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authorShawn Guo <shawn.guo@linaro.org>2017-02-07 17:16:13 +0800
committerDaniel Vetter <daniel.vetter@ffwll.ch>2017-02-07 21:43:19 +0100
commit84e354839b158d87318eb7fa9828d52baceb23c3 (patch)
tree62060e4e2547b60aee8a7a2dfca0022696d91424 /include/drm/drm_crtc.h
parentda7bdda2afdf1ae58546218b50771c2c646bb079 (diff)
downloadlinux-84e354839b158d87318eb7fa9828d52baceb23c3.tar.bz2
drm: add vblank hooks to struct drm_crtc_funcs
The vblank is mostly CRTC specific and implemented as part of CRTC driver. Let's keep the vblank hooks struct drm_driver for legacy drivers, and add corresponding hooks in struct drm_crtc_funcs. These hooks take struct drm_crtc pointer as argument, and will be called by core vblank handling code for DRIVER_MODESET drivers. The new hooks get plugged into core by adding wrapper functions for vblank handling code. The .get_vblank_counter hook is effectively optional, as we provide drm_vblank_no_hw_counter() as the default fallback in the wrapper function. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Reviewed-by: Andrzej Hajda <a.hajda@samsung.com> Acked-by: Thierry Reding <treding@nvidia.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1486458995-31018-2-git-send-email-shawnguo@kernel.org
Diffstat (limited to 'include/drm/drm_crtc.h')
-rw-r--r--include/drm/drm_crtc.h44
1 files changed, 44 insertions, 0 deletions
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index c38a572c16aa..bda9347554a1 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -608,6 +608,50 @@ struct drm_crtc_funcs {
*/
void (*atomic_print_state)(struct drm_printer *p,
const struct drm_crtc_state *state);
+
+ /**
+ * @get_vblank_counter:
+ *
+ * Driver callback for fetching a raw hardware vblank counter for the
+ * CRTC. It's meant to be used by new drivers as the replacement of
+ * &drm_driver.get_vblank_counter hook.
+ *
+ * This callback is optional. If a device doesn't have a hardware
+ * counter, the driver can simply leave the hook as NULL. The DRM core
+ * will account for missed vblank events while interrupts where disabled
+ * based on system timestamps.
+ *
+ * Wraparound handling and loss of events due to modesetting is dealt
+ * with in the DRM core code, as long as drivers call
+ * drm_crtc_vblank_off() and drm_crtc_vblank_on() when disabling or
+ * enabling a CRTC.
+ *
+ * Returns:
+ *
+ * Raw vblank counter value.
+ */
+ u32 (*get_vblank_counter)(struct drm_crtc *crtc);
+
+ /**
+ * @enable_vblank:
+ *
+ * Enable vblank interrupts for the CRTC. It's meant to be used by
+ * new drivers as the replacement of &drm_driver.enable_vblank hook.
+ *
+ * Returns:
+ *
+ * Zero on success, appropriate errno if the vblank interrupt cannot
+ * be enabled.
+ */
+ int (*enable_vblank)(struct drm_crtc *crtc);
+
+ /**
+ * @disable_vblank:
+ *
+ * Disable vblank interrupts for the CRTC. It's meant to be used by
+ * new drivers as the replacement of &drm_driver.disable_vblank hook.
+ */
+ void (*disable_vblank)(struct drm_crtc *crtc);
};
/**