From: Alexander Stein alexander.stein@ew.tq-group.com

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-grou... [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-alexan... --- 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 5f26090b0c98..89585b31b985 100644 --- a/drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c +++ b/drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c @@ -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; }