drm/amd/display: Add DSC support for Navi (v2)

Add support for DCN2 DSC (Display Stream Compression)

HW Blocks:

 +--------++------+       +----------+
 | HUBBUB || HUBP |  <--  | MMHUBBUB |
 +--------++------+       +----------+
        |                     ^
        v                     |
    +--------+            +--------+
    |  DPP   |            |  DWB   |
    +--------+            +--------+
        |
        v                      ^
    +--------+                 |
    |  MPC   |                 |
    +--------+                 |
        |                      |
        v                      |
    +-------+      +-------+   |
    |  OPP  | <--> |  DSC  |   |
    +-------+      +-------+   |
        |                      |
        v                      |
    +--------+                /
    |  OPTC  |  --------------
    +--------+
        |
        v
    +--------+       +--------+
    |  DIO   |       |  DCCG  |
    +--------+       +--------+

v2: rebase (Alex)

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

2 files changed, 76 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
index dfa235aeed89..8c6d99c61f35 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -49,6 +49,9 @@
 #include "clk_mgr.h"
 
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+#include "dsc.h"
+#endif
 
 #define DC_LOGGER_INIT(logger)
 
@@ -347,6 +350,61 @@ void dcn10_log_hw_state(struct dc *dc,
 	}
 	DTN_INFO("\n");
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	DTN_INFO("DSC: CLOCK_EN  SLICE_WIDTH  Bytes_pp\n");
+	for (i = 0; i < pool->res_cap->num_dsc; i++) {
+		struct display_stream_compressor *dsc = pool->dscs[i];
+		struct dcn_dsc_state s = {0};
+
+		dsc->funcs->dsc_read_state(dsc, &s);
+		DTN_INFO("[%d]: %-9d %-12d %-10d\n",
+		dsc->inst,
+			s.dsc_clock_en,
+			s.dsc_slice_width,
+			s.dsc_bytes_per_pixel);
+		DTN_INFO("\n");
+	}
+	DTN_INFO("\n");
+
+	DTN_INFO("S_ENC: DSC_MODE  SEC_GSP7_LINE_NUM"
+			"  VBID6_LINE_REFERENCE  VBID6_LINE_NUM  SEC_GSP7_ENABLE  SEC_STREAM_ENABLE\n");
+	for (i = 0; i < pool->stream_enc_count; i++) {
+		struct stream_encoder *enc = pool->stream_enc[i];
+		struct enc_state s = {0};
+
+		if (enc->funcs->enc_read_state) {
+			enc->funcs->enc_read_state(enc, &s);
+			DTN_INFO("[%-3d]: %-9d %-18d %-21d %-15d %-16d %-17d\n",
+				enc->id,
+				s.dsc_mode,
+				s.sec_gsp7_line_num,
+				s.vbid6_line_reference,
+				s.vbid6_line_num,
+				s.sec_gsp7_enable,
+				s.sec_stream_enable);
+			DTN_INFO("\n");
+		}
+	}
+	DTN_INFO("\n");
+
+	DTN_INFO("L_ENC: DPHY_FEC_EN  DPHY_FEC_READY_SHADOW  DPHY_FEC_ACTIVE_STATUS\n");
+	for (i = 0; i < dc->link_count; i++) {
+		struct link_encoder *lenc = dc->links[i]->link_enc;
+
+		struct link_enc_state s = {0};
+
+		if (lenc->funcs->read_state) {
+			lenc->funcs->read_state(lenc, &s);
+			DTN_INFO("[%-3d]: %-12d %-22d %-22d\n",
+				i,
+				s.dphy_fec_en,
+				s.dphy_fec_ready_shadow,
+				s.dphy_fec_active_status);
+			DTN_INFO("\n");
+		}
+	}
+	DTN_INFO("\n");
+#endif
 
 	DTN_INFO("\nCALCULATED Clocks: dcfclk_khz:%d  dcfclk_deep_sleep_khz:%d  dispclk_khz:%d\n"
 		"dppclk_khz:%d  max_supported_dppclk_khz:%d  fclk_khz:%d  socclk_khz:%d\n\n",
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c
index e4b850a2d31f..b3fc71648d16 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c
@@ -1507,10 +1507,28 @@ void dcn10_timing_generator_init(struct optc *optc1)
 	optc1->comb_opp_id = 0xf;
 }
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+/* "Containter" vs. "pixel" is a concept within HW blocks, mostly those closer to the back-end. It works like this:
+ *
+ * - In most of the formats (RGB or YCbCr 4:4:4, 4:2:2 uncompressed and DSC 4:2:2 Simple) pixel rate is the same as
+ *   containter rate.
+ *
+ * - In 4:2:0 (DSC or uncompressed) there are two pixels per container, hence the target container rate has to be
+ *   halved to maintain the correct pixel rate.
+ *
+ * - Unlike 4:2:2 uncompressed, DSC 4:2:2 Native also has two pixels per container (this happens when DSC is applied
+ *   to it) and has to be treated the same as 4:2:0, i.e. target containter rate has to be halved in this case as well.
+ *
+ */
+#endif
 bool optc1_is_two_pixels_per_containter(const struct dc_crtc_timing *timing)
 {
 	bool two_pix = timing->pixel_encoding == PIXEL_ENCODING_YCBCR420;
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	two_pix = two_pix || (timing->flags.DSC && timing->pixel_encoding == PIXEL_ENCODING_YCBCR422
+			&& !timing->dsc_cfg.ycbcr422_simple);
+#endif
 	return two_pix;
 }