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ecore_drm: Check for currently used CRTC first before searching others 

If we have a CRTC already configured save the work to search for a new
crtc and encoder combination that works with this connector. Just use what
we have.

Also always check if the CRTC is already allocated for a different connection
before using it.
This commit is contained in:
Stefan Schmidt 2014-07-01 15:01:38 +02:00
parent 64d54ed964
commit a7428edeb4
1 changed files with 27 additions and 6 deletions
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33
src/lib/ecore_drm/ecore_drm_output.c
View File

@ -201,31 +201,52 @@ _ecore_drm_output_software_render(Ecore_Drm_Output *output)
if (!output->current_mode) return;
}
static int
static int
_ecore_drm_output_crtc_find(Ecore_Drm_Device *dev, drmModeRes *res, drmModeConnector *conn)
{
drmModeEncoder *enc;
unsigned int p;
int i = 0, j = 0;
int i, j;
int crtc = -1;
/* Trying to first use the currently active encoder and crtc combination to avoid a
* full modeset */
if (conn->encoder_id)
enc = drmModeGetEncoder(dev->drm.fd, conn->encoder_id);
else
enc = NULL;
if (enc && enc->crtc_id)
{
crtc = enc->crtc_id;
drmModeFreeEncoder(enc);
/* Check is this CRTC is already allocated */
if (!(dev->crtc_allocator & (1 << crtc)))
return crtc;
}
/* We did not find an existing encoder + crtc combination. Loop through all of them until we
* find the first working combination */
for (j = 0; j < conn->count_encoders; j++)
{
/* get the encoder on this connector */
if (!(enc = drmModeGetEncoder(dev->drm.fd, conn->encoders[j])))
{
ERR("Failed to get encoder: %m");
return -1;
WRN("Failed to get encoder: %m");
continue;
}
p = enc->possible_crtcs;
drmModeFreeEncoder(enc);
/* Walk over all CRTCs */
for (i = 0; i < res->count_crtcs; i++)
{
if ((p & (1 << i)) &&
/* Does the CRTC match the list of possible CRTCs from the encoder? */
if ((p & (1 << i)) &&
(!(dev->crtc_allocator & (1 << res->crtcs[i]))))
{
return i;
return res->crtcs[i];
}
}
}