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| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2013-08-01 16:18:55 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-08-05 19:04:18 +0200 |
| commit | 37126462a4feadeb3ff08c4b308a28e4db8c83a7 (patch) | |
| tree | f3d3f93ddf5eaceefd221720b0162938c09c35dc /drivers/gpu/drm/i915/intel_pm.c | |
| parent | b0aea5dca064176a626dc2a83727c60ace31ee6d (diff) | |
| download | talos-op-linux-37126462a4feadeb3ff08c4b308a28e4db8c83a7.tar.gz talos-op-linux-37126462a4feadeb3ff08c4b308a28e4db8c83a7.zip | |
drm/i915: Add comments about units of latency values
All the ILK+ WM compute functions take the latency values in 0.1us
units. Add a few comments to remind people about that.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_pm.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_pm.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index ccaadc87b6bb..c20d68298072 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -2123,6 +2123,7 @@ static uint32_t ilk_pipe_pixel_rate(struct drm_device *dev, return pixel_rate; } +/* latency must be in 0.1us units. */ static uint32_t ilk_wm_method1(uint32_t pixel_rate, uint8_t bytes_per_pixel, uint32_t latency) { @@ -2137,6 +2138,7 @@ static uint32_t ilk_wm_method1(uint32_t pixel_rate, uint8_t bytes_per_pixel, return ret; } +/* latency must be in 0.1us units. */ static uint32_t ilk_wm_method2(uint32_t pixel_rate, uint32_t pipe_htotal, uint32_t horiz_pixels, uint8_t bytes_per_pixel, uint32_t latency) @@ -2200,7 +2202,10 @@ enum hsw_data_buf_partitioning { HSW_DATA_BUF_PART_5_6, }; -/* For both WM_PIPE and WM_LP. */ +/* + * For both WM_PIPE and WM_LP. + * mem_value must be in 0.1us units. + */ static uint32_t ilk_compute_pri_wm(struct hsw_pipe_wm_parameters *params, uint32_t mem_value, bool is_lp) @@ -2227,7 +2232,10 @@ static uint32_t ilk_compute_pri_wm(struct hsw_pipe_wm_parameters *params, return min(method1, method2); } -/* For both WM_PIPE and WM_LP. */ +/* + * For both WM_PIPE and WM_LP. + * mem_value must be in 0.1us units. + */ static uint32_t ilk_compute_spr_wm(struct hsw_pipe_wm_parameters *params, uint32_t mem_value) { @@ -2247,7 +2255,10 @@ static uint32_t ilk_compute_spr_wm(struct hsw_pipe_wm_parameters *params, return min(method1, method2); } -/* For both WM_PIPE and WM_LP. */ +/* + * For both WM_PIPE and WM_LP. + * mem_value must be in 0.1us units. + */ static uint32_t ilk_compute_cur_wm(struct hsw_pipe_wm_parameters *params, uint32_t mem_value) { |
