linux-kernel - [PATCH v4 08/16] drm/msm/hdmi: switch to pm_runtime_resume_and

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Message-Id: <20250209-fd-hdmi-hpd-v4-8-6224568ed87f@linaro.org>
Date: Sun, 09 Feb 2025 07:04:52 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Rob Clark <robdclark@...il.com>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Simona Vetter <simona.vetter@...ll.ch>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, Jessica Zhang <quic_jesszhan@...cinc.com>
Subject: [PATCH v4 08/16] drm/msm/hdmi: switch to
 pm_runtime_resume_and_get()

The pm_runtime_get_sync() function is a bad choise for runtime power
management. Switch HDMI driver to pm_runtime_resume_and_get() and add
proper error handling, while we are at it.

Reviewed-by: Jessica Zhang <quic_jesszhan@...cinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/gpu/drm/msm/hdmi/hdmi_bridge.c |  2 +-
 drivers/gpu/drm/msm/hdmi/hdmi_hpd.c    | 12 ++++++++++--
 drivers/gpu/drm/msm/hdmi/hdmi_phy.c    |  6 +++++-
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
index 6c5bbd772700b0362f884a737598d7bf419adf9b..d7d5d3755fb853377aa999e2a830debf54afe984 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
@@ -21,7 +21,7 @@ static void msm_hdmi_power_on(struct drm_bridge *bridge)
 	const struct hdmi_platform_config *config = hdmi->config;
 	int ret;
 
-	pm_runtime_get_sync(&hdmi->pdev->dev);
+	pm_runtime_resume_and_get(&hdmi->pdev->dev);
 
 	ret = regulator_bulk_enable(config->pwr_reg_cnt, hdmi->pwr_regs);
 	if (ret)
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_hpd.c b/drivers/gpu/drm/msm/hdmi/hdmi_hpd.c
index e253c1408dd1c6dcd7e94506f0b8edcfd4a9a159..d77c68914c5f525cf12971c1058b1abc33792b24 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi_hpd.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_hpd.c
@@ -85,7 +85,12 @@ int msm_hdmi_hpd_enable(struct drm_bridge *bridge)
 	if (hdmi->hpd_gpiod)
 		gpiod_set_value_cansleep(hdmi->hpd_gpiod, 1);
 
-	pm_runtime_get_sync(dev);
+	ret = pm_runtime_resume_and_get(dev);
+	if (ret) {
+		DRM_DEV_ERROR(dev, "runtime resume failed: %d\n", ret);
+		goto fail;
+	}
+
 	ret = clk_bulk_prepare_enable(config->hpd_clk_cnt, hdmi->hpd_clks);
 	if (ret)
 		goto fail;
@@ -178,7 +183,10 @@ static enum drm_connector_status detect_reg(struct hdmi *hdmi)
 	u32 hpd_int_status = 0;
 	int ret;
 
-	pm_runtime_get_sync(&hdmi->pdev->dev);
+	ret = pm_runtime_resume_and_get(&hdmi->pdev->dev);
+	if (ret)
+		goto out;
+
 	ret = clk_bulk_prepare_enable(config->hpd_clk_cnt, hdmi->hpd_clks);
 	if (ret)
 		goto out;
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_phy.c b/drivers/gpu/drm/msm/hdmi/hdmi_phy.c
index 03120c54ced686dcd2ddfe809dd9c9011f608235..667573f1db7c6bfef6c75828b5c581c147a86d0d 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi_phy.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_phy.c
@@ -58,7 +58,11 @@ int msm_hdmi_phy_resource_enable(struct hdmi_phy *phy)
 	struct device *dev = &phy->pdev->dev;
 	int i, ret = 0;
 
-	pm_runtime_get_sync(dev);
+	ret = pm_runtime_resume_and_get(dev);
+	if (ret) {
+		DRM_DEV_ERROR(dev, "runtime resume failed: %d\n", ret);
+		return ret;
+	}
 
 	ret = regulator_bulk_enable(cfg->num_regs, phy->regs);
 	if (ret) {

-- 
2.39.5