Re: [Intel-gfx] [PATCH] drm/i915: Fix TGL DKL PHY DP vswing handling
From: Souza, Jose <hidden>
Date: 2020-09-30 22:48:14
Also in:
intel-gfx
On Thu, 2020-10-01 at 01:36 +0300, Ville Syrjala wrote:
From: Ville Syrjälä < ville.syrjala@linux.intel.comquoted
The HDMI vs. not-HDMI check got inverted whem the bogus encoder->type checks were eliminated. So now we're using 0 as the link rate on DP and potentially non-zero on HDMI, which is exactly the opposite of what we want. The original bogus check actually worked more correctly by accident since if would always evaluate to true. Due to this we now always use the RBR/HBR1 vswing table and never ever the HBR2+ vswing table. That is probably not a good way to get a high quality signal at HBR2+ rates. Fix the check so we pick the right table.
Reviewed-by: José Roberto de Souza <redacted>
quoted hunk ↗ jump to hunk
Cc: stable@vger.kernel.org Cc: Vandita Kulkarni < vandita.kulkarni@intel.comquoted
Cc: Uma Shankar < uma.shankar@intel.comquoted
Fixes: 94641eb6c696 ("drm/i915/display: Fix the encoder type check") Signed-off-by: Ville Syrjälä < ville.syrjala@linux.intel.comquoted
--- drivers/gpu/drm/i915/display/intel_ddi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c index 4d06178cd76c..cdcb7b1034ae 100644 --- a/drivers/gpu/drm/i915/display/intel_ddi.c +++ b/drivers/gpu/drm/i915/display/intel_ddi.c@@ -2742,7 +2742,7 @@ tgl_dkl_phy_ddi_vswing_sequence(struct intel_encoder *encoder, int link_clock, u32 n_entries, val, ln, dpcnt_mask, dpcnt_val; int rate = 0; - if (type == INTEL_OUTPUT_HDMI) { + if (type != INTEL_OUTPUT_HDMI) { struct intel_dp *intel_dp = enc_to_intel_dp(encoder); rate = intel_dp->link_rate;