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drm/amd/display: check if REFCLK_CNTL register is present

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[ Upstream commit 3159d41db3a04330c31ece32f8b29752fc114848 ]

Check before programming the register since it isn't present on
all IPs using this code.

Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Reviewed-by: Eric Bernstein <Eric.Bernstein@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dmytro Laktyushkin 2020-04-22 18:07:52 -04:00 committed by Greg Kroah-Hartman
parent 65f3108cbb
commit f4164b29dc
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
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@ -2015,7 +2015,8 @@ static void dcn20_fpga_init_hw(struct dc *dc)
REG_UPDATE(DCHUBBUB_GLOBAL_TIMER_CNTL, DCHUBBUB_GLOBAL_TIMER_REFDIV, 2);
REG_UPDATE(DCHUBBUB_GLOBAL_TIMER_CNTL, DCHUBBUB_GLOBAL_TIMER_ENABLE, 1);
REG_WRITE(REFCLK_CNTL, 0);
if (REG(REFCLK_CNTL))
REG_WRITE(REFCLK_CNTL, 0);
//