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drm/imx/ipuv3: Fix front porch adjustment upon hactive aligning

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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>
Link: https://lore.kernel.org/r/20230515072137.116211-1-alexander.stein@ew.tq-group.com
[p.zabel@pengutronix.de: Fixed subject]
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230515072137.116211-1-alexander.stein@ew.tq-group.com
This commit is contained in:
Alexander Stein 2023-05-15 09:21:37 +02:00 committed by Philipp Zabel
parent 2dedcf414b
commit ee31742bf1
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c
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@ -310,7 +310,7 @@ static void ipu_crtc_mode_set_nofb(struct drm_crtc *crtc)
dev_warn(ipu_crtc->dev, "8-pixel align hactive %d -> %d\n",
sig_cfg.mode.hactive, new_hactive);
sig_cfg.mode.hfront_porch = new_hactive - sig_cfg.mode.hactive;
sig_cfg.mode.hfront_porch -= new_hactive - sig_cfg.mode.hactive;
sig_cfg.mode.hactive = new_hactive;
}