diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2014-01-03 01:27:33 +0400 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2014-01-14 17:35:02 +0400 |
| commit | db5f7a6e78303fd96dc87487d6976145f70ab84a (patch) | |
| tree | 67e1794359724795088e92c4ded11fff46e58007 /include/drm | |
| parent | ff5009ef8df87908a956412619e4f1bf1078ef5d (diff) | |
| download | linux-db5f7a6e78303fd96dc87487d6976145f70ab84a.tar.xz | |
drm: provide a helper for the encoder possible_crtcs mask
The encoder possible_crtcs mask identifies which CRTCs can be bound to
a particular encoder. Each bit from bit 0 defines an index in the list
of CRTCs held in the DRM mode_config crtc_list. Rather than having
drivers trying to track the position of their CRTCs in the list, expose
the code which already exists for calculating the appropriate mask bit
for a CRTC.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
[treding@nvidia.com: add drm_crtc_index(), move to core]
Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'include/drm')
| -rw-r--r-- | include/drm/drm_crtc.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index f32c5cd51f41..4f2e3e82f014 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -929,6 +929,19 @@ extern int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc, const struct drm_crtc_funcs *funcs); extern void drm_crtc_cleanup(struct drm_crtc *crtc); +extern unsigned int drm_crtc_index(struct drm_crtc *crtc); + +/** + * drm_crtc_mask - find the mask of a registered CRTC + * @crtc: CRTC to find mask for + * + * Given a registered CRTC, return the mask bit of that CRTC for an + * encoder's possible_crtcs field. + */ +static inline uint32_t drm_crtc_mask(struct drm_crtc *crtc) +{ + return 1 << drm_crtc_index(crtc); +} extern void drm_connector_ida_init(void); extern void drm_connector_ida_destroy(void); |