drm/i915: program WM_LINETIME on Haswell
The line time can be programmed according to the number of horizontal
pixels vs effective pixel rate ratio.
v2: improve comment as per Chris Wilson suggestion
v3: incorporate latest changes in specs.
v4: move into wm update routine, also mention that the same routine can
program IPS watermarks. We do not have their enablement code yet, nor
handle the required clock settings at the moment, so this patch won't
program those values for now.
Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index a5bb5b6..0ad1bb38 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -454,6 +454,8 @@
extern void intel_update_sprite_watermarks(struct drm_device *dev, int pipe,
uint32_t sprite_width,
int pixel_size);
+extern void intel_update_linetime_watermarks(struct drm_device *dev, int pipe,
+ struct drm_display_mode *mode);
extern int intel_sprite_set_colorkey(struct drm_device *dev, void *data,
struct drm_file *file_priv);