drm/mediatek: Drop chain_mode_fixup call in mode_valid()

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.

v4:
  - Link to v3: https://lore.kernel.org/dri-devel/20220717174454.46616-4-sam@ravnborg.org/
  - Rebase, and added acks/rb
v3:
  - Link to v2: https://lore.kernel.org/dri-devel/20211020181901.2114645-6-sam@ravnborg.org/
v2:
  - Link to v1: https://lore.kernel.org/dri-devel/20210722062246.2512666-6-sam@ravnborg.org/

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Chun-Kuang Hu <chunkuang.hu@kernel.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
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240531-bridge_chain_mode-v1-1-8b49e36c5dd3@ravnborg.org

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 6e1cca97a654d4397dc5b562a38fedb4a33498e2..0a90fe448d14595de68916df933f21151231ced3 100644 (file)
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -1208,22 +1208,11 @@ 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_init(&adjusted_mode, mode);
-               if (!drm_bridge_chain_mode_fixup(next_bridge, mode,
-                                                &adjusted_mode))
-                       return MODE_BAD;
-       }
-
        if (hdmi->conf) {
                if (hdmi->conf->cea_modes_only && !drm_match_cea_mode(mode))
                        return MODE_BAD;