From ab796810df23c4c0b68db0b462b6609977b024fe Mon Sep 17 00:00:00 2001 From: Nevenko Stupar Date: Thu, 27 Aug 2026 15:56:41 -0400 Subject: [PATCH] drm/amd/display: Fix DC Hub reference frequency assert range [Why & How] The DC Hub reference frequency valid range was asserted incorrectly. Correct the range to 20 to 50 MHz and update the comment accordingly. Reviewed-by: Sridevi Arvindekar Reviewed-by: Dillon Varone Signed-off-by: Nevenko Stupar Signed-off-by: Ray Wu Tested-by: Dan Wheeler Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/hubbub/dcn20/dcn20_hubbub.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/hubbub/dcn20/dcn20_hubbub.c b/drivers/gpu/drm/amd/display/dc/hubbub/dcn20/dcn20_hubbub.c index 053a08b6d3a3..9fb2907361c3 100644 --- a/drivers/gpu/drm/amd/display/dc/hubbub/dcn20/dcn20_hubbub.c +++ b/drivers/gpu/drm/amd/display/dc/hubbub/dcn20/dcn20_hubbub.c @@ -574,9 +574,8 @@ void hubbub2_get_dchub_ref_freq(struct hubbub *hubbub, else *dchub_ref_freq_inKhz = dccg_ref_freq_inKhz; - // DC hub reference frequency must be around 50Mhz, otherwise there may be - // overflow/underflow issues when doing HUBBUB programming - if (*dchub_ref_freq_inKhz < 40000 || *dchub_ref_freq_inKhz > 60000) + // DC Hub reference frequency valid range is 20 to 50 MHz + if (*dchub_ref_freq_inKhz < 20000 || *dchub_ref_freq_inKhz > 50000) ASSERT_CRITICAL(false); return;