[Intel-gfx] [PATCH 5/5] drm/i915/debugfs: Print PSR selective update status register values

[Dhinakaran Pandiyan]

On Tue, 2018-12-04 at 15:00 -0800, José Roberto de Souza wrote:
> The value of this registers will be used to test if PSR2 is doing
> selective update and if the number of blocks match with the expected.
> 
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 42 ++++++++++++++++++++++++++-
> --
>  1 file changed, 38 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> b/drivers/gpu/drm/i915/i915_debugfs.c
> index 505d93b31eb6..754b33194e09 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -2760,10 +2760,44 @@ static int i915_edp_psr_status(struct
> seq_file *m, void *data)
>  		seq_printf(m, "Performance counter: %u\n", val);
>  	}
>  
> -	if ((psr->debug & I915_PSR_DEBUG_IRQ) && !psr->psr2_enabled) {
> -		seq_printf(m, "Last attempted entry at: %lld\n",
> -			   psr->last_entry_attempt);
> -		seq_printf(m, "Last exit at: %lld\n", psr->last_exit);
> +	if (!psr->psr2_enabled) {
> +		if (psr->debug & I915_PSR_DEBUG_IRQ) {
> +			seq_printf(m, "Last attempted entry at:
> %lld\n",
> +				   psr->last_entry_attempt);
> +			seq_printf(m, "Last exit at: %lld\n", psr-
> >last_exit);
> +		}
> +	} else {
> +		u8 i;
> +
> +		val = I915_READ(EDP_PSR2_SU_STATUS);
> +		seq_printf(m, "PSR2 SU status: 0x%08x\n", val);
> +		for (i = 0; val && i < 3; i++) {
> +			u32 num;
> +
> +			num = val &
> EDP_PSR2_SU_STATUS_NUM_SU_BLOCKS_IN_FRAME_MASK(i);
> +			num = num >>
> EDP_PSR2_SU_STATUS_NUM_SU_BLOCKS_IN_FRAME_SHIFT(i);
> +			seq_printf(m, "\tSU num blocks in frame N-%u:
> %u\n", i, num);
> +		}
> +
> +		val = I915_READ(EDP_PSR2_SU_STATUS2);
> +		seq_printf(m, "PSR2 SU status2: 0x%08x\n", val);
> +		for (i = 0; val && i < 3; i++) {
> +			u32 num;
> +
> +			num = val &
> EDP_PSR2_SU_STATUS_NUM_SU_BLOCKS_IN_FRAME_MASK(i);
> +			num = num >>
> EDP_PSR2_SU_STATUS_NUM_SU_BLOCKS_IN_FRAME_SHIFT(i);
> +			seq_printf(m, "\tSU num blocks in frame N-%u:
> %u\n", i + 3, num);
> +		}
> +
> +		val = I915_READ(EDP_PSR2_SU_STATUS3);
> +		seq_printf(m, "PSR2 SU status3: 0x%08x\n", val);
> +		for (i = 0; val && i < 2; i++) {
> +			u32 num;
> +
> +			num = val &
> EDP_PSR2_SU_STATUS_NUM_SU_BLOCKS_IN_FRAME_MASK(i);
> +			num = num >>
> EDP_PSR2_SU_STATUS_NUM_SU_BLOCKS_IN_FRAME_SHIFT(i);
> +			seq_printf(m, "\tSU num blocks in frame N-%u:
> %u\n", i + 6, num);
nitpick: Have you considered reducing the text that's getting printed
here? I guess we might not need to increase the read buffer size in IGT
if we do some thing like this. 

Frame	SU blocks
0	f
1	o
2	o
....

I'll leave it to you if you want to change, but I do prefer making this
less verbose.

> +		}
>  	}
>  
>  unlock: