From: Ville Syrjala <ville.syrjala@linux.intel.com>
To: intel-gfx@lists.freedesktop.org
Subject: [Intel-gfx] [PATCH v2 5/6] drm/i915: Reject user modes that don't match fixed mode's refresh rate
Date: Mon, 27 Sep 2021 21:52:42 +0300 [thread overview]
Message-ID: <20210927185242.13754-1-ville.syrjala@linux.intel.com> (raw)
In-Reply-To: <20210923200109.4459-6-ville.syrjala@linux.intel.com>
From: Ville Syrjälä <ville.syrjala@linux.intel.com>
When using a panel with a fixed mode we don't change the refresh
rate of the display. Reject any user requested mode which doesn't
match that fixed refresh rate.
Unfortunately when Xorg sees the scaling_mode property on the
connecor it likes to automagically cook up modes whose refresh
rate is a fair bit off from the fixed refresh rate we use. So
we have to give it some extra latitude so that we don't start to
reject all of it.
v2: sDVO now uses intel_panel_compute_config() too
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
drivers/gpu/drm/i915/display/intel_panel.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_panel.c b/drivers/gpu/drm/i915/display/intel_panel.c
index 77c1ca387de0..8c1ea322502c 100644
--- a/drivers/gpu/drm/i915/display/intel_panel.c
+++ b/drivers/gpu/drm/i915/display/intel_panel.c
@@ -53,6 +53,15 @@ int intel_panel_compute_config(struct intel_connector *connector,
if (!fixed_mode)
return 0;
+ /*
+ * We don't want to lie too much to the user about the refresh
+ * rate they're going to get. But we have to allow a bit of latitude
+ * for Xorg since it likes to automagically cook up modes with slightly
+ * off refresh rates.
+ */
+ if (abs(drm_mode_vrefresh(adjusted_mode) - drm_mode_vrefresh(fixed_mode)) > 1)
+ return -EINVAL;
+
drm_mode_copy(adjusted_mode, fixed_mode);
drm_mode_set_crtcinfo(adjusted_mode, 0);
--
2.32.0
next prev parent reply other threads:[~2021-09-27 18:52 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-23 20:01 [Intel-gfx] [PATCH 0/6] drm/i915: Reject bogus modes with fixed mode panels Ville Syrjala
2021-09-23 20:01 ` [Intel-gfx] [PATCH 1/6] drm/i915: Extract intel_panel_mode_valid() Ville Syrjala
2021-09-23 20:01 ` [Intel-gfx] [PATCH 2/6] drm/i915: Use intel_panel_mode_valid() for DSI/LVDS/DVO Ville Syrjala
2021-09-23 20:01 ` [Intel-gfx] [PATCH 3/6] drm/i915: Reject modes that don't match fixed_mode vrefresh Ville Syrjala
2021-09-23 20:01 ` [Intel-gfx] [PATCH 4/6] drm/i915: Introduce intel_panel_compute_config() Ville Syrjala
2021-09-24 12:41 ` Ville Syrjälä
2021-09-27 18:52 ` [Intel-gfx] [PATCH v2 " Ville Syrjala
2021-09-23 20:01 ` [Intel-gfx] [PATCH 5/6] drm/i915: Reject user modes that don't match fixed mode's refresh rate Ville Syrjala
2021-09-27 18:52 ` Ville Syrjala [this message]
2021-09-29 18:45 ` [Intel-gfx] [PATCH v3 " Ville Syrjala
2021-09-23 20:01 ` [Intel-gfx] [PATCH 6/6] drm/i915: Drop pointless fixed_mode checks from dsi code Ville Syrjala
2021-09-23 22:18 ` [Intel-gfx] ✓ Fi.CI.BAT: success for drm/i915: Reject bogus modes with fixed mode panels Patchwork
2021-09-24 3:26 ` [Intel-gfx] ✓ Fi.CI.IGT: " Patchwork
2021-09-24 10:48 ` [Intel-gfx] [PATCH 0/6] " Jani Nikula
2021-09-24 11:24 ` Ville Syrjälä
2021-09-27 21:21 ` [Intel-gfx] ✓ Fi.CI.BAT: success for drm/i915: Reject bogus modes with fixed mode panels (rev3) Patchwork
2021-09-28 2:11 ` [Intel-gfx] ✗ Fi.CI.IGT: failure " Patchwork
2021-09-29 5:47 ` [Intel-gfx] [PATCH 0/6] drm/i915: Reject bogus modes with fixed mode panels Jani Nikula
2021-09-29 19:48 ` [Intel-gfx] ✓ Fi.CI.BAT: success for drm/i915: Reject bogus modes with fixed mode panels (rev4) Patchwork
2021-09-29 22:45 ` [Intel-gfx] ✗ Fi.CI.IGT: failure " Patchwork
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