drm/amd/display: refactor DSC cap calculation for dcn35

why:
dcn35 currently uses a hardcoded DSC display clock value which is incorrect
for some asic types. Newer DCN versions retrieve dsc display clock from
clk_mgr. The same can be done for dcn35.

how:
Refactor the DSC cap calculation using pre-existing logic.
Handle ODM combine requirements in dc_dsc.c.
Replace hardcoded display clock with actual value retrieved from clk_mgr.

Reviewed-by: Nicholas Kazlauskas <[e-mail]>
Reviewed-by: Charlene Liu <[e-mail]>
Reviewed-by: Wenjing Liu <[e-mail]>
Signed-off-by: Mohit Bawa <[e-mail]>
Signed-off-by: Fangzhi Zuo <[e-mail]>
Tested-by: Dan Wheeler <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c

···
 	dcn35_update_clocks_update_dtb_dto(clk_mgr_int, context, clk_mgr->clks.ref_dtbclk_khz);
 }
 
+static unsigned int dcn35_get_max_clock_khz(struct clk_mgr *clk_mgr_base, enum clk_type clk_type)
+{
+	struct clk_mgr_internal *clk_mgr = TO_CLK_MGR_INTERNAL(clk_mgr_base);
+
+	unsigned int num_clk_levels;
+
+	switch (clk_type) {
+	case CLK_TYPE_DISPCLK:
+		num_clk_levels = clk_mgr->base.bw_params->clk_table.num_entries_per_clk.num_dispclk_levels;
+		return num_clk_levels ?
+				clk_mgr->base.bw_params->clk_table.entries[num_clk_levels - 1].dispclk_mhz * 1000 :
+				clk_mgr->base.boot_snapshot.dispclk;
+	case CLK_TYPE_DPPCLK:
+		num_clk_levels = clk_mgr->base.bw_params->clk_table.num_entries_per_clk.num_dppclk_levels;
+		return num_clk_levels ?
+				clk_mgr->base.bw_params->clk_table.entries[num_clk_levels - 1].dppclk_mhz * 1000 :
+				clk_mgr->base.boot_snapshot.dppclk;
+	case CLK_TYPE_DSCCLK:
+		num_clk_levels = clk_mgr->base.bw_params->clk_table.num_entries_per_clk.num_dispclk_levels;
+		return num_clk_levels ?
+				clk_mgr->base.bw_params->clk_table.entries[num_clk_levels - 1].dispclk_mhz * 1000 / 3 :
+				clk_mgr->base.boot_snapshot.dispclk / 3;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
 static struct clk_mgr_funcs dcn35_funcs = {
 	.get_dp_ref_clk_frequency = dce12_get_dp_ref_freq_khz,
 	.get_dtb_ref_clk_frequency = dcn31_get_dtb_ref_freq_khz,
···
 	.set_low_power_state = dcn35_set_low_power_state,
 	.exit_low_power_state = dcn35_exit_low_power_state,
 	.is_ips_supported = dcn35_is_ips_supported,
+	.get_max_clock_khz = dcn35_get_max_clock_khz,
 };
 
 struct clk_mgr_funcs dcn35_fpga_funcs = {

drivers/gpu/drm/amd/display/dc/dsc/dcn35/dcn35_dsc.c

···
 #include "reg_helper.h"
 
 static void dsc35_enable(struct display_stream_compressor *dsc, int opp_pipe);
+static void dsc35_get_single_enc_caps(struct dsc_enc_caps *dsc_enc_caps, unsigned int max_dscclk_khz);
 
 static const struct dsc_funcs dcn35_dsc_funcs = {
-	.dsc_get_enc_caps = dsc2_get_enc_caps,
 	.dsc_read_state = dsc2_read_state,
 	.dsc_read_reg_state = dsc2_read_reg_state,
 	.dsc_validate_stream = dsc2_validate_stream,
···
 	.dsc_disable = dsc2_disable,
 	.dsc_disconnect = dsc2_disconnect,
 	.dsc_wait_disconnect_pending_clear = dsc2_wait_disconnect_pending_clear,
+	.dsc_get_single_enc_caps = dsc35_get_single_enc_caps,
 };
 
 /* Macro definitios for REG_SET macros*/
···
 void dsc35_set_fgcg(struct dcn20_dsc *dsc20, bool enable)
 {
 	REG_UPDATE(DSC_TOP_CONTROL, DSC_FGCG_REP_DIS, !enable);
+}
+
+void dsc35_get_single_enc_caps(struct dsc_enc_caps *dsc_enc_caps, unsigned int max_dscclk_khz)
+{
+	dsc_enc_caps->dsc_version = 0x21; /* v1.2 - DP spec defined it in reverse order and we kept it */
+
+	dsc_enc_caps->slice_caps.bits.NUM_SLICES_1 = 1;
+	dsc_enc_caps->slice_caps.bits.NUM_SLICES_2 = 1;
+	dsc_enc_caps->slice_caps.bits.NUM_SLICES_3 = 1;
+	dsc_enc_caps->slice_caps.bits.NUM_SLICES_4 = 1;
+
+	dsc_enc_caps->lb_bit_depth = 13;
+	dsc_enc_caps->is_block_pred_supported = true;
+
+	dsc_enc_caps->color_formats.bits.RGB = 1;
+	dsc_enc_caps->color_formats.bits.YCBCR_444 = 1;
+	dsc_enc_caps->color_formats.bits.YCBCR_SIMPLE_422 = 1;
+	dsc_enc_caps->color_formats.bits.YCBCR_NATIVE_422 = 0;
+	dsc_enc_caps->color_formats.bits.YCBCR_NATIVE_420 = 1;
+
+	dsc_enc_caps->color_depth.bits.COLOR_DEPTH_8_BPC = 1;
+	dsc_enc_caps->color_depth.bits.COLOR_DEPTH_10_BPC = 1;
+	dsc_enc_caps->color_depth.bits.COLOR_DEPTH_12_BPC = 1;
+
+	dsc_enc_caps->max_total_throughput_mps = max_dscclk_khz * 3 / 1000;
+
+	dsc_enc_caps->max_slice_width = 5184; /* (including 64 overlap pixels for eDP MSO mode) */
+	dsc_enc_caps->bpp_increment_div = 16; /* 1/16th of a bit */
 }