linux-kernel - Re: [PATCH v2 08/14] drm/msm/hdmi: add runtime PM calls to DDC transfer function

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Date: Tue, 18 Jun 2024 17:05:30 -0700
From: Jessica Zhang <quic_jesszhan@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        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>, Daniel Vetter <daniel@...ll.ch>
CC: <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 08/14] drm/msm/hdmi: add runtime PM calls to DDC
 transfer function



On 5/22/2024 3:51 AM, Dmitry Baryshkov wrote:
> 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().
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

Reviewed-by: Jessica Zhang <quic_jesszhan@...cinc.com>

> ---
>   drivers/gpu/drm/msm/hdmi/hdmi_i2c.c | 14 ++++++++++++--
>   1 file changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_i2c.c b/drivers/gpu/drm/msm/hdmi/hdmi_i2c.c
> index 7aa500d24240..ebefea4fb408 100644
> --- 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)
> 
> -- 
> 2.39.2
>