linux-kernel - [PATCH v7 2/7] drm/msm/hdmi: program HDMI timings during atomic_pre

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Message-Id: <20250208-bridge-hdmi-connector-v7-2-0c3837f00258@linaro.org>
Date: Sat, 08 Feb 2025 02:27:01 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
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>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Rob Clark <robdclark@...il.com>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 Simona Vetter <simona@...ll.ch>, Simona Vetter <simona.vetter@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v7 2/7] drm/msm/hdmi: program HDMI timings during
 atomic_pre_enable

The mode_set callback is deprecated, it doesn't get the
drm_bridge_state, just mode-related argumetns. Also Abhinav pointed out
that HDMI timings should be programmed after setting up HDMI PHY and
PLL. Rework the code to program HDMI timings at the end of
atomic_pre_enable().

Reviewed-by: Maxime Ripard <mripard@...nel.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/gpu/drm/msm/hdmi/hdmi_bridge.c | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
index d839c71091dcdc3b020fcbba8d698d58ee7fc749..bd94b3a70f0e5e457a88f089b491103a8c09567b 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
@@ -126,15 +126,29 @@ static void msm_hdmi_config_avi_infoframe(struct hdmi *hdmi)
 	hdmi_write(hdmi, REG_HDMI_INFOFRAME_CTRL1, val);
 }
 
+static void msm_hdmi_set_timings(struct hdmi *hdmi,
+				 const struct drm_display_mode *mode);
+
 static void msm_hdmi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
 					      struct drm_bridge_state *old_bridge_state)
 {
+	struct drm_atomic_state *state = old_bridge_state->base.state;
 	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
 	struct hdmi *hdmi = hdmi_bridge->hdmi;
 	struct hdmi_phy *phy = hdmi->phy;
+	struct drm_encoder *encoder = bridge->encoder;
+	struct drm_connector *connector;
+	struct drm_connector_state *conn_state;
+	struct drm_crtc_state *crtc_state;
 
 	DBG("power up");
 
+	connector = drm_atomic_get_new_connector_for_encoder(state, encoder);
+	conn_state = drm_atomic_get_new_connector_state(state, connector);
+	crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
+
+	msm_hdmi_set_timings(hdmi, &crtc_state->adjusted_mode);
+
 	if (!hdmi->power_on) {
 		msm_hdmi_phy_resource_enable(phy);
 		msm_hdmi_power_on(bridge);
@@ -177,17 +191,12 @@ static void msm_hdmi_bridge_atomic_post_disable(struct drm_bridge *bridge,
 	}
 }
 
-static void msm_hdmi_bridge_mode_set(struct drm_bridge *bridge,
-		 const struct drm_display_mode *mode,
-		 const struct drm_display_mode *adjusted_mode)
+static void msm_hdmi_set_timings(struct hdmi *hdmi,
+				 const struct drm_display_mode *mode)
 {
-	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
-	struct hdmi *hdmi = hdmi_bridge->hdmi;
 	int hstart, hend, vstart, vend;
 	uint32_t frame_ctrl;
 
-	mode = adjusted_mode;
-
 	hdmi->pixclock = mode->clock * 1000;
 
 	hstart = mode->htotal - mode->hsync_start;
@@ -306,7 +315,6 @@ static const struct drm_bridge_funcs msm_hdmi_bridge_funcs = {
 	.atomic_reset = drm_atomic_helper_bridge_reset,
 	.atomic_pre_enable = msm_hdmi_bridge_atomic_pre_enable,
 	.atomic_post_disable = msm_hdmi_bridge_atomic_post_disable,
-	.mode_set = msm_hdmi_bridge_mode_set,
 	.mode_valid = msm_hdmi_bridge_mode_valid,
 	.edid_read = msm_hdmi_bridge_edid_read,
 	.detect = msm_hdmi_bridge_detect,

-- 
2.39.5