openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

drm/armada: add CRTC mode validation 

Add CRTC mode validation to reject modes that the CRTC does not support.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Russell King 2018-07-14 11:17:45 +01:00
parent 0ab17499b1
commit 7f07ce0f04
1 changed files with 20 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/gpu/drm/armada/armada_crtc.c
View File

@ -168,6 +168,25 @@ static void armada_drm_update_gamma(struct drm_crtc *crtc)
}
}
static enum drm_mode_status armada_drm_crtc_mode_valid(struct drm_crtc *crtc,
const struct drm_display_mode *mode)
{
if (mode->vscan > 1)
return MODE_NO_VSCAN;
if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
return MODE_NO_DBLESCAN;
if (mode->flags & DRM_MODE_FLAG_HSKEW)
return MODE_H_ILLEGAL;
if (mode->flags & (DRM_MODE_FLAG_BCAST | DRM_MODE_FLAG_PIXMUX |
DRM_MODE_FLAG_CLKDIV2))
return MODE_BAD;
return MODE_OK;
}
/* The mode_config.mutex will be held for this call */
static bool armada_drm_crtc_mode_fixup(struct drm_crtc *crtc,
const struct drm_display_mode *mode, struct drm_display_mode *adj)
@ -499,6 +518,7 @@ static void armada_drm_crtc_atomic_enable(struct drm_crtc *crtc,
}
static const struct drm_crtc_helper_funcs armada_crtc_helper_funcs = {
.mode_valid = armada_drm_crtc_mode_valid,
.mode_fixup = armada_drm_crtc_mode_fixup,
.mode_set_nofb = armada_drm_crtc_mode_set_nofb,
.atomic_check = armada_drm_crtc_atomic_check,