[PATCH v1 5/7] drm/mediatek: Drop chain_mode_fixup call in mode_valid()

Sam Ravnborg
2021-07-22T06:25:33Z

The mode_valid implementation had a call to
drm_bridge_chain_mode_fixup() which would be wrong as the mode_valid is
not allowed to change anything - only to validate the mode.

As the next bridge is often/always a connector the call had no effect
anyway. So drop it.

From the git history I could see this call was included in the original
version of the driver so there was no help there to find out why it was
added in the first place. But a lot has changed since the initial driver
were added and is seems safe to remove the call now.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Cc: linux-mediatek@lists.infradead.org
Cc: linux-arm-kernel@lists.infradead.org
---
drivers/gpu/drm/mediatek/mtk_hdmi.c | 11 -----------
1 file changed, 11 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index dea46d66e712..c45e4dbd9a2f 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -1206,22 +1206,11 @@ static int mtk_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
const struct drm_display_mode *mode)
{
struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
- struct drm_bridge *next_bridge;

dev_dbg(hdmi->dev, "xres=%d, yres=%d, refresh=%d, intl=%d clock=%d\n",
mode->hdisplay, mode->vdisplay, drm_mode_vrefresh(mode),
!!(mode->flags & DRM_MODE_FLAG_INTERLACE), mode->clock * 1000);

- next_bridge = drm_bridge_get_next_bridge(&hdmi->bridge);
- if (next_bridge) {
- struct drm_display_mode adjusted_mode;
-
- drm_mode_copy(&adjusted_mode, mode);
- if (!drm_bridge_chain_mode_fixup(next_bridge, mode,
- &adjusted_mode))
- return MODE_BAD;
- }
-
if (mode->clock < 27000)
return MODE_CLOCK_LOW;
if (mode->clock > 297000)
--
2.30.2