drm/msm/hdmi: add runtime PM calls to DDC transfer function

We must be sure that the HDMI controller is powered on, while performing
the DDC transfer. Add corresponding runtime PM calls to
msm_hdmi_i2c_xfer().

Reviewed-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/651727/
Link: https://lore.kernel.org/r/20250505-fd-hdmi-hpd-v5-8-48541f76318c@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_i2c.c b/drivers/gpu/drm/msm/hdmi/hdmi_i2c.c
index 7aa500d24240ff3ed6694c469eafc4388c982346..ebefea4fb40855745001ed97367d571bde28f413 100644 (file)
--- a/drivers/gpu/drm/msm/hdmi/hdmi_i2c.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_i2c.c
@@ -107,11 +107,15 @@ static int msm_hdmi_i2c_xfer(struct i2c_adapter *i2c,
        if (num == 0)
                return num;
 
+       ret = pm_runtime_resume_and_get(&hdmi->pdev->dev);
+       if (ret)
+               return ret;
+
        init_ddc(hdmi_i2c);
 
        ret = ddc_clear_irq(hdmi_i2c);
        if (ret)
-               return ret;
+               goto fail;
 
        for (i = 0; i < num; i++) {
                struct i2c_msg *p = &msgs[i];
@@ -169,7 +173,7 @@ static int msm_hdmi_i2c_xfer(struct i2c_adapter *i2c,
                                hdmi_read(hdmi, REG_HDMI_DDC_SW_STATUS),
                                hdmi_read(hdmi, REG_HDMI_DDC_HW_STATUS),
                                hdmi_read(hdmi, REG_HDMI_DDC_INT_CTRL));
-               return ret;
+               goto fail;
        }
 
        ddc_status = hdmi_read(hdmi, REG_HDMI_DDC_SW_STATUS);
@@ -202,7 +206,13 @@ static int msm_hdmi_i2c_xfer(struct i2c_adapter *i2c,
                }
        }
 
+       pm_runtime_put(&hdmi->pdev->dev);
+
        return i;
+
+fail:
+       pm_runtime_put(&hdmi->pdev->dev);
+       return ret;
 }
 
 static u32 msm_hdmi_i2c_func(struct i2c_adapter *adapter)