6.17-stable review patch. If anyone has any objections, please let me know.

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From: Devarsh Thakkar devarsht@ti.com

[ Upstream commit d6732ef4ab252e5753be7acad87b0a91cfd06953 ]

The sii902x driver was caching HDMI detection state in a sink_is_hdmi field and checking it in mode_set() to determine whether to set HDMI or DVI output mode. This approach had two problems:

1. With DRM_BRIDGE_ATTACH_NO_CONNECTOR (used by modern display drivers like TIDSS), the bridge's get_modes() is never called. Instead, the drm_bridge_connector helper calls the bridge's edid_read() and updates the connector itself. This meant sink_is_hdmi was never populated, causing the driver to default to DVI mode and breaking HDMI audio.

2. The mode_set() callback doesn't receive atomic state or connector pointer, making it impossible to check connector->display_info.is_hdmi directly at that point.

Fix this by moving the HDMI vs DVI decision from mode_set() to atomic_enable(), where we can access the connector via drm_atomic_get_new_connector_for_encoder(). This works for both connector models:

- With DRM_BRIDGE_ATTACH_NO_CONNECTOR: Returns the drm_bridge_connector created by the display driver, which has already been updated by the helper's call to drm_edid_connector_update()

- Without DRM_BRIDGE_ATTACH_NO_CONNECTOR (legacy): Returns the connector embedded in sii902x struct, which gets updated by the bridge's own get_modes()

Fixes: 3de47e1309c2 ("drm/bridge: sii902x: use display info is_hdmi") Signed-off-by: Devarsh Thakkar devarsht@ti.com Reviewed-by: Tomi Valkeinen tomi.valkeinen@ideasonboard.com Signed-off-by: Neil Armstrong neil.armstrong@linaro.org Link: https://patch.msgid.link/20251030151635.3019864-1-devarsht@ti.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/bridge/sii902x.c | 20 ++++++++------------ 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c index d537b1d036fb0..1f0aba28ad1e1 100644 --- a/drivers/gpu/drm/bridge/sii902x.c +++ b/drivers/gpu/drm/bridge/sii902x.c @@ -179,7 +179,6 @@ struct sii902x { struct drm_connector connector; struct gpio_desc *reset_gpio; struct i2c_mux_core *i2cmux; - bool sink_is_hdmi; u32 bus_width;

/* @@ -315,8 +314,6 @@ static int sii902x_get_modes(struct drm_connector *connector) drm_edid_free(drm_edid); }

- sii902x->sink_is_hdmi = connector->display_info.is_hdmi; - return num; }

@@ -342,9 +339,17 @@ static void sii902x_bridge_atomic_enable(struct drm_bridge *bridge, struct drm_atomic_state *state) { struct sii902x *sii902x = bridge_to_sii902x(bridge); + struct drm_connector *connector; + u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI; + + connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder); + if (connector && connector->display_info.is_hdmi) + output_mode = SII902X_SYS_CTRL_OUTPUT_HDMI;

mutex_lock(&sii902x->mutex);

+ regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA, + SII902X_SYS_CTRL_OUTPUT_MODE, output_mode); regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL, SII902X_AVI_POWER_STATE_MSK, SII902X_AVI_POWER_STATE_D(0)); @@ -359,16 +364,12 @@ static void sii902x_bridge_mode_set(struct drm_bridge *bridge, const struct drm_display_mode *adj) { struct sii902x *sii902x = bridge_to_sii902x(bridge); - u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI; struct regmap *regmap = sii902x->regmap; u8 buf[HDMI_INFOFRAME_SIZE(AVI)]; struct hdmi_avi_infoframe frame; u16 pixel_clock_10kHz = adj->clock / 10; int ret;

- if (sii902x->sink_is_hdmi) - output_mode = SII902X_SYS_CTRL_OUTPUT_HDMI; - buf[0] = pixel_clock_10kHz & 0xff; buf[1] = pixel_clock_10kHz >> 8; buf[2] = drm_mode_vrefresh(adj); @@ -384,11 +385,6 @@ static void sii902x_bridge_mode_set(struct drm_bridge *bridge,

mutex_lock(&sii902x->mutex);

- ret = regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA, - SII902X_SYS_CTRL_OUTPUT_MODE, output_mode); - if (ret) - goto out; - ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10); if (ret) goto out;