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From cf16c0d16b42215f35dcede6163235ad5ec1734b Mon Sep 17 00:00:00 2001
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From: Mario Limonciello <mario.limonciello@amd.com>
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Date: Thu, 18 Aug 2022 13:36:20 -0500
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Subject: [PATCH] output/kms: Add more heuristics to decide when to offer
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fallback modes
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If the panel is connected via eDP and supports more than one mode
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at different resolutions don't try to add more.
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Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2586>
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(cherry picked from commit 96aa0fb8536eca579ceb1b17d83e19cf9e3e9e81)
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---
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src/backends/native/meta-output-kms.c | 45 ++++++++++++++++++++++-----
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1 file changed, 38 insertions(+), 7 deletions(-)
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diff --git a/src/backends/native/meta-output-kms.c b/src/backends/native/meta-output-kms.c
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index f3cc543c4d..44c25c5648 100644
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--- a/src/backends/native/meta-output-kms.c
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+++ b/src/backends/native/meta-output-kms.c
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@@ -505,6 +505,43 @@ compare_modes (const void *one,
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return g_strcmp0 (b->name, a->name);
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}
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+static gboolean
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+are_all_modes_equally_sized (MetaOutput *output)
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+{
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+ MetaCrtcMode *base = output->modes[0];
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+ int i;
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+
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+ for (i = 1; i < output->n_modes; i++)
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+ {
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+ MetaCrtcMode *crtc_mode = output->modes[i];
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+
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+ if (base->width != crtc_mode->width ||
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+ base->height != crtc_mode->height)
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+ return FALSE;
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+ }
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+
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+ return TRUE;
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+}
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+
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+static void
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+maybe_add_fallback_modes (MetaOutput *output,
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+ MetaGpuKms *gpu_kms)
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+{
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+ MetaOutputKms *output_kms = output->driver_private;
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+
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+ if (!output_kms->has_scaling)
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+ return;
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+
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+ if (output->n_modes == 0)
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+ return;
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+
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+ if (output_kms->connector->connector_type == DRM_MODE_CONNECTOR_eDP &&
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+ !are_all_modes_equally_sized (output))
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+ return;
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+
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+ add_common_modes (output, gpu_kms);
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+}
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+
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static gboolean
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init_output_modes (MetaOutput *output,
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MetaGpuKms *gpu_kms,
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@@ -528,13 +565,7 @@ init_output_modes (MetaOutput *output,
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output->preferred_mode = output->modes[i];
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}
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- /* FIXME: MSC feature bit? */
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- /* Presume that if the output supports scaling, then we have
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- * a panel fitter capable of adjusting any mode to suit.
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- */
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- if (output_kms->has_scaling)
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- add_common_modes (output, gpu_kms);
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-
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+ maybe_add_fallback_modes (output, gpu_kms);
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if (!output->modes)
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{
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g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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--
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2.37.1
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