From b4fa0800760c20fe34318a1079687526fc323572 Mon Sep 17 00:00:00 2001
From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Date: Tue, 24 Dec 2024 03:48:01 +0200
Subject: [PATCH] drm/vc4: hdmi: stop rereading EDID in get_modes()
The vc4_hdmi_connector_detect_ctx() via vc4_hdmi_handle_hotplug()
already reads EDID and propagates it to the drm_connector. Stop
rereading EDID as a part of the .get_modes() callback and just update
the list of modes. This matches the behaviour of the i915 driver.
Acked-by: Maxime Ripard <mripard@kernel.org>
Tested-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241224-drm-bridge-hdmi-connector-v10-9-dc89577cd438@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
drivers/gpu/drm/vc4/vc4_hdmi.c | 21 ---------------------
1 file changed, 21 deletions(-)
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index cc5fdb23f76f4..4949171c28876 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -471,31 +471,10 @@ static int vc4_hdmi_connector_detect_ctx(struct drm_connector *connector,
static int vc4_hdmi_connector_get_modes(struct drm_connector *connector)
{
- struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector);
struct vc4_dev *vc4 = to_vc4_dev(connector->dev);
- const struct drm_edid *drm_edid;
int ret = 0;
- /*
- * NOTE: This function should really take vc4_hdmi->mutex, but doing so
- * results in reentrancy issues since cec_s_phys_addr() might call
- * .adap_enable, which leads to that funtion being called with our mutex
- * held.
- *
- * Concurrency isn't an issue at the moment since we don't share
- * any state with any of the other frameworks so we can ignore
- * the lock for now.
- */
-
- drm_edid = drm_edid_read_ddc(connector, vc4_hdmi->ddc);
- drm_edid_connector_update(connector, drm_edid);
- cec_s_phys_addr(vc4_hdmi->cec_adap,
- connector->display_info.source_physical_address, false);
- if (!drm_edid)
- return 0;
-
ret = drm_edid_connector_add_modes(connector);
- drm_edid_free(drm_edid);
if (!vc4->hvs->vc5_hdmi_enable_hdmi_20) {
struct drm_device *drm = connector->dev;
--
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