[PATCH 1/1] drm/imx/ipuv-v3: Fix front porch adjustment upon hactive aligning

[PATCH 1/1] drm/imx/ipuv-v3: Fix front porch adjustment upon hactive aligning

[Alexander Stein]

When hactive is not aligned to 8 pixels, it is aligned accordingly and
hfront porch needs to be reduced the same amount. Unfortunately the front
porch is set to the difference rather than reducing it. There are some
Samsung TVs which can't cope with a front porch of instead of 70.

Fixes: 94dfec48fca7 ("drm/imx: Add 8 pixel alignment fix")
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
---
AFAICS ipu_di_adjust_videomode() checks that front porch is big enough to
reduce the alignment difference.

 drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c b/drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c
index 1d306f7be9fd..341e9125bf2c 100644
--- a/drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c
+++ b/drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c
@@ -311,7 +311,7 @@ static void ipu_crtc_mode_set_nofb(struct drm_crtc *crtc)
 			 sig_cfg.mode.hactive, new_hactive);
 
 		dev_info(ipu_crtc->dev, "hfront_porch: %u\n", sig_cfg.mode.hfront_porch);
-		sig_cfg.mode.hfront_porch = new_hactive - sig_cfg.mode.hactive;
+		sig_cfg.mode.hfront_porch -= new_hactive - sig_cfg.mode.hactive;
 		dev_info(ipu_crtc->dev, "hfront_porch: %u\n", sig_cfg.mode.hfront_porch);
 		sig_cfg.mode.hactive = new_hactive;
 	}
-- 
2.34.1


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Re: [PATCH 1/1] drm/imx/ipuv-v3: Fix front porch adjustment upon hactive aligning

[Ian Ray]

On Wed, May 03, 2023 at 01:14:56PM +0200, Alexander Stein wrote:
> When hactive is not aligned to 8 pixels, it is aligned accordingly and
> hfront porch needs to be reduced the same amount. Unfortunately the front
> porch is set to the difference rather than reducing it. There are some
> Samsung TVs which can't cope with a front porch of instead of 70.
> 
> Fixes: 94dfec48fca7 ("drm/imx: Add 8 pixel alignment fix")
> Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>

Tested on the same 1366x768 display hardware that required the original                                                                                                                                                                                                         
fix in commit 94dfec48fca7.                                                                                                                                                                                                                                                     
                                                                                                                                                                                                                                                                                
Tested-by: Ian Ray <ian.ray@ge.com>                                                                                                                                                                                                                                             


> ---
> AFAICS ipu_di_adjust_videomode() checks that front porch is big enough to
> reduce the alignment difference.
> 
>  drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c b/drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c
> index 1d306f7be9fd..341e9125bf2c 100644
> --- a/drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c
> +++ b/drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c
> @@ -311,7 +311,7 @@ static void ipu_crtc_mode_set_nofb(struct drm_crtc *crtc)
>                          sig_cfg.mode.hactive, new_hactive);
>  
>                 dev_info(ipu_crtc->dev, "hfront_porch: %u\n", sig_cfg.mode.hfront_porch);
> -               sig_cfg.mode.hfront_porch = new_hactive - sig_cfg.mode.hactive;
> +               sig_cfg.mode.hfront_porch -= new_hactive - sig_cfg.mode.hactive;
>                 dev_info(ipu_crtc->dev, "hfront_porch: %u\n", sig_cfg.mode.hfront_porch);
>                 sig_cfg.mode.hactive = new_hactive;
>         }
> -- 
> 2.34.1
> 

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Re: [PATCH 1/1] drm/imx/ipuv-v3: Fix front porch adjustment upon hactive aligning

[Alexander Stein]

Hi,

Am Mittwoch, 3. Mai 2023, 13:14:56 CEST schrieb Alexander Stein:
> When hactive is not aligned to 8 pixels, it is aligned accordingly and
> hfront porch needs to be reduced the same amount. Unfortunately the front
> porch is set to the difference rather than reducing it. There are some
> Samsung TVs which can't cope with a front porch of instead of 70.
> 
> Fixes: 94dfec48fca7 ("drm/imx: Add 8 pixel alignment fix")
> Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> ---
> AFAICS ipu_di_adjust_videomode() checks that front porch is big enough to
> reduce the alignment difference.

A gentle ping. Is there anything to do? Or is someone picking this patch was 
tested by Ian?

Best regards,
Alexander

>  drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c
> b/drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c index 1d306f7be9fd..341e9125bf2c
> 100644
> --- a/drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c
> +++ b/drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c
> @@ -311,7 +311,7 @@ static void ipu_crtc_mode_set_nofb(struct drm_crtc
> *crtc) sig_cfg.mode.hactive, new_hactive);
> 
>  		dev_info(ipu_crtc->dev, "hfront_porch: %u\n", 
sig_cfg.mode.hfront_porch);
> -		sig_cfg.mode.hfront_porch = new_hactive - 
sig_cfg.mode.hactive;
> +		sig_cfg.mode.hfront_porch -= new_hactive - 
sig_cfg.mode.hactive;
> dev_info(ipu_crtc->dev, "hfront_porch: %u\n", sig_cfg.mode.hfront_porch);
> sig_cfg.mode.hactive = new_hactive;
>  	}


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Re: [PATCH 1/1] drm/imx/ipuv-v3: Fix front porch adjustment upon hactive aligning

[Philipp Zabel]

On Mi, 2023-05-03 at 13:14 +0200, Alexander Stein wrote:
> When hactive is not aligned to 8 pixels, it is aligned accordingly and
> hfront porch needs to be reduced the same amount. Unfortunately the front
> porch is set to the difference rather than reducing it. There are some
> Samsung TVs which can't cope with a front porch of instead of 70.
> 
> Fixes: 94dfec48fca7 ("drm/imx: Add 8 pixel alignment fix")
> Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>

Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>

regards
Philipp

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Re: [PATCH 1/1] drm/imx/ipuv-v3: Fix front porch adjustment upon hactive aligning

[Philipp Zabel]

On Fr, 2023-07-21 at 10:36 +0200, Alexander Stein wrote:
> Hi,
> 
> Am Mittwoch, 3. Mai 2023, 13:14:56 CEST schrieb Alexander Stein:
> > When hactive is not aligned to 8 pixels, it is aligned accordingly and
> > hfront porch needs to be reduced the same amount. Unfortunately the front
> > porch is set to the difference rather than reducing it. There are some
> > Samsung TVs which can't cope with a front porch of instead of 70.
> > 
> > Fixes: 94dfec48fca7 ("drm/imx: Add 8 pixel alignment fix")
> > Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> > ---
> > AFAICS ipu_di_adjust_videomode() checks that front porch is big enough to
> > reduce the alignment difference.
> 
> A gentle ping. Is there anything to do? Or is someone picking this patch was 
> tested by Ian?

Thank you, pushed to drm-misc-fixes with the subject changed to:
"drm/imx/ipuv3: Fix front porch adjustment upon hactive aligning".

regards
Philipp

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