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drm/amd/display: fix integer overflow during MSA V_Freq calculation

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[why]
Analyzer shows incorrect V freq in MSA for some large timing.

[how]
Cast an 32 bit integer to uint64_t before multiplication to avoid
integer overflow for a very large timing.

Reviewed-by: Ariel Bernstein <Eric.Bernstein@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Wenjing Liu 2022-09-22 14:22:04 -04:00 committed by Alex Deucher
parent 40169e2f37
commit 283e0a673c
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hpo_dp_stream_encoder.c
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@ -197,7 +197,7 @@ static void dcn31_hpo_dp_stream_enc_set_stream_attribute(
uint32_t h_back_porch;
uint32_t h_width;
uint32_t v_height;
unsigned long long v_freq;
uint64_t v_freq;
uint8_t misc0 = 0;
uint8_t misc1 = 0;
uint8_t hsp;
@ -360,7 +360,7 @@ static void dcn31_hpo_dp_stream_enc_set_stream_attribute(
v_height = hw_crtc_timing.v_border_top + hw_crtc_timing.v_addressable + hw_crtc_timing.v_border_bottom;
hsp = hw_crtc_timing.flags.HSYNC_POSITIVE_POLARITY ? 0 : 0x80;
vsp = hw_crtc_timing.flags.VSYNC_POSITIVE_POLARITY ? 0 : 0x80;
v_freq = hw_crtc_timing.pix_clk_100hz * 100;
v_freq = (uint64_t)hw_crtc_timing.pix_clk_100hz * 100;
/* MSA Packet Mapping to 32-bit Link Symbols - DP2 spec, section 2.7.4.1
*