drm/i915/audio: Consider fractional vdsc bpp while computing tu_data

MTL+ supports fractional compressed bits_per_pixel, with precision of
1/16. This compressed bpp is stored in U6.4 format.
Accommodate the precision during calculation of transfer unit data
for hblank_early calculation.

v2:
-Fix tu_data calculation while dealing with U6.4 format. (Stan)

v3:
-Use BPP_X16_FMT to print vdsc bpp.
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Sui Jingfeng <suijingfeng@loongson.cn>
Link: https://patchwork.freedesktop.org/patch/msgid/20231110101020.4067342-5-ankit.k.nautiyal@intel.com

drivers/gpu/drm/i915/display/intel_audio.c

@@ -521,25 +521,25 @@ static unsigned int calc_hblank_early_prog(struct intel_encoder *encoder,
 	unsigned int link_clks_available, link_clks_required;
 	unsigned int tu_data, tu_line, link_clks_active;
 	unsigned int h_active, h_total, hblank_delta, pixel_clk;
-	unsigned int fec_coeff, cdclk, vdsc_bpp;
+	unsigned int fec_coeff, cdclk, vdsc_bppx16;
 	unsigned int link_clk, lanes;
 	unsigned int hblank_rise;
 
 	h_active = crtc_state->hw.adjusted_mode.crtc_hdisplay;
 	h_total = crtc_state->hw.adjusted_mode.crtc_htotal;
 	pixel_clk = crtc_state->hw.adjusted_mode.crtc_clock;
-	vdsc_bpp = to_bpp_int(crtc_state->dsc.compressed_bpp_x16);
+	vdsc_bppx16 = crtc_state->dsc.compressed_bpp_x16;
 	cdclk = i915->display.cdclk.hw.cdclk;
 	/* fec= 0.972261, using rounding multiplier of 1000000 */
 	fec_coeff = 972261;
 	link_clk = crtc_state->port_clock;
 	lanes = crtc_state->lane_count;
 
-	drm_dbg_kms(&i915->drm, "h_active = %u link_clk = %u :"
-		    "lanes = %u vdsc_bpp = %u cdclk = %u\n",
-		    h_active, link_clk, lanes, vdsc_bpp, cdclk);
+	drm_dbg_kms(&i915->drm,
+		    "h_active = %u link_clk = %u : lanes = %u vdsc_bpp = " BPP_X16_FMT " cdclk = %u\n",
+		    h_active, link_clk, lanes, BPP_X16_ARGS(vdsc_bppx16), cdclk);
 
-	if (WARN_ON(!link_clk || !pixel_clk || !lanes || !vdsc_bpp || !cdclk))
+	if (WARN_ON(!link_clk || !pixel_clk || !lanes || !vdsc_bppx16 || !cdclk))
 		return 0;
 
 	link_clks_available = (h_total - h_active) * link_clk / pixel_clk - 28;
@@ -551,8 +551,8 @@ static unsigned int calc_hblank_early_prog(struct intel_encoder *encoder,
 		hblank_delta = DIV64_U64_ROUND_UP(mul_u32_u32(5 * (link_clk + cdclk), pixel_clk),
 						  mul_u32_u32(link_clk, cdclk));
 
-	tu_data = div64_u64(mul_u32_u32(pixel_clk * vdsc_bpp * 8, 1000000),
-			    mul_u32_u32(link_clk * lanes, fec_coeff));
+	tu_data = div64_u64(mul_u32_u32(pixel_clk * vdsc_bppx16 * 8, 1000000),
+			    mul_u32_u32(link_clk * lanes * 16, fec_coeff));
 	tu_line = div64_u64(h_active * mul_u32_u32(link_clk, fec_coeff),
 			    mul_u32_u32(64 * pixel_clk, 1000000));
 	link_clks_active  = (tu_line - 1) * 64 + tu_data;