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kms/crtc: Read gamma state when prediction failed

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If we did a mode set, the gamma may have been changed by the kernel, and
if we didn't also update the gamma in the same transaction, we have no
way to predict the current gamma ramp state. In this case, read the
gamma state directly from KMS.

This should be relatively harmless regarding the race conditions the
state prediction was meant to solve, as the worst case is we get none or
out of date gamma ramps; and since this is for when gamma ramps are not
updated at mode setting time, we'd get intermediate gamma state to begin
with, so it's not worse than what we currently do anyway.

Fixes: https://gitlab.gnome.org/GNOME/mutter/issues/851

https://gitlab.gnome.org/GNOME/mutter/merge_requests/840
This commit is contained in:
Jonas Ådahl 2019-10-10 10:47:05 +02:00
parent 1cc249fe18
commit 1b4709794e
1 changed files with 43 additions and 3 deletions
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46
src/backends/native/meta-kms-crtc.c
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@ -143,14 +143,26 @@ meta_kms_crtc_update_state (MetaKmsCrtc *crtc)
drmModeFreeCrtc (drm_crtc);
}
static void
clear_gamma_state (MetaKmsCrtc *crtc)
{
crtc->current_state.gamma.size = 0;
g_clear_pointer (&crtc->current_state.gamma.red, g_free);
g_clear_pointer (&crtc->current_state.gamma.green, g_free);
g_clear_pointer (&crtc->current_state.gamma.blue, g_free);
}
void
meta_kms_crtc_predict_state (MetaKmsCrtc *crtc,
MetaKmsUpdate *update)
{
gboolean is_gamma_valid;
GList *mode_sets;
GList *crtc_gammas;
GList *l;
is_gamma_valid = TRUE;
mode_sets = meta_kms_update_get_mode_sets (update);
for (l = mode_sets; l; l = l->next)
{
@ -178,6 +190,8 @@ meta_kms_crtc_predict_state (MetaKmsCrtc *crtc,
crtc->current_state.drm_mode = (drmModeModeInfo) { 0 };
}
is_gamma_valid = FALSE;
break;
}
@ -196,8 +210,36 @@ meta_kms_crtc_predict_state (MetaKmsCrtc *crtc,
g_memdup (gamma->green, gamma->size * sizeof (uint16_t));
crtc->current_state.gamma.blue =
g_memdup (gamma->blue, gamma->size * sizeof (uint16_t));
is_gamma_valid = TRUE;
break;
}
if (!is_gamma_valid)
{
if (crtc->current_state.is_drm_mode_valid)
{
MetaKmsImplDevice *impl_device;
drmModeCrtc *drm_crtc;
impl_device = meta_kms_device_get_impl_device (crtc->device);
drm_crtc = drmModeGetCrtc (meta_kms_impl_device_get_fd (impl_device),
crtc->id);
if (drm_crtc)
{
read_gamma_state (crtc, impl_device, drm_crtc);
drmModeFreeCrtc (drm_crtc);
}
else
{
clear_gamma_state (crtc);
}
}
else
{
clear_gamma_state (crtc);
}
}
}
MetaKmsCrtc *
@ -220,9 +262,7 @@ meta_kms_crtc_finalize (GObject *object)
{
MetaKmsCrtc *crtc = META_KMS_CRTC (object);
g_clear_pointer (&crtc->current_state.gamma.red, g_free);
g_clear_pointer (&crtc->current_state.gamma.green, g_free);
g_clear_pointer (&crtc->current_state.gamma.blue, g_free);
clear_gamma_state (crtc);
G_OBJECT_CLASS (meta_kms_crtc_parent_class)->finalize (object);
}