[PATCH 6/6] drm/i915: Filter out modes that don't match the fixed mode vrefresh

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

We only ever drive the panel with the fixed mode, hence we don't
want to advertize any modes that have a different vertical refresh rate.

We tried to allow a second lower clocked mode to used for eDP but
that was reverted in commit d93fa1b47b8f ("Revert "drm/i915/edp:
Allow alternate fixed mode for eDP if available.""). To do that properly
I think we should probably just keep all (or just some?) of the probed
modes around (presumably all of them actually work if the panel
advertizes them), and we'd just pick the closest match based on the
user mode.

For now we don't have any of that so we shouldn't lie to the user
that they can drive the panel at different refresh rate. Note that
we still don't reject any user mode with bad refresh rate. That's
going to be step two.

TODO: Should we allow for a larger error margin?

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c   | 3 +++
 drivers/gpu/drm/i915/intel_dsi.c  | 2 ++
 drivers/gpu/drm/i915/intel_dvo.c  | 2 ++
 drivers/gpu/drm/i915/intel_lvds.c | 2 ++
 drivers/gpu/drm/i915/intel_sdvo.c | 2 ++
 5 files changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 5be07e1d816d..22feb0b144f6 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -446,6 +446,9 @@ intel_dp_mode_valid(struct drm_connector *connector,
 		if (mode->vdisplay > fixed_mode->vdisplay)
 			return MODE_PANEL;
 
+		if (mode->vrefresh != fixed_mode->vrefresh)
+			return MODE_PANEL;
+
 		target_clock = fixed_mode->clock;
 	}
 
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 3b7acb5a70b3..3d0758cec85a 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -1277,6 +1277,8 @@ intel_dsi_mode_valid(struct drm_connector *connector,
 			return MODE_PANEL;
 		if (mode->vdisplay > fixed_mode->vdisplay)
 			return MODE_PANEL;
+		if (mode->vrefresh != fixed_mode->vrefresh)
+			return MODE_PANEL;
 		if (fixed_mode->clock > max_dotclk)
 			return MODE_CLOCK_HIGH;
 	}
diff --git a/drivers/gpu/drm/i915/intel_dvo.c b/drivers/gpu/drm/i915/intel_dvo.c
index 4e142ff49708..078bb848a49a 100644
--- a/drivers/gpu/drm/i915/intel_dvo.c
+++ b/drivers/gpu/drm/i915/intel_dvo.c
@@ -225,6 +225,8 @@ intel_dvo_mode_valid(struct drm_connector *connector,
 			return MODE_PANEL;
 		if (mode->vdisplay > fixed_mode->vdisplay)
 			return MODE_PANEL;
+		if (mode->vrefresh != fixed_mode->vrefresh)
+			return MODE_PANEL;
 
 		target_clock = fixed_mode->clock;
 	}
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index bb06744d28a4..d312a8911b89 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -384,6 +384,8 @@ intel_lvds_mode_valid(struct drm_connector *connector,
 		return MODE_PANEL;
 	if (mode->vdisplay > fixed_mode->vdisplay)
 		return MODE_PANEL;
+	if (mode->vrefresh != fixed_mode->vrefresh)
+		return MODE_PANEL;
 	if (fixed_mode->clock > max_pixclk)
 		return MODE_CLOCK_HIGH;
 
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index cd5d5e800486..4be4bae51652 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -1650,6 +1650,8 @@ intel_sdvo_mode_valid(struct drm_connector *connector,
 			return MODE_PANEL;
 
 		if (mode->vdisplay > fixed_mode->vdisplay)
+
+		if (mode->vrefresh != fixed_mode->vrefresh)
 			return MODE_PANEL;
 	}
 
-- 
2.16.4