FAILED: patch "[PATCH] drm/msm/hdmi: Handle msm_hdmi_power_on() errors during .atomic_pre_enable()" failed to apply to 6.12-stable tree

FAILED: patch "[PATCH] drm/msm/hdmi: Handle msm_hdmi_power_on() errors during .atomic_pre_enable()" failed to apply to 6.12-stable tree

[Sasha Levin]

The patch below does not apply to the 6.12-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y
git checkout FETCH_HEAD
git cherry-pick -x dd6ecace57851878e62367a6f1a26dd5b9aa217f
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '20261107051826-failed-6.12-dd6ecace5785@kernel.org' --subject-prefix 'PATCH 6.12.y' 'HEAD^..'

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From dd6ecace57851878e62367a6f1a26dd5b9aa217f Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Date: Fri, 11 Sep 2026 12:29:35 +0200
Subject: [PATCH] drm/msm/hdmi: Handle msm_hdmi_power_on() errors during
 .atomic_pre_enable()

Properly handle power up failures during .atomic_pre_enable() by
aborting the .atomic_pre_enable() to avoid accessing registers why
blocks did not bring up.  Otherwise this could lead to imprecise aborts
when accessing MMIO while entire power domain is off.

Cc: <stable@vger.kernel.org>
Fixes: ba3d7bf3a7ab ("drm/msm/hdmi: Convert PHY files according to new design")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/752652/
Link: https://lore.kernel.org/r/20260911-drm-msm-hdmi-fixes-before-eliza-v4-2-87bdb9f1987f@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/msm/hdmi/hdmi_bridge.c | 30 ++++++++++++++++++--------
 1 file changed, 21 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
index 157f19bd90b4e..db85400e574e4 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
@@ -13,14 +13,16 @@
 #include "msm_kms.h"
 #include "hdmi.h"
 
-static void msm_hdmi_power_on(struct drm_bridge *bridge)
+static int msm_hdmi_power_on(struct drm_bridge *bridge)
 {
 	struct drm_device *dev = bridge->dev;
 	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
 	struct hdmi *hdmi = hdmi_bridge->hdmi;
 	int ret;
 
-	pm_runtime_resume_and_get(&hdmi->pdev->dev);
+	ret = pm_runtime_resume_and_get(&hdmi->pdev->dev);
+	if (ret)
+		return ret;
 
 	if (hdmi->extp_clk) {
 		DBG("pixclock: %lu", hdmi->pixclock);
@@ -29,9 +31,14 @@ static void msm_hdmi_power_on(struct drm_bridge *bridge)
 			DRM_DEV_ERROR(dev->dev, "failed to set extp clk rate: %d\n", ret);
 
 		ret = clk_prepare_enable(hdmi->extp_clk);
-		if (ret)
+		if (ret) {
 			DRM_DEV_ERROR(dev->dev, "failed to enable extp clk: %d\n", ret);
+			pm_runtime_put(&hdmi->pdev->dev);
+			return ret;
+		}
 	}
+
+	return 0;
 }
 
 static void power_off(struct drm_bridge *bridge)
@@ -287,13 +294,18 @@ static void msm_hdmi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
 
 	msm_hdmi_set_timings(hdmi, &crtc_state->adjusted_mode);
 
-	mutex_lock(&hdmi->state_mutex);
-	if (!hdmi->power_on) {
-		msm_hdmi_phy_resource_enable(phy);
-		msm_hdmi_power_on(bridge);
-		hdmi->power_on = true;
+	scoped_guard(mutex, &hdmi->state_mutex) {
+		if (!hdmi->power_on) {
+			if (msm_hdmi_phy_resource_enable(phy))
+				return;
+
+			if (msm_hdmi_power_on(bridge)) {
+				msm_hdmi_phy_resource_disable(phy);
+				return;
+			}
+			hdmi->power_on = true;
+		}
 	}
-	mutex_unlock(&hdmi->state_mutex);
 
 	if (connector->display_info.is_hdmi)
 		msm_hdmi_audio_update(hdmi);
-- 
2.53.0

[PATCH 6.12.y] drm/msm/hdmi: Handle msm_hdmi_power_on() errors during .atomic_pre_enable()

[Sasha Levin]

From: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>

[ Upstream commit dd6ecace57851878e62367a6f1a26dd5b9aa217f ]

Properly handle power up failures during .atomic_pre_enable() by
aborting the .atomic_pre_enable() to avoid accessing registers why
blocks did not bring up.  Otherwise this could lead to imprecise aborts
when accessing MMIO while entire power domain is off.

Cc: <stable@vger.kernel.org>
Fixes: ba3d7bf3a7ab ("drm/msm/hdmi: Convert PHY files according to new design")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/752652/
Link: https://lore.kernel.org/r/20260911-drm-msm-hdmi-fixes-before-eliza-v4-2-87bdb9f1987f@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
[ sashal: adapted atomic_pre_enable() error handling to pre_enable() with explicit regulator and multiple-clock cleanup ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/msm/hdmi/hdmi_bridge.c | 30 +++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
index b4abac49f5d96..4b874b1c846ad 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
@@ -11,7 +11,7 @@
 #include "msm_kms.h"
 #include "hdmi.h"
 
-static void msm_hdmi_power_on(struct drm_bridge *bridge)
+static int msm_hdmi_power_on(struct drm_bridge *bridge)
 {
 	struct drm_device *dev = bridge->dev;
 	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
@@ -19,11 +19,15 @@ static void msm_hdmi_power_on(struct drm_bridge *bridge)
 	const struct hdmi_platform_config *config = hdmi->config;
 	int i, ret;
 
-	pm_runtime_get_sync(&hdmi->pdev->dev);
+	ret = pm_runtime_resume_and_get(&hdmi->pdev->dev);
+	if (ret)
+		return ret;
 
 	ret = regulator_bulk_enable(config->pwr_reg_cnt, hdmi->pwr_regs);
-	if (ret)
+	if (ret) {
 		DRM_DEV_ERROR(dev->dev, "failed to enable pwr regulator: %d\n", ret);
+		goto err_pm_put;
+	}
 
 	if (config->pwr_clk_cnt > 0) {
 		DBG("pixclock: %lu", hdmi->pixclock);
@@ -39,8 +43,19 @@ static void msm_hdmi_power_on(struct drm_bridge *bridge)
 		if (ret) {
 			DRM_DEV_ERROR(dev->dev, "failed to enable pwr clk: %s (%d)\n",
 					config->pwr_clk_names[i], ret);
+			goto err_clk_unprepare;
 		}
 	}
+
+	return 0;
+
+err_clk_unprepare:
+	for (; i > 0; i--)
+		clk_disable_unprepare(hdmi->pwr_clks[i - 1]);
+	regulator_bulk_disable(config->pwr_reg_cnt, hdmi->pwr_regs);
+err_pm_put:
+	pm_runtime_put(&hdmi->pdev->dev);
+	return ret;
 }
 
 static void power_off(struct drm_bridge *bridge)
@@ -135,8 +150,13 @@ static void msm_hdmi_bridge_pre_enable(struct drm_bridge *bridge)
 	DBG("power up");
 
 	if (!hdmi->power_on) {
-		msm_hdmi_phy_resource_enable(phy);
-		msm_hdmi_power_on(bridge);
+		if (msm_hdmi_phy_resource_enable(phy))
+			return;
+
+		if (msm_hdmi_power_on(bridge)) {
+			msm_hdmi_phy_resource_disable(phy);
+			return;
+		}
 		hdmi->power_on = true;
 		if (hdmi->hdmi_mode) {
 			msm_hdmi_config_avi_infoframe(hdmi);
-- 
2.53.0