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output/kms: Replace common mode bandwidth check with clock check

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The pixel clock determines how fast pixels can be processed. When adding
non-native common modes, avoid adding modes that exceed the max pixel
clock frequency of the native modes. Avoiding these avoids potential
mode setting failures where the GPU can't handle the modeline since the
configured pixel clock is too fast. This replaces the "bandwidth" check
which used the number of pixels and refresh rate, which wasn't enough to
avoid incompatible modes.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2492>
This commit is contained in:
Jonas Ådahl 2022-07-01 13:55:29 +02:00
parent 53b52e26f5
commit 43860110ff
3 changed files with 5 additions and 8 deletions
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1
src/backends/meta-crtc-mode.h
View file

@ -55,6 +55,7 @@ typedef struct _MetaCrtcModeInfo
int height;
float refresh_rate;
int64_t vblank_duration_us;
uint32_t pixel_clock_khz;
MetaCrtcModeFlag flags;
} MetaCrtcModeInfo;

1
src/backends/native/meta-crtc-mode-kms.c
View file

@ -57,6 +57,7 @@ meta_crtc_mode_kms_new (MetaKmsMode *kms_mode,
meta_calculate_drm_mode_refresh_rate (drm_mode);
crtc_mode_info->vblank_duration_us =
meta_calculate_drm_mode_vblank_duration_us (drm_mode);
crtc_mode_info->pixel_clock_khz = drm_mode->clock;
crtc_mode_name = g_strndup (drm_mode->name, DRM_DISPLAY_MODE_LEN);
mode_kms = g_object_new (META_TYPE_CRTC_MODE_KMS,

11
src/backends/native/meta-output-kms.c
View file

@ -178,7 +178,7 @@ add_common_modes (MetaOutputInfo *output_info,
unsigned max_hdisplay = 0;
unsigned max_vdisplay = 0;
float max_refresh_rate = 0.0;
float max_bandwidth = 0.0;
uint32_t max_pixel_clock = 0;
MetaKmsDevice *kms_device;
MetaKmsModeFlag flag_filter;
GList *l;
@ -187,14 +187,11 @@ add_common_modes (MetaOutputInfo *output_info,
{
const MetaCrtcModeInfo *crtc_mode_info =
meta_crtc_mode_get_info (output_info->modes[i]);
float bandwidth;
bandwidth = crtc_mode_info->refresh_rate * crtc_mode_info->width *
crtc_mode_info->height;
max_hdisplay = MAX (max_hdisplay, crtc_mode_info->width);
max_vdisplay = MAX (max_vdisplay, crtc_mode_info->height);
max_refresh_rate = MAX (max_refresh_rate, crtc_mode_info->refresh_rate);
max_bandwidth = MAX (max_bandwidth, bandwidth);
max_pixel_clock = MAX (max_pixel_clock, crtc_mode_info->pixel_clock_khz);
}
max_refresh_rate = MAX (max_refresh_rate, 60.0);
@ -213,7 +210,6 @@ add_common_modes (MetaOutputInfo *output_info,
{
MetaKmsMode *fallback_mode = l->data;
const drmModeModeInfo *drm_mode;
float bandwidth;
float refresh_rate;
gboolean is_duplicate = FALSE;
@ -222,11 +218,10 @@ add_common_modes (MetaOutputInfo *output_info,
drm_mode = meta_kms_mode_get_drm_mode (fallback_mode);
refresh_rate = meta_calculate_drm_mode_refresh_rate (drm_mode);
bandwidth = refresh_rate * drm_mode->hdisplay * drm_mode->vdisplay;
if (drm_mode->hdisplay > max_hdisplay ||
drm_mode->vdisplay > max_vdisplay ||
refresh_rate > max_refresh_rate ||
bandwidth > max_bandwidth)
drm_mode->clock > max_pixel_clock)
continue;
for (i = 0; i < output_info->n_modes; i++)