[PATCH 1/5] drm/i915/display: Fix the plane max height and width limits

[Ville Syrjälä]

On Fri, Oct 25, 2024 at 06:26:10AM +0000, Kandpal, Suraj wrote:
> 
> 
> > -----Original Message-----
> > From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > Sent: Friday, October 25, 2024 11:51 AM
> > To: Kandpal, Suraj <suraj.kandpal at intel.com>
> > Cc: intel-xe at lists.freedesktop.org; intel-gfx at lists.freedesktop.org; Nautiyal,
> > Ankit K <ankit.k.nautiyal at intel.com>; Roper, Matthew D
> > <matthew.d.roper at intel.com>
> > Subject: Re: [PATCH 1/5] drm/i915/display: Fix the plane max height and width
> > limits
> > 
> > On Fri, Oct 25, 2024 at 11:31:32AM +0530, Suraj Kandpal wrote:
> > > Fix the plane max height and width limits taking into account the
> > > joined pipe limits too.
> > >
> > > Bspec: 28692, 49199, 68858
> > > Fixes: 63dc014e37b9 ("drm/i915/dp: Allow big joiner modes in
> > > intel_dp_mode_valid(), v3.")
> > > Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
> > > ---
> > >  drivers/gpu/drm/i915/display/intel_display.c | 19 ++++++++++++++++---
> > >  1 file changed, 16 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> > > b/drivers/gpu/drm/i915/display/intel_display.c
> > > index ef1436146325..fc578af4f394 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_display.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_display.c
> > > @@ -8450,9 +8450,22 @@ intel_mode_valid_max_plane_size(struct
> > drm_i915_private *dev_priv,
> > >  	 * plane so let's not advertize modes that are
> > >  	 * too big for that.
> > >  	 */
> > > -	if (DISPLAY_VER(dev_priv) >= 11) {
> > > -		plane_width_max = 5120 * num_joined_pipes;
> > > -		plane_height_max = 4320;
> > > +	if (DISPLAY_VER(dev_priv) >= 20) {
> > > +		if (num_joined_pipes > 1) {
> > > +			plane_width_max = 8192;
> > > +			plane_height_max = 4800;
> > > +		} else {
> > > +			plane_width_max = 5120;
> > > +			plane_height_max = 4096;
> > 
> > The joiner operates on horizontal lines. Why would the vertical resolution
> > change here?
> > 
> 
> This is what I got from the bspec when pipe are joined the vertical resolution ends up
> Changing 

Those bspec pages look very confused.

-- 
Ville Syrjälä
Intel
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