drm/msm/dsi: add support for dsc data

Display Stream Compression (DSC) parameters need to be calculated. Add
helpers and struct msm_display_dsc_config in msm_drv for this
msm_display_dsc_config uses drm_dsc_config for DSC parameters.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Patchwork: https://patchwork.freedesktop.org/patch/480908/
Link: https://lore.kernel.org/r/20220406094031.1027376-2-vkoul@kernel.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index d51e70f..4a8a9b3 100644 (file)
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -31,6 +31,8 @@
 
 #define DSI_RESET_TOGGLE_DELAY_MS 20
 
+static int dsi_populate_dsc_params(struct msm_display_dsc_config *dsc);
+
 static int dsi_get_version(const void __iomem *base, u32 *major, u32 *minor)
 {
        u32 ver;
@@ -157,6 +159,7 @@ 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;
@@ -1722,6 +1725,133 @@ 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
+};
+
+/* 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
+};
+
+static int dsi_populate_dsc_params(struct msm_display_dsc_config *dsc)
+{
+       int mux_words_size;
+       int groups_per_line, groups_total;
+       int min_rate_buffer_size;
+       int hrd_delay;
+       int pre_num_extra_mux_bits, num_extra_mux_bits;
+       int slice_bits;
+       int target_bpp_x16;
+       int data;
+       int final_value, final_scale;
+       int i;
+
+       dsc->drm->rc_model_size = 8192;
+       dsc->drm->first_line_bpg_offset = 12;
+       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; /* Not bpp 12 */
+       if (dsc->drm->bits_per_pixel != 8)
+               dsc->drm->initial_offset = 2048;        /* bpp = 12 */
+
+       mux_words_size = 48;            /* bpc == 8/10 */
+       if (dsc->drm->bits_per_component == 12)
+               mux_words_size = 64;
+
+       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->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
+        */
+       groups_per_line = DIV_ROUND_UP(dsc->drm->slice_width, 3);
+       dsc->drm->slice_chunk_size = dsc->drm->slice_width * dsc->drm->bits_per_pixel / 8;
+       if ((dsc->drm->slice_width * dsc->drm->bits_per_pixel) % 8)
+               dsc->drm->slice_chunk_size++;
+
+       /* rbs-min */
+       min_rate_buffer_size =  dsc->drm->rc_model_size - dsc->drm->initial_offset +
+                               dsc->drm->initial_xmit_delay * dsc->drm->bits_per_pixel +
+                               groups_per_line * dsc->drm->first_line_bpg_offset;
+
+       hrd_delay = DIV_ROUND_UP(min_rate_buffer_size, dsc->drm->bits_per_pixel);
+
+       dsc->drm->initial_dec_delay = hrd_delay - dsc->drm->initial_xmit_delay;
+
+       dsc->drm->initial_scale_value = 8 * dsc->drm->rc_model_size /
+                                      (dsc->drm->rc_model_size - dsc->drm->initial_offset);
+
+       slice_bits = 8 * dsc->drm->slice_chunk_size * dsc->drm->slice_height;
+
+       groups_total = groups_per_line * dsc->drm->slice_height;
+
+       data = dsc->drm->first_line_bpg_offset * 2048;
+
+       dsc->drm->nfl_bpg_offset = DIV_ROUND_UP(data, (dsc->drm->slice_height - 1));
+
+       pre_num_extra_mux_bits = 3 * (mux_words_size + (4 * dsc->drm->bits_per_component + 4) - 2);
+
+       num_extra_mux_bits = pre_num_extra_mux_bits - (mux_words_size -
+                            ((slice_bits - pre_num_extra_mux_bits) % mux_words_size));
+
+       data = 2048 * (dsc->drm->rc_model_size - dsc->drm->initial_offset + num_extra_mux_bits);
+       dsc->drm->slice_bpg_offset = DIV_ROUND_UP(data, groups_total);
+
+       /* bpp * 16 + 0.5 */
+       data = dsc->drm->bits_per_pixel * 16;
+       data *= 2;
+       data++;
+       data /= 2;
+       target_bpp_x16 = data;
+
+       data = (dsc->drm->initial_xmit_delay * target_bpp_x16) / 16;
+       final_value =  dsc->drm->rc_model_size - data + num_extra_mux_bits;
+       dsc->drm->final_offset = final_value;
+
+       final_scale = 8 * dsc->drm->rc_model_size / (dsc->drm->rc_model_size - final_value);
+
+       data = (final_scale - 9) * (dsc->drm->nfl_bpg_offset + dsc->drm->slice_bpg_offset);
+       dsc->drm->scale_increment_interval = (2048 * dsc->drm->final_offset) / data;
+
+       dsc->drm->scale_decrement_interval = groups_per_line / (dsc->drm->initial_scale_value - 8);
+
+       return 0;
+}
+
 static int dsi_host_parse_dt(struct msm_dsi_host *msm_host)
 {
        struct device *dev = &msm_host->pdev->dev;

diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index cfe0866..f07c722 100644 (file)
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -30,6 +30,7 @@
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_fb_helper.h>
+#include <drm/drm_dsc.h>
 #include <drm/msm_drm.h>
 #include <drm/drm_gem.h>
 
@@ -106,6 +107,11 @@ struct msm_drm_thread {
        struct kthread_worker *worker;
 };
 
+/* DSC config */
+struct msm_display_dsc_config {
+       struct drm_dsc_config *drm;
+};
+
 struct msm_drm_private {
 
        struct drm_device *dev;