drm/amd/display: fix image corruption with ODM 2:1 DSC 2 slice

[ Upstream commit df8e34ac27e8a0d8dce364628226c5619693c3fd ]

[why]
When combining two or more pipes in DSC mode, there will always be more
than 1 slice per line.  In this case, as per DSC rules, the sink device
is expecting that the ICH is reset at the end of each slice line (i.e.
ICH_RESET_AT_END_OF_LINE must be configured based on the number of
slices at the output of ODM).  It is recommended that software set
ICH_RESET_AT_END_OF_LINE = 0xF for each DSC in the ODM combine.  However
the current code only set ICH_RESET_AT_END_OF_LINE = 0xF when number of
slice per DSC engine is greater than 1 instead of number of slice per
output after ODM combine.

[how]
Add is_odm in dsc config. Set ICH_RESET_AT_END_OF_LINE = 0xF if either
is_odm or number of slice per DSC engine is greater than 1.

Signed-off-by: Wenjing Liu <Wenjing.Liu@amd.com>
Reviewed-by: Nikola Cornij <Nikola.Cornij@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
index 5d6cbaebebc039a3a197893f565b5a31b8c4b6c2..5641a9477d291900a9d0ba9e72af4d0e897bf9f7 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
@@ -400,6 +400,7 @@ void dp_set_dsc_on_stream(struct pipe_ctx *pipe_ctx, bool enable)
                dsc_cfg.pic_height = stream->timing.v_addressable + stream->timing.v_border_top + stream->timing.v_border_bottom;
                dsc_cfg.pixel_encoding = stream->timing.pixel_encoding;
                dsc_cfg.color_depth = stream->timing.display_color_depth;
+               dsc_cfg.is_odm = pipe_ctx->next_odm_pipe ? true : false;
                dsc_cfg.dc_dsc_cfg = stream->timing.dsc_cfg;
                ASSERT(dsc_cfg.dc_dsc_cfg.num_slices_h % opp_cnt == 0);
                dsc_cfg.dc_dsc_cfg.num_slices_h /= opp_cnt;
@@ -504,6 +505,7 @@ bool dp_set_dsc_pps_sdp(struct pipe_ctx *pipe_ctx, bool enable)
                dsc_cfg.pic_height = stream->timing.v_addressable + stream->timing.v_border_top + stream->timing.v_border_bottom;
                dsc_cfg.pixel_encoding = stream->timing.pixel_encoding;
                dsc_cfg.color_depth = stream->timing.display_color_depth;
+               dsc_cfg.is_odm = pipe_ctx->next_odm_pipe ? true : false;
                dsc_cfg.dc_dsc_cfg = stream->timing.dsc_cfg;
 
                DC_LOG_DSC(" ");

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dsc.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dsc.c
index 01040501d40e3989d80cbccb3a9a8cb3a9a66916..5c45c39662fbbb17a6e6686e8e98689adcf7d39d 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dsc.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dsc.c
@@ -351,6 +351,7 @@ static bool dsc_prepare_config(const struct dsc_config *dsc_cfg, struct dsc_reg_
        dsc_reg_vals->pps.block_pred_enable = dsc_cfg->dc_dsc_cfg.block_pred_enable;
        dsc_reg_vals->pps.line_buf_depth = dsc_cfg->dc_dsc_cfg.linebuf_depth;
        dsc_reg_vals->alternate_ich_encoding_en = dsc_reg_vals->pps.dsc_version_minor == 1 ? 0 : 1;
+       dsc_reg_vals->ich_reset_at_eol = (dsc_cfg->is_odm || dsc_reg_vals->num_slices_h > 1) ? 0xF : 0;
 
        // TODO: in addition to validating slice height (pic height must be divisible by slice height),
        // see what happens when the same condition doesn't apply for slice_width/pic_width.
@@ -513,7 +514,6 @@ static void dsc_update_from_dsc_parameters(struct dsc_reg_values *reg_vals, cons
                reg_vals->pps.rc_buf_thresh[i] = reg_vals->pps.rc_buf_thresh[i] >> 6;
 
        reg_vals->rc_buffer_model_size = dsc_params->rc_buffer_model_size;
-       reg_vals->ich_reset_at_eol = reg_vals->num_slices_h == 1 ? 0 : 0xf;
 }
 
 static void dsc_write_to_registers(struct display_stream_compressor *dsc, const struct dsc_reg_values *reg_vals)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
index 05b98eadc28993b9f711d5a7ac1590f95d72994f..bfa01137f8e091a63409139982fae5b5861286f9 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
@@ -2275,6 +2275,7 @@ static bool dcn20_validate_dsc(struct dc *dc, struct dc_state *new_ctx)
                                + stream->timing.v_border_bottom;
                dsc_cfg.pixel_encoding = stream->timing.pixel_encoding;
                dsc_cfg.color_depth = stream->timing.display_color_depth;
+               dsc_cfg.is_odm = pipe_ctx->next_odm_pipe ? true : false;
                dsc_cfg.dc_dsc_cfg = stream->timing.dsc_cfg;
                dsc_cfg.dc_dsc_cfg.num_slices_h /= opp_cnt;
 

diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/dsc.h b/drivers/gpu/drm/amd/display/dc/inc/hw/dsc.h
index 1ddb1c6fa1493c1ece0cdda16ef93d2c123be7f1..75ecfdc5d5cd277f7d29f2f9748a378fb812f191 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/inc/hw/dsc.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/dsc.h
@@ -36,6 +36,7 @@ struct dsc_config {
        uint32_t pic_height;
        enum dc_pixel_encoding pixel_encoding;
        enum dc_color_depth color_depth;  /* Bits per component */
+       bool is_odm;
        struct dc_dsc_config dc_dsc_cfg;
 };