drm/amd/display: Block Invalid TMDS operation

Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

kernel os linux

[Why]
When sink type is TMDS, PHY programming does not block against pixel
clock greater than 600MHz.

[How]
Based on sink type, block greater than 600MHz phy programming.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Aric Cyr <aric.cyr@amd.com>
Signed-off-by: Chris Park <chris.park@amd.com>
Signed-off-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

authored by

Chris Park and committed by

Alex Deucher 2 years ago 95265e4b f9dfa31f

2 changed files

expand all

drivers

gpu

drm

amd

display

dce

dce_clock_source.c

link

link_dpms.c

drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c

··· 1105 1105 &dto_params); 1106 1106 1107 1107 } else { 1108 + if (pll_settings->actual_pix_clk_100hz > 6000000UL) 1109 + return false; 1110 + 1108 1111 /* disables DP DTO when provided with TMDS signal type */ 1109 1112 clock_source->ctx->dc->res_pool->dccg->funcs->set_dp_dto( 1110 1113 clock_source->ctx->dc->res_pool->dccg,

drivers/gpu/drm/amd/display/dc/link/link_dpms.c

··· 1953 1953 stream->phy_pix_clk = stream->timing.pix_clk_100hz / 10; 1954 1954 if (stream->phy_pix_clk > 340000) 1955 1955 is_over_340mhz = true; 1956 + if (dc_is_tmds_signal(stream->signal) && stream->phy_pix_clk > 6000000UL) { 1957 + ASSERT(false); 1958 + return; 1959 + } 1956 1960 1957 1961 if (dc_is_hdmi_signal(pipe_ctx->stream->signal)) { 1958 1962 unsigned short masked_chip_caps = pipe_ctx->stream->link->chip_caps &

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