[Intel-gfx] [PATCH] drm/i915: Show dmc debug registers on CFL and GLK

[Rodrigo Vivi]

On Thu, Mar 15, 2018 at 03:35:02PM +0200, David Weinehall wrote:
> Since Coffee Lake uses the Kaby Lake DMC it's a safe
> bet that the debug registers are the same. I haven't
> double-checked that the GLK DMC uses the same registers
> as BXT, but it seems as good of a guess as any.

It would be good to check. Last time that I checked we were getting
deep PC residencies but these registers were zeroed on CFL.

Also this bit confuses many people since it is not a
proper residency counter :/

> 
> Signed-off-by: David Weinehall <david.weinehall at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index c4cc8fef11a0..dad0776d58b4 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -2813,13 +2813,14 @@ static int i915_dmc_info(struct seq_file *m, void *unused)
>  	seq_printf(m, "version: %d.%d\n", CSR_VERSION_MAJOR(csr->version),
>  		   CSR_VERSION_MINOR(csr->version));
>  
> -	if (IS_KABYLAKE(dev_priv) ||
> +	if (IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv) ||
>  	    (IS_SKYLAKE(dev_priv) && csr->version >= CSR_VERSION(1, 6))) {
>  		seq_printf(m, "DC3 -> DC5 count: %d\n",
>  			   I915_READ(SKL_CSR_DC3_DC5_COUNT));
>  		seq_printf(m, "DC5 -> DC6 count: %d\n",
>  			   I915_READ(SKL_CSR_DC5_DC6_COUNT));
> -	} else if (IS_BROXTON(dev_priv) && csr->version >= CSR_VERSION(1, 4)) {
> +	} else if (IS_GEMINILAKE(dev_priv) ||
> +	           IS_BROXTON(dev_priv) && csr->version >= CSR_VERSION(1, 4)) {
>  		seq_printf(m, "DC3 -> DC5 count: %d\n",
>  			   I915_READ(BXT_CSR_DC3_DC5_COUNT));
>  	}
> -- 
> 2.16.2
> 
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