[PATCH] [i-g-t] lib/kms_psr: Honour PSR OS capability alongside Sink capability

[Sharma, Swati2]

Hi Soumya,

On 17-Jan-24 3:19 PM, soumya prabhu nidoni wrote:
> Currently IGT code is checking only the Sink Support it's not verifying
> OS capability.So this patch is verifying OS PSR capability.
> 
> Signed-off-by: soumya prabhu nidoni <soumya.prabhu.nidoni at intel.com>
> ---
>   lib/igt_psr.c | 19 ++++++++++++++-----
>   1 file changed, 14 insertions(+), 5 deletions(-)
> 
> diff --git a/lib/igt_psr.c b/lib/igt_psr.c
> index 663bac163..f43d46dfb 100644
> --- a/lib/igt_psr.c
> +++ b/lib/igt_psr.c
> @@ -208,7 +208,8 @@ bool psr_sink_support(int device, int debugfs_fd, enum psr_mode mode, igt_output
>   {
>   	char *line;
>   	char debugfs_file[128] = {0};
> -	char buf[PSR_STATUS_MAX_LEN];
> +	char debugfs_file1[128] = {0};
> +	char buf[PSR_STATUS_MAX_LEN], buf1[5000];
>   	int ret;
>   
>   	if (output)
> @@ -216,10 +217,16 @@ bool psr_sink_support(int device, int debugfs_fd, enum psr_mode mode, igt_output
>   	else
>   		sprintf(debugfs_file, "%s", "i915_edp_psr_status");
>   
> +	sprintf(debugfs_file1, "%s", "i915_capabilities");

i915_capabilities is specific to i915 driver. However for xe and i915 we 
have i915_display_capabilities where you can parse has_psr: yes to know 
h/w capability.

So, this change of yours won't work with xe driver and we need to make 
generic change supporting both drivers.

> +
>   	ret = igt_debugfs_simple_read(debugfs_fd, debugfs_file, buf,
>   				      sizeof(buf));
>   	if (ret < 1)
>   		return false;
> +	ret = igt_debugfs_simple_read(debugfs_fd, debugfs_file1, buf1,
> +				      sizeof(buf1));
> +	if (ret < 1)
> +		return false;
>   
>   	line = strstr(buf, "Sink support: ");
>   	if (!line)
> @@ -227,9 +234,10 @@ bool psr_sink_support(int device, int debugfs_fd, enum psr_mode mode, igt_output
>   
>   	switch (mode) {
>   	case PSR_MODE_1:
> -		return strstr(line, "PSR = yes") ||
> +		return ((strstr(line, "PSR = yes") ||
>   		       strstr(buf, "Sink_Support: yes\n") ||
> -		       strstr(buf, "Sink support: yes");
> +		       strstr(buf, "Sink support: yes")) &&
> +		       strstr(buf1, "i915.enable_psr=1"));
>   	case PSR_MODE_2:
>   	case PSR_MODE_2_SEL_FETCH:
>   		/*
> @@ -240,10 +248,11 @@ bool psr_sink_support(int device, int debugfs_fd, enum psr_mode mode, igt_output
>   		 * PSR version 0x4 that is PSR2 + SU w/ Y-coordinate and SU
>   		 * Region Early Transport to support PSR2 (eDP 1.5)
>   		 */
> -		return strstr(buf, "Sink support: yes [0x03]") ||
> +		return ((strstr(buf, "Sink support: yes [0x03]") ||
>   		       strstr(buf, "Sink support: yes [0x04]") ||
>   		       (strstr(line, "PSR = yes") &&
> -		       (strstr(line, "[0x03]") || strstr(line, "[0x04]")));
> +		       (strstr(line, "[0x03]") || strstr(line, "[0x04]")))) &&
> +			strstr(buf1, "i915.enable_psr=2"));
>   	case PR_MODE:
>   		return strstr(line, "Panel Replay = yes");
>   	default: