Re: [PATCH v2] drm/i915/display/tgl: Bump up the mode vertical limits to support 8K

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, Jul 09, 2019 at 05:06:13PM -0700, Manasi Navare wrote:
> On TGL+ we support 8K display resolution, hence bump up the vertical
> active limits to 4320 in intel_mode_valid()
> 
> v2:
> * Checkpatch warning (Manasi)
> 
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_display.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index f07081815b80..cfceb27e4b9e 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -15764,8 +15764,13 @@ intel_mode_valid(struct drm_device *dev,
>  			   DRM_MODE_FLAG_CLKDIV2))
>  		return MODE_BAD;
>  
> -	if (INTEL_GEN(dev_priv) >= 9 ||
> -	    IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv)) {
> +	if (INTEL_GEN(dev_priv) >= 12) {
> +		hdisplay_max = 8192;
> +		vdisplay_max = 4320;
> +		htotal_max = 8192;
> +		vtotal_max = 8192;

I wonder if we can safely bump these before we get the joiner stuff sorted.
Hmm. I guess it should be fine as the limit that is supposed to overcome
is caused by the cdclk max frequency being too low to allow a single
pipe to push enough pixels. And since we check that in .mode_valid() we
shouldn't accidentally start to advertize support for modes we can't do.

Which means these limits should actually be higher than this. 16k for
htotal+hdisplay and 8k for vtotal+vdisplay already on icl I believe.

> +	} else if (INTEL_GEN(dev_priv) >= 9 ||
> +		   IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv)) {
>  		hdisplay_max = 8192; /* FDI max 4096 handled elsewhere */
>  		vdisplay_max = 4096;
>  		htotal_max = 8192;
> -- 
> 2.19.1

-- 
Ville Syrjälä
Intel
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