Re: [DPU PATCH v3 1/2] drm/msm/dsi: check video mode engine status before waiting

[abhinavk@codeaurora.org]

On 2018-04-17 13:25, Sean Paul wrote:
> On Mon, Apr 16, 2018 at 06:56:45PM -0700, Abhinav Kumar wrote:
>> Make sure the video mode engine is on before waiting
>> for the video done interrupt.
>> 
>> Changes in v2:
>> - Replace pr_err with dev_err
>> - Changed error message
>> 
>> Changes in v3:
>> - Move the return value check to another
>>   patch
>> 
>> Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
>> ---
>>  drivers/gpu/drm/msm/dsi/dsi_host.c | 7 ++++---
>>  1 file changed, 4 insertions(+), 3 deletions(-)
>> 
>> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c 
>> b/drivers/gpu/drm/msm/dsi/dsi_host.c
>> index 7a03a94..8df0d44 100644
>> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
>> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
>> @@ -173,6 +173,7 @@ struct msm_dsi_host {
>> 
>>  	bool registered;
>>  	bool power_on;
>> +	bool enabled;
>>  	int irq;
>>  };
>> 
>> @@ -1001,7 +1002,7 @@ static void dsi_wait4video_eng_busy(struct 
>> msm_dsi_host *msm_host)
>>  	if (!(msm_host->mode_flags & MIPI_DSI_MODE_VIDEO))
>>  		return;
>> 
>> -	if (msm_host->power_on) {
>> +	if (msm_host->power_on && msm_host->enabled) {
>>  		dsi_wait4video_done(msm_host);
>>  		/* delay 4 ms to skip BLLP */
>>  		usleep_range(2000, 4000);
>> @@ -2203,7 +2204,7 @@ int msm_dsi_host_enable(struct mipi_dsi_host 
>> *host)
>>  	 *	pm_runtime_put_autosuspend(&msm_host->pdev->dev);
>>  	 * }
>>  	 */
>> -
>> +	msm_host->enabled = true;
>>  	return 0;
>>  }
>> 
>> @@ -2219,7 +2220,7 @@ int msm_dsi_host_disable(struct mipi_dsi_host 
>> *host)
>>  	 * Reset to disable video engine so that we can send off cmd.
>>  	 */
>>  	dsi_sw_reset(msm_host);
>> -
>> +	msm_host->enabled = false;
> 
> I thought this was moving to the start of the function?
> 
[Abhinav] Yes, my bad. While rebasing that review comment was left out.
Uploading v4 right now
>>  	return 0;
>>  }
>> 
>> --
>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora 
>> Forum,
>> a Linux Foundation Collaborative Project
>> 
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