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drm/amd/display: update clk for various HDMI color depths

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commit 81aca8e75c1b046865fb2badef95a0dcff6f73de upstream.

[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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mikita Lipski 2018-07-13 09:07:35 -04:00 committed by Greg Kroah-Hartman
parent b31d6596d7
commit 691f2d763d
1 changed files with 18 additions and 0 deletions
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18
drivers/gpu/drm/amd/display/dc/bios/command_table.c
View File

@ -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;