[Intel-gfx] [PATCH] drm/i915: Allow panel drrs modes to have differing sync polarities

[Vidya Srinivas]

v2: Add Jani Nikula's change for quirk for sync polarity

CC: Jani Nikula <jani.nik...@intel.com>
Credits-to: Jani Nikula <jani.nik...@intel.com>
Signed-off-by: Vidya Srinivas <vidya.srini...@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c |  2 +-
 drivers/gpu/drm/i915/display/intel_panel.c   | 10 ++++++----
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c 
b/drivers/gpu/drm/i915/display/intel_display.c
index 43cba98f7753..088b45e032aa 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -5234,7 +5234,7 @@ intel_pipe_config_compare(const struct intel_crtc_state 
*current_config,
        PIPE_CONF_CHECK_FLAGS(hw.adjusted_mode.flags,
                              DRM_MODE_FLAG_INTERLACE);
 
-       if (!PIPE_CONF_QUIRK(PIPE_CONFIG_QUIRK_MODE_SYNC_FLAGS)) {
+       if (!PIPE_CONF_QUIRK(PIPE_CONFIG_QUIRK_MODE_SYNC_FLAGS) && !fastset) {
                PIPE_CONF_CHECK_FLAGS(hw.adjusted_mode.flags,
                                      DRM_MODE_FLAG_PHSYNC);
                PIPE_CONF_CHECK_FLAGS(hw.adjusted_mode.flags,
diff --git a/drivers/gpu/drm/i915/display/intel_panel.c 
b/drivers/gpu/drm/i915/display/intel_panel.c
index 9232a305b1e6..b9eeaedabd22 100644
--- a/drivers/gpu/drm/i915/display/intel_panel.c
+++ b/drivers/gpu/drm/i915/display/intel_panel.c
@@ -112,10 +112,12 @@ intel_panel_fixed_mode(struct intel_connector *connector,
 static bool is_alt_drrs_mode(const struct drm_display_mode *mode,
                             const struct drm_display_mode *preferred_mode)
 {
-       return drm_mode_match(mode, preferred_mode,
-                             DRM_MODE_MATCH_TIMINGS |
-                             DRM_MODE_MATCH_FLAGS |
-                             DRM_MODE_MATCH_3D_FLAGS) &&
+       u32 sync_flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NHSYNC |
+               DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_NVSYNC;
+
+       return (mode->flags & ~sync_flags) == (preferred_mode->flags & 
~sync_flags) &&
+               mode->hdisplay == preferred_mode->hdisplay &&
+               mode->vdisplay == preferred_mode->vdisplay &&
                mode->clock != preferred_mode->clock;
 }
 
-- 
2.33.0