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

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[ Upstream commit ee31742bf1 ]

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: 94dfec48fc ("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
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexander Stein
2023-05-15 09:21:37 +02:00
committed by Greg Kroah-Hartman
parent 5058c14440
commit 0f1f471b91
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/imx/ipuv3-crtc.c
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@@ -311,7 +311,7 @@ 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;
}