drm/amd/display: update clk for various HDMI color depths (81aca8e7) · Commits · e / devices / android_kernel_fairphone_FP4

[why] When programming tonga's connector's backend we didn't take in account that HDMI's colour depth might be more than 8bpc therefore we need to add a switch statement that would adjust the pixel clock accordingly. [how] Add a switch statement updating clock by its appropriate coefficient. Signed-off-by:

Mikita Lipski <mikita.lipski@amd.com> Reviewed-by:

Charlene Liu <Charlene.Liu@amd.com> Acked-by:

Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Signed-off-by:

Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org

drivers/gpu/drm/amd/display/dc/bios/command_table.c

+18 −0

Original line number	Diff line number	Diff line
		@@ -808,6 +808,24 @@ static enum bp_result transmitter_control_v1_5(
		* (=1: 8bpp, =1.25: 10bpp, =1.5:12bpp, =2: 16bpp)
		* LVDS mode: usPixelClock = pixel clock
		*/
		if (cntl->signal == SIGNAL_TYPE_HDMI_TYPE_A) {
		switch (cntl->color_depth) {
		case COLOR_DEPTH_101010:
		params.usSymClock =
		cpu_to_le16((le16_to_cpu(params.usSymClock) * 30) / 24);
		break;
		case COLOR_DEPTH_121212:
		params.usSymClock =
		cpu_to_le16((le16_to_cpu(params.usSymClock) * 36) / 24);
		break;
		case COLOR_DEPTH_161616:
		params.usSymClock =
		cpu_to_le16((le16_to_cpu(params.usSymClock) * 48) / 24);
		break;
		default:
		break;
		}
		}

		if (EXEC_BIOS_CMD_TABLE(UNIPHYTransmitterControl, params))
		result = BP_RESULT_OK;