[PATCH] drm: meson: venc: cvbs: fix CVBS mode matching

[PATCH] drm: meson: venc: cvbs: fix CVBS mode matching

[Martin Blumenstingl]

Drop the picture_aspect_ratio from the drm_display_modes which are valid
for the Amlogic Meson CVBS encoder. meson_venc_cvbs_encoder_atomic_check
and meson_venc_cvbs_encoder_mode_set only support two very specific
drm_display_modes.

With commit 222ec1618c3ace ("drm: Add aspect ratio parsing in DRM
layer") the drm core started honoring the picture_aspect_ratio field
when comparing two drm_display_modes. Prior to that it was ignored.
When the CVBS encoder driver was initially submitted there was no aspect
ratio check.

This patch fixes "kmscube" and X.org output using the CVBS connector
with the Amlogic Meson VPU driver. Prior to this patch kmscube reported:
  failed to set mode: Invalid argument
Additionally it makes the CVBS mode checking behave identical to the
sun4i (drivers/gpu/drm/sun4i/sun4i_tv.c sun4i_tv_mode_to_drm_mode) and
ZTE (drivers/gpu/drm/zte/zx_tvenc.c tvenc_mode_{pal,ntsc}) which are
both not setting "picture_aspect_ratio" either.

Fixes: 222ec1618c3ace ("drm: Add aspect ratio parsing in DRM layer")
Fixes: bbbe775ec5b5da ("drm: Add support for Amlogic Meson Graphic Controller")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 drivers/gpu/drm/meson/meson_venc_cvbs.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/gpu/drm/meson/meson_venc_cvbs.c b/drivers/gpu/drm/meson/meson_venc_cvbs.c
index 9ab27aecfcf3..2ddcda8fa5b0 100644
--- a/drivers/gpu/drm/meson/meson_venc_cvbs.c
+++ b/drivers/gpu/drm/meson/meson_venc_cvbs.c
@@ -49,7 +49,6 @@ struct meson_cvbs_mode meson_cvbs_modes[MESON_CVBS_MODES_COUNT] = {
 				 720, 732, 795, 864, 0, 576, 580, 586, 625, 0,
 				 DRM_MODE_FLAG_INTERLACE),
 			.vrefresh = 50,
-			.picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3,
 		},
 	},
 	{ /* NTSC */
@@ -59,7 +58,6 @@ struct meson_cvbs_mode meson_cvbs_modes[MESON_CVBS_MODES_COUNT] = {
 				720, 739, 801, 858, 0, 480, 488, 494, 525, 0,
 				DRM_MODE_FLAG_INTERLACE),
 			.vrefresh = 60,
-			.picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3,
 		},
 	},
 };
-- 
2.24.0


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Re: [PATCH] drm: meson: venc: cvbs: fix CVBS mode matching

[Neil Armstrong]

Hi Martin,

On 30/11/2019 23:25, Martin Blumenstingl wrote:
> Drop the picture_aspect_ratio from the drm_display_modes which are valid
> for the Amlogic Meson CVBS encoder. meson_venc_cvbs_encoder_atomic_check
> and meson_venc_cvbs_encoder_mode_set only support two very specific
> drm_display_modes.
> 
> With commit 222ec1618c3ace ("drm: Add aspect ratio parsing in DRM
> layer") the drm core started honoring the picture_aspect_ratio field
> when comparing two drm_display_modes. Prior to that it was ignored.
> When the CVBS encoder driver was initially submitted there was no aspect
> ratio check.
> 
> This patch fixes "kmscube" and X.org output using the CVBS connector
> with the Amlogic Meson VPU driver. Prior to this patch kmscube reported:
>   failed to set mode: Invalid argument
> Additionally it makes the CVBS mode checking behave identical to the
> sun4i (drivers/gpu/drm/sun4i/sun4i_tv.c sun4i_tv_mode_to_drm_mode) and
> ZTE (drivers/gpu/drm/zte/zx_tvenc.c tvenc_mode_{pal,ntsc}) which are
> both not setting "picture_aspect_ratio" either.
> 
> Fixes: 222ec1618c3ace ("drm: Add aspect ratio parsing in DRM layer")
> Fixes: bbbe775ec5b5da ("drm: Add support for Amlogic Meson Graphic Controller")
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> ---
>  drivers/gpu/drm/meson/meson_venc_cvbs.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/meson/meson_venc_cvbs.c b/drivers/gpu/drm/meson/meson_venc_cvbs.c
> index 9ab27aecfcf3..2ddcda8fa5b0 100644
> --- a/drivers/gpu/drm/meson/meson_venc_cvbs.c
> +++ b/drivers/gpu/drm/meson/meson_venc_cvbs.c
> @@ -49,7 +49,6 @@ struct meson_cvbs_mode meson_cvbs_modes[MESON_CVBS_MODES_COUNT] = {
>  				 720, 732, 795, 864, 0, 576, 580, 586, 625, 0,
>  				 DRM_MODE_FLAG_INTERLACE),
>  			.vrefresh = 50,
> -			.picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3,
>  		},
>  	},
>  	{ /* NTSC */
> @@ -59,7 +58,6 @@ struct meson_cvbs_mode meson_cvbs_modes[MESON_CVBS_MODES_COUNT] = {
>  				720, 739, 801, 858, 0, 480, 488, 494, 525, 0,
>  				DRM_MODE_FLAG_INTERLACE),
>  			.vrefresh = 60,
> -			.picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3,
>  		},
>  	},
>  };
> 

Thanks for finding this issue !!

I would rather prefer changing the drm_mode_equal to drm_mode_match without DRM_MODE_MATCH_ASPECT_RATIO.

Neil

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