>But this is not. We don't need to propagate the error further, just ....
>
>> {
>> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
>> struct drm_display_mode *m = &crtc->state->adjusted_mode;
>> @@ -162,9 +162,10 @@ static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>>
>> err = hdlcd_set_pxl_fmt(crtc);
>> if (err)
>> - return;
>My previous understanding was that when such an exception occurred, it was caught
in the atomic_enable interface, and then disable pixel clock. I am not sure is this ok or
i have to do more register clean operaction.
>... return here so that we don't call clk_set_rate();
And for this part, i am a little confused :
1 clk_set_rate must be set even if format is wrong?
2 The original code logic shows that If format is not correct, we will not set registers
HDLCD_REG_PIXEL_FORMAT & HDLCD_REG_<color>_SELECT, will this bring in
any problems?
3 if 1 the rate must set & 2 registers above doesn`t matter, then maybe there is no
need to disable pixel clock.
Regards,
Bernard
>> + return err; >> >> clk_set_rate(hdlcd->clk, m->crtc_clock * 1000); >> + return 0; >> } >> >> static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc, >> @@ -173,7 +174,11 @@ static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc, >> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc); >> >> clk_prepare_enable(hdlcd->clk); >> - hdlcd_crtc_mode_set_nofb(crtc); >> + if (hdlcd_crtc_mode_set_nofb(crtc)) { >> + DRM_DEBUG_KMS("Invalid format, pixel clock enable failed!\n"); >> + clk_disable_unprepare(hdlcd->clk); >> + return; >> + } >> hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 1); >> drm_crtc_vblank_on(crtc); >> } >> -- >> 2.26.2 >> > >-- >==================== >| I would like to | >| fix the world, | >| but they're not | >| giving me the | > \ source code! / > --------------- > ¯\_(ツ)_/¯
[-- Attachment #1.2: Type: text/html, Size: 4629 bytes --]
[-- Attachment #2: Type: text/plain, Size: 160 bytes --]
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re:Re:Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
2020-04-24 11:37 ` 赵军奎
@ 2020-05-08 8:47 ` Bernard
0 siblings, 0 replies; 13+ messages in thread
From: Bernard @ 2020-05-08 8:47 UTC (permalink / raw)
To: 赵军奎
Cc: Liviu Dudau, Brian Starkey, David Airlie, Daniel Vetter,
dri-devel, linux-kernel, opensource.kernel
From: "赵军奎" <bernard@vivo.com>
Date: 2020-04-24 19:37:36
To: Liviu Dudau <liviu.dudau@arm.com>
Cc: Brian Starkey <brian.starkey@arm.com>,David Airlie <airlied@linux.ie>,Daniel Vetter <daniel@ffwll.ch>,dri-devel@lists.freedesktop.org,linux-kernel@vger.kernel.org,opensource.kernel@vivo.com
Subject: Re:Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
From: Liviu Dudau <liviu.dudau@arm.com>
Date: 2020-04-24 19:09:50
To: Bernard Zhao <bernard@vivo.com>
Cc: Brian Starkey <brian.starkey@arm.com>,David Airlie <airlied@linux.ie>,Daniel Vetter <daniel@ffwll.ch>,dri-devel@lists.freedesktop.org,linux-kernel@vger.kernel.org,opensource.kernel@vivo.com
Subject: Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format>Hi Bernand,
>
>On Thu, Apr 23, 2020 at 11:35:51PM -0700, Bernard Zhao wrote:
>> The pixel clock is still enabled when the format is wrong.
>> no error branch handle, and also some register is not set
>> in this case, e.g: HDLCD_REG_<color>_SELECT. Maybe we
>> should disable this clock and throw an warn message when
>> this happened.
>> With this change, the code maybe a bit more readable.
>>
>> Signed-off-by: Bernard Zhao <bernard@vivo.com>
>>
>> Changes since V1:
>> *add format error handle, if format is not correct, throw
>> an warning message and disable this clock.
>>
>> Link for V1:
>> *https://lore.kernel.org/patchwork/patch/1228501/
>> ---
>> drivers/gpu/drm/arm/hdlcd_crtc.c | 13 +++++++++----
>> 1 file changed, 9 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/arm/hdlcd_crtc.c b/drivers/gpu/drm/arm/hdlcd_crtc.c
>> index af67fefed38d..f3945dee2b7d 100644
>> --- a/drivers/gpu/drm/arm/hdlcd_crtc.c
>> +++ b/drivers/gpu/drm/arm/hdlcd_crtc.c
>> @@ -96,7 +96,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
>> }
>>
>> if (WARN_ON(!format))
>> - return 0;
>> + return -EINVAL;
>
>That is the right fix!
>
>>
>> /* HDLCD uses 'bytes per pixel', zero means 1 byte */
>> btpp = (format->bits_per_pixel + 7) / 8;
>> @@ -125,7 +125,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
>> return 0;
>> }
>>
>> -static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>> +static int hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>
>But this is not. We don't need to propagate the error further, just ....
>
>> {
>> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
>> struct drm_display_mode *m = &crtc->state->adjusted_mode;
>> @@ -162,9 +162,10 @@ static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>>
>> err = hdlcd_set_pxl_fmt(crtc);
>> if (err)
>> - return;
>
My previous understanding was that when such an exception occurred, it was caught
in the atomic_enable interface, and then disable pixel clock. I am not sure is this ok or
i have to do more register clean operaction.
>... return here so that we don't call clk_set_rate();
And for this part, i am a little confused :
1 clk_set_rate must be set even if format is wrong?
2 The original code logic shows that If format is not correct, we will not set registers
HDLCD_REG_PIXEL_FORMAT & HDLCD_REG_<color>_SELECT, will this bring in
any problems?
3 if 1 the rate must set & 2 registers above doesn`t matter, then maybe there is no
need to disable pixel clock.
Am i misunderstanding
Regards,
Bernard
>> + return err;
>>
>> clk_set_rate(hdlcd->clk, m->crtc_clock * 1000);
>> + return 0;
>> }
>>
>> static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
>> @@ -173,7 +174,11 @@ static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
>> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
>>
>> clk_prepare_enable(hdlcd->clk);
>> - hdlcd_crtc_mode_set_nofb(crtc);
>> + if (hdlcd_crtc_mode_set_nofb(crtc)) {
>> + DRM_DEBUG_KMS("Invalid format, pixel clock enable failed!\n");
>> + clk_disable_unprepare(hdlcd->clk);
>> + return;
>> + }
>> hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 1);
>> drm_crtc_vblank_on(crtc);
>> }
>> --
>> 2.26.2
>>
>
>--
>====================
>| I would like to |
>| fix the world, |
>| but they're not |
>| giving me the |
> \ source code! /
> ---------------
> ¯\_(ツ)_/¯
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re:Re:Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
@ 2020-05-08 8:47 ` Bernard
0 siblings, 0 replies; 13+ messages in thread
From: Bernard @ 2020-05-08 8:47 UTC (permalink / raw)
To: 赵军奎
Cc: opensource.kernel, David Airlie, Liviu Dudau, linux-kernel, dri-devel
From: "赵军奎" <bernard@vivo.com>
Date: 2020-04-24 19:37:36
To: Liviu Dudau <liviu.dudau@arm.com>
Cc: Brian Starkey <brian.starkey@arm.com>,David Airlie <airlied@linux.ie>,Daniel Vetter <daniel@ffwll.ch>,dri-devel@lists.freedesktop.org,linux-kernel@vger.kernel.org,opensource.kernel@vivo.com
Subject: Re:Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
From: Liviu Dudau <liviu.dudau@arm.com>
Date: 2020-04-24 19:09:50
To: Bernard Zhao <bernard@vivo.com>
Cc: Brian Starkey <brian.starkey@arm.com>,David Airlie <airlied@linux.ie>,Daniel Vetter <daniel@ffwll.ch>,dri-devel@lists.freedesktop.org,linux-kernel@vger.kernel.org,opensource.kernel@vivo.com
Subject: Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format>Hi Bernand,
>
>On Thu, Apr 23, 2020 at 11:35:51PM -0700, Bernard Zhao wrote:
>> The pixel clock is still enabled when the format is wrong.
>> no error branch handle, and also some register is not set
>> in this case, e.g: HDLCD_REG_<color>_SELECT. Maybe we
>> should disable this clock and throw an warn message when
>> this happened.
>> With this change, the code maybe a bit more readable.
>>
>> Signed-off-by: Bernard Zhao <bernard@vivo.com>
>>
>> Changes since V1:
>> *add format error handle, if format is not correct, throw
>> an warning message and disable this clock.
>>
>> Link for V1:
>> *https://lore.kernel.org/patchwork/patch/1228501/
>> ---
>> drivers/gpu/drm/arm/hdlcd_crtc.c | 13 +++++++++----
>> 1 file changed, 9 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/arm/hdlcd_crtc.c b/drivers/gpu/drm/arm/hdlcd_crtc.c
>> index af67fefed38d..f3945dee2b7d 100644
>> --- a/drivers/gpu/drm/arm/hdlcd_crtc.c
>> +++ b/drivers/gpu/drm/arm/hdlcd_crtc.c
>> @@ -96,7 +96,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
>> }
>>
>> if (WARN_ON(!format))
>> - return 0;
>> + return -EINVAL;
>
>That is the right fix!
>
>>
>> /* HDLCD uses 'bytes per pixel', zero means 1 byte */
>> btpp = (format->bits_per_pixel + 7) / 8;
>> @@ -125,7 +125,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
>> return 0;
>> }
>>
>> -static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>> +static int hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>
>But this is not. We don't need to propagate the error further, just ....
>
>> {
>> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
>> struct drm_display_mode *m = &crtc->state->adjusted_mode;
>> @@ -162,9 +162,10 @@ static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>>
>> err = hdlcd_set_pxl_fmt(crtc);
>> if (err)
>> - return;
>
My previous understanding was that when such an exception occurred, it was caught
in the atomic_enable interface, and then disable pixel clock. I am not sure is this ok or
i have to do more register clean operaction.
>... return here so that we don't call clk_set_rate();
And for this part, i am a little confused :
1 clk_set_rate must be set even if format is wrong?
2 The original code logic shows that If format is not correct, we will not set registers
HDLCD_REG_PIXEL_FORMAT & HDLCD_REG_<color>_SELECT, will this bring in
any problems?
3 if 1 the rate must set & 2 registers above doesn`t matter, then maybe there is no
need to disable pixel clock.
Am i misunderstanding
Regards,
Bernard
>> + return err;
>>
>> clk_set_rate(hdlcd->clk, m->crtc_clock * 1000);
>> + return 0;
>> }
>>
>> static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
>> @@ -173,7 +174,11 @@ static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
>> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
>>
>> clk_prepare_enable(hdlcd->clk);
>> - hdlcd_crtc_mode_set_nofb(crtc);
>> + if (hdlcd_crtc_mode_set_nofb(crtc)) {
>> + DRM_DEBUG_KMS("Invalid format, pixel clock enable failed!\n");
>> + clk_disable_unprepare(hdlcd->clk);
>> + return;
>> + }
>> hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 1);
>> drm_crtc_vblank_on(crtc);
>> }
>> --
>> 2.26.2
>>
>
>--
>====================
>| I would like to |
>| fix the world, |
>| but they're not |
>| giving me the |
> \ source code! /
> ---------------
> ¯\_(ツ)_/¯
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: Re:Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
2020-05-08 8:47 ` Bernard
@ 2020-05-15 14:41 ` Liviu Dudau
-1 siblings, 0 replies; 13+ messages in thread
From: Liviu Dudau @ 2020-05-15 14:41 UTC (permalink / raw)
To: Bernard
Cc: Brian Starkey, David Airlie, Daniel Vetter, dri-devel,
linux-kernel, opensource.kernel
Hi Bernard,
On Fri, May 08, 2020 at 04:47:17PM +0800, Bernard wrote:
> From: "赵军奎" <bernard@vivo.com>
> Date: 2020-04-24 19:37:36
> To: Liviu Dudau <liviu.dudau@arm.com>
> Cc: Brian Starkey <brian.starkey@arm.com>,David Airlie <airlied@linux.ie>,Daniel Vetter <daniel@ffwll.ch>,dri-devel@lists.freedesktop.org,linux-kernel@vger.kernel.org,opensource.kernel@vivo.com
> Subject: Re:Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
>
>
>
>
> From: Liviu Dudau <liviu.dudau@arm.com>
> Date: 2020-04-24 19:09:50
> To: Bernard Zhao <bernard@vivo.com>
> Cc: Brian Starkey <brian.starkey@arm.com>,David Airlie <airlied@linux.ie>,Daniel Vetter <daniel@ffwll.ch>,dri-devel@lists.freedesktop.org,linux-kernel@vger.kernel.org,opensource.kernel@vivo.com
> Subject: Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format>Hi Bernand,
> >
> >On Thu, Apr 23, 2020 at 11:35:51PM -0700, Bernard Zhao wrote:
> >> The pixel clock is still enabled when the format is wrong.
> >> no error branch handle, and also some register is not set
> >> in this case, e.g: HDLCD_REG_<color>_SELECT. Maybe we
> >> should disable this clock and throw an warn message when
> >> this happened.
> >> With this change, the code maybe a bit more readable.
> >>
> >> Signed-off-by: Bernard Zhao <bernard@vivo.com>
> >>
> >> Changes since V1:
> >> *add format error handle, if format is not correct, throw
> >> an warning message and disable this clock.
> >>
> >> Link for V1:
> >> *https://lore.kernel.org/patchwork/patch/1228501/
> >> ---
> >> drivers/gpu/drm/arm/hdlcd_crtc.c | 13 +++++++++----
> >> 1 file changed, 9 insertions(+), 4 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/arm/hdlcd_crtc.c b/drivers/gpu/drm/arm/hdlcd_crtc.c
> >> index af67fefed38d..f3945dee2b7d 100644
> >> --- a/drivers/gpu/drm/arm/hdlcd_crtc.c
> >> +++ b/drivers/gpu/drm/arm/hdlcd_crtc.c
> >> @@ -96,7 +96,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
> >> }
> >>
> >> if (WARN_ON(!format))
> >> - return 0;
> >> + return -EINVAL;
> >
> >That is the right fix!
> >
> >>
> >> /* HDLCD uses 'bytes per pixel', zero means 1 byte */
> >> btpp = (format->bits_per_pixel + 7) / 8;
> >> @@ -125,7 +125,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
> >> return 0;
> >> }
> >>
> >> -static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
> >> +static int hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
> >
> >But this is not. We don't need to propagate the error further, just ....
> >
> >> {
> >> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
> >> struct drm_display_mode *m = &crtc->state->adjusted_mode;
> >> @@ -162,9 +162,10 @@ static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
> >>
> >> err = hdlcd_set_pxl_fmt(crtc);
> >> if (err)
> >> - return;
> >
>
> My previous understanding was that when such an exception occurred, it was caught
> in the atomic_enable interface, and then disable pixel clock. I am not sure is this ok or
> i have to do more register clean operaction.
>
> >... return here so that we don't call clk_set_rate();
> And for this part, i am a little confused :
> 1 clk_set_rate must be set even if format is wrong?
> 2 The original code logic shows that If format is not correct, we will not set registers
> HDLCD_REG_PIXEL_FORMAT & HDLCD_REG_<color>_SELECT, will this bring in
> any problems?
> 3 if 1 the rate must set & 2 registers above doesn`t matter, then maybe there is no
> need to disable pixel clock.
> Am i misunderstanding
You are right, the pixel format check should not happen inside hdlcd_crtc_atomic_enable()
hook, it should be moved into a separate function hdlcd_crtc_atomic_check() and that needs
to be hooked into .atomic_check() for hdlcd_crtc_helper_funcs().
If you want to have another go I'll be happy to review and Ack your patch.
Best regards,
Liviu
>
> Regards,
> Bernard
>
> >> + return err;
> >>
> >> clk_set_rate(hdlcd->clk, m->crtc_clock * 1000);
> >> + return 0;
> >> }
> >>
> >> static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
> >> @@ -173,7 +174,11 @@ static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
> >> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
> >>
> >> clk_prepare_enable(hdlcd->clk);
> >> - hdlcd_crtc_mode_set_nofb(crtc);
> >> + if (hdlcd_crtc_mode_set_nofb(crtc)) {
> >> + DRM_DEBUG_KMS("Invalid format, pixel clock enable failed!\n");
> >> + clk_disable_unprepare(hdlcd->clk);
> >> + return;
> >> + }
> >> hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 1);
> >> drm_crtc_vblank_on(crtc);
> >> }
> >> --
> >> 2.26.2
> >>
> >
> >--
> >====================
> >| I would like to |
> >| fix the world, |
> >| but they're not |
> >| giving me the |
> > \ source code! /
> > ---------------
> > ¯\_(ツ)_/¯
>
>
>
--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
¯\_(ツ)_/¯
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: Re:Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
@ 2020-05-15 14:41 ` Liviu Dudau
0 siblings, 0 replies; 13+ messages in thread
From: Liviu Dudau @ 2020-05-15 14:41 UTC (permalink / raw)
To: Bernard; +Cc: opensource.kernel, David Airlie, linux-kernel, dri-devel
Hi Bernard,
On Fri, May 08, 2020 at 04:47:17PM +0800, Bernard wrote:
> From: "赵军奎" <bernard@vivo.com>
> Date: 2020-04-24 19:37:36
> To: Liviu Dudau <liviu.dudau@arm.com>
> Cc: Brian Starkey <brian.starkey@arm.com>,David Airlie <airlied@linux.ie>,Daniel Vetter <daniel@ffwll.ch>,dri-devel@lists.freedesktop.org,linux-kernel@vger.kernel.org,opensource.kernel@vivo.com
> Subject: Re:Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
>
>
>
>
> From: Liviu Dudau <liviu.dudau@arm.com>
> Date: 2020-04-24 19:09:50
> To: Bernard Zhao <bernard@vivo.com>
> Cc: Brian Starkey <brian.starkey@arm.com>,David Airlie <airlied@linux.ie>,Daniel Vetter <daniel@ffwll.ch>,dri-devel@lists.freedesktop.org,linux-kernel@vger.kernel.org,opensource.kernel@vivo.com
> Subject: Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format>Hi Bernand,
> >
> >On Thu, Apr 23, 2020 at 11:35:51PM -0700, Bernard Zhao wrote:
> >> The pixel clock is still enabled when the format is wrong.
> >> no error branch handle, and also some register is not set
> >> in this case, e.g: HDLCD_REG_<color>_SELECT. Maybe we
> >> should disable this clock and throw an warn message when
> >> this happened.
> >> With this change, the code maybe a bit more readable.
> >>
> >> Signed-off-by: Bernard Zhao <bernard@vivo.com>
> >>
> >> Changes since V1:
> >> *add format error handle, if format is not correct, throw
> >> an warning message and disable this clock.
> >>
> >> Link for V1:
> >> *https://lore.kernel.org/patchwork/patch/1228501/
> >> ---
> >> drivers/gpu/drm/arm/hdlcd_crtc.c | 13 +++++++++----
> >> 1 file changed, 9 insertions(+), 4 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/arm/hdlcd_crtc.c b/drivers/gpu/drm/arm/hdlcd_crtc.c
> >> index af67fefed38d..f3945dee2b7d 100644
> >> --- a/drivers/gpu/drm/arm/hdlcd_crtc.c
> >> +++ b/drivers/gpu/drm/arm/hdlcd_crtc.c
> >> @@ -96,7 +96,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
> >> }
> >>
> >> if (WARN_ON(!format))
> >> - return 0;
> >> + return -EINVAL;
> >
> >That is the right fix!
> >
> >>
> >> /* HDLCD uses 'bytes per pixel', zero means 1 byte */
> >> btpp = (format->bits_per_pixel + 7) / 8;
> >> @@ -125,7 +125,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
> >> return 0;
> >> }
> >>
> >> -static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
> >> +static int hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
> >
> >But this is not. We don't need to propagate the error further, just ....
> >
> >> {
> >> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
> >> struct drm_display_mode *m = &crtc->state->adjusted_mode;
> >> @@ -162,9 +162,10 @@ static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
> >>
> >> err = hdlcd_set_pxl_fmt(crtc);
> >> if (err)
> >> - return;
> >
>
> My previous understanding was that when such an exception occurred, it was caught
> in the atomic_enable interface, and then disable pixel clock. I am not sure is this ok or
> i have to do more register clean operaction.
>
> >... return here so that we don't call clk_set_rate();
> And for this part, i am a little confused :
> 1 clk_set_rate must be set even if format is wrong?
> 2 The original code logic shows that If format is not correct, we will not set registers
> HDLCD_REG_PIXEL_FORMAT & HDLCD_REG_<color>_SELECT, will this bring in
> any problems?
> 3 if 1 the rate must set & 2 registers above doesn`t matter, then maybe there is no
> need to disable pixel clock.
> Am i misunderstanding
You are right, the pixel format check should not happen inside hdlcd_crtc_atomic_enable()
hook, it should be moved into a separate function hdlcd_crtc_atomic_check() and that needs
to be hooked into .atomic_check() for hdlcd_crtc_helper_funcs().
If you want to have another go I'll be happy to review and Ack your patch.
Best regards,
Liviu
>
> Regards,
> Bernard
>
> >> + return err;
> >>
> >> clk_set_rate(hdlcd->clk, m->crtc_clock * 1000);
> >> + return 0;
> >> }
> >>
> >> static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
> >> @@ -173,7 +174,11 @@ static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
> >> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
> >>
> >> clk_prepare_enable(hdlcd->clk);
> >> - hdlcd_crtc_mode_set_nofb(crtc);
> >> + if (hdlcd_crtc_mode_set_nofb(crtc)) {
> >> + DRM_DEBUG_KMS("Invalid format, pixel clock enable failed!\n");
> >> + clk_disable_unprepare(hdlcd->clk);
> >> + return;
> >> + }
> >> hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 1);
> >> drm_crtc_vblank_on(crtc);
> >> }
> >> --
> >> 2.26.2
> >>
> >
> >--
> >====================
> >| I would like to |
> >| fix the world, |
> >| but they're not |
> >| giving me the |
> > \ source code! /
> > ---------------
> > ¯\_(ツ)_/¯
>
>
>
--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
¯\_(ツ)_/¯
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re:Re: Re:Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
2020-05-15 14:41 ` Liviu Dudau
@ 2020-05-18 4:06 ` Bernard
-1 siblings, 0 replies; 13+ messages in thread
From: Bernard @ 2020-05-18 4:06 UTC (permalink / raw)
To: Liviu Dudau
Cc: Brian Starkey, David Airlie, Daniel Vetter, dri-devel,
linux-kernel, opensource.kernel
发件人:Liviu Dudau <liviu.dudau@arm.com>
发送日期:2020-05-15 22:41:49
收件人:Bernard <bernard@vivo.com>
抄送人:Brian Starkey <brian.starkey@arm.com>,David Airlie <airlied@linux.ie>,Daniel Vetter <daniel@ffwll.ch>,dri-devel@lists.freedesktop.org,linux-kernel@vger.kernel.org,opensource.kernel@vivo.com
主题:Re: Re:Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format>Hi Bernard,
>
>On Fri, May 08, 2020 at 04:47:17PM +0800, Bernard wrote:
>> From: "赵军奎" <bernard@vivo.com>
>> Date: 2020-04-24 19:37:36
>> To: Liviu Dudau <liviu.dudau@arm.com>
>> Cc: Brian Starkey <brian.starkey@arm.com>,David Airlie <airlied@linux.ie>,Daniel Vetter <daniel@ffwll.ch>,dri-devel@lists.freedesktop.org,linux-kernel@vger.kernel.org,opensource.kernel@vivo.com
>> Subject: Re:Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
>>
>>
>>
>>
>> From: Liviu Dudau <liviu.dudau@arm.com>
>> Date: 2020-04-24 19:09:50
>> To: Bernard Zhao <bernard@vivo.com>
>> Cc: Brian Starkey <brian.starkey@arm.com>,David Airlie <airlied@linux.ie>,Daniel Vetter <daniel@ffwll.ch>,dri-devel@lists.freedesktop.org,linux-kernel@vger.kernel.org,opensource.kernel@vivo.com
>> Subject: Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format>Hi Bernand,
>> >
>> >On Thu, Apr 23, 2020 at 11:35:51PM -0700, Bernard Zhao wrote:
>> >> The pixel clock is still enabled when the format is wrong.
>> >> no error branch handle, and also some register is not set
>> >> in this case, e.g: HDLCD_REG_<color>_SELECT. Maybe we
>> >> should disable this clock and throw an warn message when
>> >> this happened.
>> >> With this change, the code maybe a bit more readable.
>> >>
>> >> Signed-off-by: Bernard Zhao <bernard@vivo.com>
>> >>
>> >> Changes since V1:
>> >> *add format error handle, if format is not correct, throw
>> >> an warning message and disable this clock.
>> >>
>> >> Link for V1:
>> >> *https://lore.kernel.org/patchwork/patch/1228501/
>> >> ---
>> >> drivers/gpu/drm/arm/hdlcd_crtc.c | 13 +++++++++----
>> >> 1 file changed, 9 insertions(+), 4 deletions(-)
>> >>
>> >> diff --git a/drivers/gpu/drm/arm/hdlcd_crtc.c b/drivers/gpu/drm/arm/hdlcd_crtc.c
>> >> index af67fefed38d..f3945dee2b7d 100644
>> >> --- a/drivers/gpu/drm/arm/hdlcd_crtc.c
>> >> +++ b/drivers/gpu/drm/arm/hdlcd_crtc.c
>> >> @@ -96,7 +96,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
>> >> }
>> >>
>> >> if (WARN_ON(!format))
>> >> - return 0;
>> >> + return -EINVAL;
>> >
>> >That is the right fix!
>> >
>> >>
>> >> /* HDLCD uses 'bytes per pixel', zero means 1 byte */
>> >> btpp = (format->bits_per_pixel + 7) / 8;
>> >> @@ -125,7 +125,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
>> >> return 0;
>> >> }
>> >>
>> >> -static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>> >> +static int hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>> >
>> >But this is not. We don't need to propagate the error further, just ....
>> >
>> >> {
>> >> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
>> >> struct drm_display_mode *m = &crtc->state->adjusted_mode;
>> >> @@ -162,9 +162,10 @@ static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>> >>
>> >> err = hdlcd_set_pxl_fmt(crtc);
>> >> if (err)
>> >> - return;
>> >
>>
>> My previous understanding was that when such an exception occurred, it was caught
>> in the atomic_enable interface, and then disable pixel clock. I am not sure is this ok or
>> i have to do more register clean operaction.
>>
>> >... return here so that we don't call clk_set_rate();
>> And for this part, i am a little confused :
>> 1 clk_set_rate must be set even if format is wrong?
>> 2 The original code logic shows that If format is not correct, we will not set registers
>> HDLCD_REG_PIXEL_FORMAT & HDLCD_REG_<color>_SELECT, will this bring in
>> any problems?
>> 3 if 1 the rate must set & 2 registers above doesn`t matter, then maybe there is no
>> need to disable pixel clock.
>> Am i misunderstanding
>
>You are right, the pixel format check should not happen inside hdlcd_crtc_atomic_enable()
>hook, it should be moved into a separate function hdlcd_crtc_atomic_check() and that needs
>to be hooked into .atomic_check() for hdlcd_crtc_helper_funcs().
>
>If you want to have another go I'll be happy to review and Ack your patch.
>
>Best regards,
>Liviu
>
Hi
Sure, i will check this and re-subbmit one patch.
Regards,
Bernard
>>
>> Regards,
>> Bernard
>>
>> >> + return err;
>> >>
>> >> clk_set_rate(hdlcd->clk, m->crtc_clock * 1000);
>> >> + return 0;
>> >> }
>> >>
>> >> static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
>> >> @@ -173,7 +174,11 @@ static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
>> >> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
>> >>
>> >> clk_prepare_enable(hdlcd->clk);
>> >> - hdlcd_crtc_mode_set_nofb(crtc);
>> >> + if (hdlcd_crtc_mode_set_nofb(crtc)) {
>> >> + DRM_DEBUG_KMS("Invalid format, pixel clock enable failed!\n");
>> >> + clk_disable_unprepare(hdlcd->clk);
>> >> + return;
>> >> + }
>> >> hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 1);
>> >> drm_crtc_vblank_on(crtc);
>> >> }
>> >> --
>> >> 2.26.2
>> >>
>> >
>> >--
>> >====================
>> >| I would like to |
>> >| fix the world, |
>> >| but they're not |
>> >| giving me the |
>> > \ source code! /
>> > ---------------
>> > ¯\_(ツ)_/¯
>>
>>
>>
>
>--
>====================
>| I would like to |
>| fix the world, |
>| but they're not |
>| giving me the |
> \ source code! /
> ---------------
> ¯\_(ツ)_/¯
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re:Re: Re:Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
@ 2020-05-18 4:06 ` Bernard
0 siblings, 0 replies; 13+ messages in thread
From: Bernard @ 2020-05-18 4:06 UTC (permalink / raw)
To: Liviu Dudau; +Cc: opensource.kernel, David Airlie, linux-kernel, dri-devel
发件人:Liviu Dudau <liviu.dudau@arm.com>
发送日期:2020-05-15 22:41:49
收件人:Bernard <bernard@vivo.com>
抄送人:Brian Starkey <brian.starkey@arm.com>,David Airlie <airlied@linux.ie>,Daniel Vetter <daniel@ffwll.ch>,dri-devel@lists.freedesktop.org,linux-kernel@vger.kernel.org,opensource.kernel@vivo.com
主题:Re: Re:Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format>Hi Bernard,
>
>On Fri, May 08, 2020 at 04:47:17PM +0800, Bernard wrote:
>> From: "赵军奎" <bernard@vivo.com>
>> Date: 2020-04-24 19:37:36
>> To: Liviu Dudau <liviu.dudau@arm.com>
>> Cc: Brian Starkey <brian.starkey@arm.com>,David Airlie <airlied@linux.ie>,Daniel Vetter <daniel@ffwll.ch>,dri-devel@lists.freedesktop.org,linux-kernel@vger.kernel.org,opensource.kernel@vivo.com
>> Subject: Re:Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format
>>
>>
>>
>>
>> From: Liviu Dudau <liviu.dudau@arm.com>
>> Date: 2020-04-24 19:09:50
>> To: Bernard Zhao <bernard@vivo.com>
>> Cc: Brian Starkey <brian.starkey@arm.com>,David Airlie <airlied@linux.ie>,Daniel Vetter <daniel@ffwll.ch>,dri-devel@lists.freedesktop.org,linux-kernel@vger.kernel.org,opensource.kernel@vivo.com
>> Subject: Re: [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format>Hi Bernand,
>> >
>> >On Thu, Apr 23, 2020 at 11:35:51PM -0700, Bernard Zhao wrote:
>> >> The pixel clock is still enabled when the format is wrong.
>> >> no error branch handle, and also some register is not set
>> >> in this case, e.g: HDLCD_REG_<color>_SELECT. Maybe we
>> >> should disable this clock and throw an warn message when
>> >> this happened.
>> >> With this change, the code maybe a bit more readable.
>> >>
>> >> Signed-off-by: Bernard Zhao <bernard@vivo.com>
>> >>
>> >> Changes since V1:
>> >> *add format error handle, if format is not correct, throw
>> >> an warning message and disable this clock.
>> >>
>> >> Link for V1:
>> >> *https://lore.kernel.org/patchwork/patch/1228501/
>> >> ---
>> >> drivers/gpu/drm/arm/hdlcd_crtc.c | 13 +++++++++----
>> >> 1 file changed, 9 insertions(+), 4 deletions(-)
>> >>
>> >> diff --git a/drivers/gpu/drm/arm/hdlcd_crtc.c b/drivers/gpu/drm/arm/hdlcd_crtc.c
>> >> index af67fefed38d..f3945dee2b7d 100644
>> >> --- a/drivers/gpu/drm/arm/hdlcd_crtc.c
>> >> +++ b/drivers/gpu/drm/arm/hdlcd_crtc.c
>> >> @@ -96,7 +96,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
>> >> }
>> >>
>> >> if (WARN_ON(!format))
>> >> - return 0;
>> >> + return -EINVAL;
>> >
>> >That is the right fix!
>> >
>> >>
>> >> /* HDLCD uses 'bytes per pixel', zero means 1 byte */
>> >> btpp = (format->bits_per_pixel + 7) / 8;
>> >> @@ -125,7 +125,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
>> >> return 0;
>> >> }
>> >>
>> >> -static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>> >> +static int hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>> >
>> >But this is not. We don't need to propagate the error further, just ....
>> >
>> >> {
>> >> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
>> >> struct drm_display_mode *m = &crtc->state->adjusted_mode;
>> >> @@ -162,9 +162,10 @@ static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
>> >>
>> >> err = hdlcd_set_pxl_fmt(crtc);
>> >> if (err)
>> >> - return;
>> >
>>
>> My previous understanding was that when such an exception occurred, it was caught
>> in the atomic_enable interface, and then disable pixel clock. I am not sure is this ok or
>> i have to do more register clean operaction.
>>
>> >... return here so that we don't call clk_set_rate();
>> And for this part, i am a little confused :
>> 1 clk_set_rate must be set even if format is wrong?
>> 2 The original code logic shows that If format is not correct, we will not set registers
>> HDLCD_REG_PIXEL_FORMAT & HDLCD_REG_<color>_SELECT, will this bring in
>> any problems?
>> 3 if 1 the rate must set & 2 registers above doesn`t matter, then maybe there is no
>> need to disable pixel clock.
>> Am i misunderstanding
>
>You are right, the pixel format check should not happen inside hdlcd_crtc_atomic_enable()
>hook, it should be moved into a separate function hdlcd_crtc_atomic_check() and that needs
>to be hooked into .atomic_check() for hdlcd_crtc_helper_funcs().
>
>If you want to have another go I'll be happy to review and Ack your patch.
>
>Best regards,
>Liviu
>
Hi
Sure, i will check this and re-subbmit one patch.
Regards,
Bernard
>>
>> Regards,
>> Bernard
>>
>> >> + return err;
>> >>
>> >> clk_set_rate(hdlcd->clk, m->crtc_clock * 1000);
>> >> + return 0;
>> >> }
>> >>
>> >> static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
>> >> @@ -173,7 +174,11 @@ static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
>> >> struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
>> >>
>> >> clk_prepare_enable(hdlcd->clk);
>> >> - hdlcd_crtc_mode_set_nofb(crtc);
>> >> + if (hdlcd_crtc_mode_set_nofb(crtc)) {
>> >> + DRM_DEBUG_KMS("Invalid format, pixel clock enable failed!\n");
>> >> + clk_disable_unprepare(hdlcd->clk);
>> >> + return;
>> >> + }
>> >> hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 1);
>> >> drm_crtc_vblank_on(crtc);
>> >> }
>> >> --
>> >> 2.26.2
>> >>
>> >
>> >--
>> >====================
>> >| I would like to |
>> >| fix the world, |
>> >| but they're not |
>> >| giving me the |
>> > \ source code! /
>> > ---------------
>> > ¯\_(ツ)_/¯
>>
>>
>>
>
>--
>====================
>| I would like to |
>| fix the world, |
>| but they're not |
>| giving me the |
> \ source code! /
> ---------------
> ¯\_(ツ)_/¯
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 13+ messages in thread
end of thread, other threads:[~2020-05-18 10:14 UTC | newest]
Thread overview: 13+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-04-24 6:35 [PATCH v2] drm/arm: fixes pixel clock enabled with wrong format Bernard Zhao
2020-04-24 6:35 ` Bernard Zhao
2020-04-24 11:00 ` Emil Velikov
2020-04-24 11:00 ` Emil Velikov
2020-04-24 11:09 ` Liviu Dudau
2020-04-24 11:09 ` Liviu Dudau
2020-04-24 11:37 ` 赵军奎
2020-05-08 8:47 ` Bernard
2020-05-08 8:47 ` Bernard
2020-05-15 14:41 ` Liviu Dudau
2020-05-15 14:41 ` Liviu Dudau
2020-05-18 4:06 ` Bernard
2020-05-18 4:06 ` Bernard
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