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ecore-drm2: Add code to check if Atomic Modesettting is usable 

This code will detect the drm driver name and check that the kernel
itself is new enough to use Atomic Modesetting. This is needed as some
drivers (i915) do not handle Atomic Modesetting propertly without a
new enough kernel.

Signed-off-by: Chris Michael <cp.michael@samsung.com>
This commit is contained in:
Chris Michael 2016-09-22 10:34:03 -04:00
parent 7770bc17bb
commit 541be05bf2
1 changed files with 55 additions and 4 deletions
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59
src/lib/ecore_drm2/ecore_drm2_device.c
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@ -8,6 +8,12 @@
# define DRM_CAP_CURSOR_HEIGHT 0x9
#endif
#ifdef HAVE_ATOMIC_DRM
# include <sys/utsname.h>
#endif
Eina_Bool _ecore_drm2_use_atomic = EINA_FALSE;
static Eina_Bool
_cb_session_active(void *data, int type EINA_UNUSED, void *event)
{
@ -143,6 +149,50 @@ out:
return ret;
}
#ifdef HAVE_ATOMIC_DRM
static Eina_Bool
_ecore_drm2_atomic_usable(int fd)
{
drmVersion *drmver;
Eina_Bool ret = EINA_FALSE;
drmver = drmGetVersion(fd);
if (!drmver) return EINA_FALSE;
/* detect driver */
if ((!strcmp(drmver->name, "i915")) &&
(!strcmp(drmver->desc, "Intel Graphics")))
{
FILE *fp;
/* detect kernel version
* NB: In order for atomic modesetting to work properly for Intel,
* we need to be using a kernel >= 4.8.0 */
fp = fopen("/proc/sys/kernel/osrelease", "rb");
if (fp)
{
char buff[512];
int maj = 0, min = 0;
if (fgets(buff, sizeof(buff), fp))
{
if (sscanf(buff, "%i.%i.%*s", &maj, &min) == 2)
{
if ((maj >= 4) && (min >= 8))
ret = EINA_TRUE;
}
}
fclose(fp);
}
}
drmFreeVersion(drmver);
return ret;
}
#endif
EAPI Ecore_Drm2_Device *
ecore_drm2_device_find(const char *seat, unsigned int tty)
{
@ -191,6 +241,11 @@ ecore_drm2_device_open(Ecore_Drm2_Device *device)
DBG("Device Path: %s", device->path);
DBG("Device Fd: %d", device->fd);
#ifdef HAVE_ATOMIC_DRM
/* check that this system can do atomic */
_ecore_drm2_use_atomic = _ecore_drm2_atomic_usable(device->fd);
#endif
device->active_hdlr =
ecore_event_handler_add(ELPUT_EVENT_SESSION_ACTIVE,
_cb_session_active, device);
@ -199,10 +254,6 @@ ecore_drm2_device_open(Ecore_Drm2_Device *device)
ecore_event_handler_add(ELPUT_EVENT_DEVICE_CHANGE,
_cb_device_change, device);
/* NB: Not going to enable planes if we don't support atomic */
/* if (drmSetClientCap(device->fd, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1) < 0) */
/* ERR("Could not set Universal Plane support: %m"); */
return device->fd;
input_err: