linux-kernel - [PATCH v3 1/3] drm/bridge: dw-hdmi: change YUV420 selection logic at clock setup

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Message-Id: <6230bfae2cd97cf6527fc62ba5c850464919ccf8.1687702042.git.adrian.larumbe@collabora.com>
Date:   Sun, 25 Jun 2023 15:17:15 +0100
From:   Adrián Larumbe <adrian.larumbe@...labora.com>
To:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     Adrián Larumbe <adrian.larumbe@...labora.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v3 1/3] drm/bridge: dw-hdmi: change YUV420 selection logic at clock setup

Right now clocking value selection code is prioritising RGB, YUV444 modes
over YUV420 for HDMI2 sinks. However, because of the bus format selection
procedure in dw-hdmi, for HDMI2 sinks YUV420 is the format that will always
be picked during the drm bridge chain check stage.

Later on dw_hdmi_setup will configure a colour space based on the bus
format that doesn't match the pixel value we had calculated as described
above.

Fix it by bringing back dw-hdmi bus format check when picking the right
pixel clock.

Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>
Acked-by: Neil Armstrong <neil.armstrong@...aro.org>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 6 ++++++
 drivers/gpu/drm/meson/meson_dw_hdmi.c     | 4 ++--
 include/drm/bridge/dw_hdmi.h              | 2 ++
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 3b40e0fdca5c..e6a456b72610 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -3346,6 +3346,12 @@ static int dw_hdmi_parse_dt(struct dw_hdmi *hdmi)
 	return 0;
 }
 
+bool dw_hdmi_bus_fmt_is_420(struct dw_hdmi *hdmi)
+{
+	return hdmi_bus_fmt_is_yuv420(hdmi->hdmi_data.enc_out_bus_format);
+}
+EXPORT_SYMBOL_GPL(dw_hdmi_bus_fmt_is_420);
+
 struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev,
 			      const struct dw_hdmi_plat_data *plat_data)
 {
diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
index 3d046878ce6c..b49bb0d86efe 100644
--- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
+++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
@@ -379,8 +379,8 @@ static int dw_hdmi_phy_init(struct dw_hdmi *hdmi, void *data,
 			 mode->clock > 340000 ? 40 : 10);
 
 	if (drm_mode_is_420_only(display, mode) ||
-	    (!is_hdmi2_sink &&
-	     drm_mode_is_420_also(display, mode)))
+	    (!is_hdmi2_sink && drm_mode_is_420_also(display, mode)) ||
+	    dw_hdmi_bus_fmt_is_420(hdmi))
 		mode_is_420 = true;
 
 	/* Enable clocks */
diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
index f668e75fbabe..6a46baa0737c 100644
--- a/include/drm/bridge/dw_hdmi.h
+++ b/include/drm/bridge/dw_hdmi.h
@@ -206,4 +206,6 @@ void dw_hdmi_phy_update_hpd(struct dw_hdmi *hdmi, void *data,
 			    bool force, bool disabled, bool rxsense);
 void dw_hdmi_phy_setup_hpd(struct dw_hdmi *hdmi, void *data);
 
+bool dw_hdmi_bus_fmt_is_420(struct dw_hdmi *hdmi);
+
 #endif /* __IMX_HDMI_H__ */
-- 
2.40.0