On 21/05/2021 15:49, Vinod Koul wrote:
DSC needs some configuration from device tree, add support to read and
store these params and add DSC structures in msm_drv
Signed-off-by: Vinod Koul <vk...@kernel.org>
---
drivers/gpu/drm/msm/dsi/dsi_host.c | 170 +++++++++++++++++++++++++++++
drivers/gpu/drm/msm/msm_drv.h | 32 ++++++
2 files changed, 202 insertions(+)
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c
b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 8a10e4343281..864d3c655e73 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -156,6 +156,7 @@ struct msm_dsi_host {
struct regmap *sfpb;
struct drm_display_mode *mode;
+ struct msm_display_dsc_config *dsc;
/* connected device info */
struct device_node *device_node;
@@ -1744,6 +1745,168 @@ static int dsi_host_parse_lane_data(struct msm_dsi_host
*msm_host,
return -EINVAL;
}
+static u32 dsi_dsc_rc_buf_thresh[DSC_NUM_BUF_RANGES - 1] = {
+ 0x0e, 0x1c, 0x2a, 0x38, 0x46, 0x54, 0x62,
+ 0x69, 0x70, 0x77, 0x79, 0x7b, 0x7d, 0x7e
+};
I think we should move this table to a generic place. AMD and Intel DSC
code uses the same table, shifted by 6 (and both of those drivers shift
it before writing to the HW). Intel modifies this table for 6bpp case.
AMD seems to use it as is.
+
+/* only 8bpc, 8bpp added */
+static char min_qp[DSC_NUM_BUF_RANGES] = {
+ 0, 0, 1, 1, 3, 3, 3, 3, 3, 3, 5, 5, 5, 7, 13
+};
+
+static char max_qp[DSC_NUM_BUF_RANGES] = {
+ 4, 4, 5, 6, 7, 7, 7, 8, 9, 10, 11, 12, 13, 13, 15
+};
+
+static char bpg_offset[DSC_NUM_BUF_RANGES] = {
+ 2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -12, -12, -12, -12
+};
And these parameters seem to be generic too. Intel DSC code contains
them in a bit different form. Should we probably move them to the
drm_dsc.c and use the tables the generic location?
AMD drivers uses a bit different values at the first glance, so let's
stick with Intel version.
+
+static int dsi_populate_dsc_params(struct msm_display_dsc_config *dsc)
+{
+ int i;
+
+ dsc->drm.rc_model_size = 8192;
+ dsc->drm.first_line_bpg_offset = 15;
+ dsc->drm.rc_edge_factor = 6;
+ dsc->drm.rc_tgt_offset_high = 3;
+ dsc->drm.rc_tgt_offset_low = 3;
+ dsc->drm.simple_422 = 0;
+ dsc->drm.convert_rgb = 1;
+ dsc->drm.vbr_enable = 0;
+
+ /* handle only bpp = bpc = 8 */
+ for (i = 0; i < DSC_NUM_BUF_RANGES - 1 ; i++)
+ dsc->drm.rc_buf_thresh[i] = dsi_dsc_rc_buf_thresh[i];
+
+ for (i = 0; i < DSC_NUM_BUF_RANGES; i++) {
+ dsc->drm.rc_range_params[i].range_min_qp = min_qp[i];
+ dsc->drm.rc_range_params[i].range_max_qp = max_qp[i];
+ dsc->drm.rc_range_params[i].range_bpg_offset = bpg_offset[i];
+ }
+
+ dsc->drm.initial_offset = 6144;
+ dsc->drm.initial_xmit_delay = 512;
+ dsc->drm.initial_scale_value = 32;
+ dsc->drm.first_line_bpg_offset = 12;
+ dsc->drm.line_buf_depth = dsc->drm.bits_per_component + 1;
+
+ /* bpc 8 */
+ dsc->drm.flatness_min_qp = 3;
+ dsc->drm.flatness_max_qp = 12;
+ dsc->det_thresh_flatness = 7;
+ dsc->drm.rc_quant_incr_limit0 = 11;
+ dsc->drm.rc_quant_incr_limit1 = 11;
+ dsc->drm.mux_word_size = DSC_MUX_WORD_SIZE_8_10_BPC;
+
+ /* FIXME: need to call drm_dsc_compute_rc_parameters() so that rest of
+ * params are calculated
+ */
+
+ i = dsc->drm.slice_width % 3;
+ switch (i) {
+ case 0:
+ dsc->slice_last_group_size = 2;
+ break;
+
+ case 1:
+ dsc->slice_last_group_size = 0;
+ break;
+
+ case 2:
+ dsc->slice_last_group_size = 0;
+ break;
+
+ default:
+ break;
+ }
+
+ return 0;
+}
+
--
With best wishes
Dmitry
