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drm/amd/display: Initialize DSC PPS variables to 0 

[ Upstream commit b6adc57cff ]

For DSC MST, sometimes monitors would break out
in full-screen static. The issue traced back to the
PPS generation code, where these variables were being used
uninitialized and were picking up garbage.

memset to 0 to avoid this

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: David Francis <David.Francis@amd.com>
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
David Francis 2019-08-16 13:43:46 -04:00 committed by Greg Kroah-Hartman
parent 65f2f19252
commit 1e4a6a0e03
2 changed files with 6 additions and 0 deletions
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3
drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
View File

@ -496,6 +496,9 @@ bool dp_set_dsc_pps_sdp(struct pipe_ctx *pipe_ctx, bool enable)
struct dsc_config dsc_cfg;
uint8_t dsc_packed_pps[128];
memset(&dsc_cfg, 0, sizeof(dsc_cfg));
memset(dsc_packed_pps, 0, 128);
/* Enable DSC hw block */
dsc_cfg.pic_width = stream->timing.h_addressable + stream->timing.h_border_left + stream->timing.h_border_right;
dsc_cfg.pic_height = stream->timing.v_addressable + stream->timing.v_border_top + stream->timing.v_border_bottom;

3
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dsc.c
View File

@ -207,6 +207,9 @@ static bool dsc2_get_packed_pps(struct display_stream_compressor *dsc, const str
struct dsc_reg_values dsc_reg_vals;
struct dsc_optc_config dsc_optc_cfg;
memset(&dsc_reg_vals, 0, sizeof(dsc_reg_vals));
memset(&dsc_optc_cfg, 0, sizeof(dsc_optc_cfg));
DC_LOG_DSC("Getting packed DSC PPS for DSC Config:");
dsc_config_log(dsc, dsc_cfg);
DC_LOG_DSC("DSC Picture Parameter Set (PPS):");