[PATCH 5.15.y 2/2] drm/msm/hdmi_phy: Cleanup after msm_hdmi_phy_resource_enable() failure

[Sasha Levin <sashal@kernel.org>]

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

[ Upstream commit d27f831aaf20aaf06e41ceb1b260e10672269155 ]

If msm_hdmi_phy_resource_enable() fails, e.g. when enabling regulators,
it should reverse the state of things already changed.
msm_hdmi_phy_resource_enable() is used also in probe path, thus such
failure, which could be simple deferred probe, would leave these
resources permanently enabled for the rest of the runtime.

Cc: <stable@vger.kernel.org>
Fixes: 15b4a4523859 ("drm/msm/hdmi: Create a separate HDMI PHY driver")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/752654/
Link: https://lore.kernel.org/r/20260911-drm-msm-hdmi-fixes-before-eliza-v4-1-87bdb9f1987f@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/msm/hdmi/hdmi_phy.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_phy.c b/drivers/gpu/drm/msm/hdmi/hdmi_phy.c
index 326b43c803f09..1bdaa1f94c29b 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi_phy.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_phy.c
@@ -62,16 +62,28 @@ int msm_hdmi_phy_resource_enable(struct hdmi_phy *phy)
 	ret = regulator_bulk_enable(cfg->num_regs, phy->regs);
 	if (ret) {
 		DRM_DEV_ERROR(dev, "failed to enable regulators: (%d)\n", ret);
-		return ret;
+		goto err_pm_put;
 	}
 
 	for (i = 0; i < cfg->num_clks; i++) {
 		ret = clk_prepare_enable(phy->clks[i]);
-		if (ret)
+		if (ret) {
 			DRM_DEV_ERROR(dev, "failed to enable clock: %s (%d)\n",
 				cfg->clk_names[i], ret);
+			goto err_clk_unprepare;
+		}
 	}
 
+	return 0;
+
+err_clk_unprepare:
+	for (; i > 0; i--)
+		clk_disable_unprepare(phy->clks[i - 1]);
+	regulator_bulk_disable(cfg->num_regs, phy->regs);
+
+err_pm_put:
+	pm_runtime_put_sync(dev);
+
 	return ret;
 }
 
-- 
2.53.0