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| author | Jani Nikula <jani.nikula@intel.com> | 2020-12-08 13:33:53 +0100 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2020-12-10 09:49:47 +0100 |
| commit | a8f65ba3c2655125c4933f2f6a7e1f4938859bba (patch) | |
| tree | f8b5ceff240791b5b7798d659e668d68bf35c8eb | |
| parent | drm/i915/dsc: make rc_model_size an encoder defined value (diff) | |
| download | linux-a8f65ba3c2655125c4933f2f6a7e1f4938859bba.tar.xz linux-a8f65ba3c2655125c4933f2f6a7e1f4938859bba.zip | |
drm/dsc: add helper for calculating rc buffer size from DPCD
Add a helper for calculating the rc buffer size from the DCPD offsets
DP_DSC_RC_BUF_BLK_SIZE and DP_DSC_RC_BUF_SIZE.
Cc: Alex Deucher <alexdeucher@gmail.com>
Cc: Harry Wentland <hwentlan@amd.com>
Cc: Manasi Navare <manasi.d.navare@intel.com>
Cc: Vandita Kulkarni <vandita.kulkarni@intel.com>
Reviewed-by: Vandita Kulkarni <vandita.kulkarni@intel.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/6c6aee22740fe7a8cf2b8e768bfda378850cf59a.1607429866.git.jani.nikula@intel.com
| -rw-r--r-- | drivers/gpu/drm/drm_dsc.c | 27 | ||||
| -rw-r--r-- | include/drm/drm_dsc.h | 1 |
2 files changed, 28 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_dsc.c b/drivers/gpu/drm/drm_dsc.c index 09afbc01ea94..ff602f7ec65b 100644 --- a/drivers/gpu/drm/drm_dsc.c +++ b/drivers/gpu/drm/drm_dsc.c @@ -50,6 +50,33 @@ void drm_dsc_dp_pps_header_init(struct dp_sdp_header *pps_header) EXPORT_SYMBOL(drm_dsc_dp_pps_header_init); /** + * drm_dsc_dp_rc_buffer_size - get rc buffer size in bytes + * @rc_buffer_block_size: block size code, according to DPCD offset 62h + * @rc_buffer_size: number of blocks - 1, according to DPCD offset 63h + * + * return: + * buffer size in bytes, or 0 on invalid input + */ +int drm_dsc_dp_rc_buffer_size(u8 rc_buffer_block_size, u8 rc_buffer_size) +{ + int size = 1024 * (rc_buffer_size + 1); + + switch (rc_buffer_block_size) { + case DP_DSC_RC_BUF_BLK_SIZE_1: + return 1 * size; + case DP_DSC_RC_BUF_BLK_SIZE_4: + return 4 * size; + case DP_DSC_RC_BUF_BLK_SIZE_16: + return 16 * size; + case DP_DSC_RC_BUF_BLK_SIZE_64: + return 64 * size; + default: + return 0; + } +} +EXPORT_SYMBOL(drm_dsc_dp_rc_buffer_size); + +/** * drm_dsc_pps_payload_pack() - Populates the DSC PPS * * @pps_payload: diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h index 732f32740c86..e66560174ff1 100644 --- a/include/drm/drm_dsc.h +++ b/include/drm/drm_dsc.h @@ -602,6 +602,7 @@ struct drm_dsc_pps_infoframe { } __packed; void drm_dsc_dp_pps_header_init(struct dp_sdp_header *pps_header); +int drm_dsc_dp_rc_buffer_size(u8 rc_buffer_block_size, u8 rc_buffer_size); void drm_dsc_pps_payload_pack(struct drm_dsc_picture_parameter_set *pps_sdp, const struct drm_dsc_config *dsc_cfg); int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg); |