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drm/i915: Disable live M/N updates when using bigjoiner 

commit 4a36e46df7 upstream.

All joined pipes share the same transcoder/timing generator.
Currently we just do the commits per-pipe, which doesn't really
work if we need to change the timings at the same time. For
now just disable live M/N updates when bigjoiner is needed.

Cc: stable@vger.kernel.org
Tested-by: Vidya Srinivas <vidya.srinivas@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240404213441.17637-5-ville.syrjala@linux.intel.com
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
(cherry picked from commit ef79820db7)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ville Syrjälä 2024-04-05 00:34:28 +03:00 committed by Greg Kroah-Hartman
parent fd2bfa93cd
commit 7da638ccb7
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/i915/display/intel_dp.c
View File

@ -2756,7 +2756,11 @@ intel_dp_drrs_compute_config(struct intel_connector *connector,
intel_panel_downclock_mode(connector, &pipe_config->hw.adjusted_mode);
int pixel_clock;
if (has_seamless_m_n(connector))
/*
* FIXME all joined pipes share the same transcoder.
* Need to account for that when updating M/N live.
*/
if (has_seamless_m_n(connector) && !pipe_config->bigjoiner_pipes)
pipe_config->update_m_n = true;
if (!can_enable_drrs(connector, pipe_config, downclock_mode)) {