[Intel-gfx] [PATCH v3 09/13] drm/i915/dg2: configure TRANS_DP2_CTL for DP 2.0

Jani Nikula
2021-09-09T12:53:27Z

Set the DP 2.0 128b/132b channel encoding for UHBR rates.

v2: Fix UHBR port clock check, use intel_dp_is_uhbr()

Bspec: 54128
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com> # v1
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
drivers/gpu/drm/i915/display/intel_ddi.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 2361f48537b5..a7b7e4fafcb3 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -408,6 +408,20 @@ static u32 bdw_trans_port_sync_master_select(enum transcoder master_transcoder)
return master_transcoder + 1;
}

+static void
+intel_ddi_config_transcoder_dp2(struct intel_encoder *encoder,
+ const struct intel_crtc_state *crtc_state)
+{
+ struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+ enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
+ u32 val = 0;
+
+ if (intel_dp_is_uhbr(crtc_state))
+ val = TRANS_DP2_128B132B_CHANNEL_CODING;
+
+ intel_de_write(i915, TRANS_DP2_CTL(cpu_transcoder), val);
+}
+
/*
* Returns the TRANS_DDI_FUNC_CTL value based on CRTC state.
*
@@ -2376,7 +2390,8 @@ static void dg2_ddi_pre_enable_dp(struct intel_atomic_state *state,
*/
intel_ddi_enable_pipe_clock(encoder, crtc_state);

- /* 5.b Not relevant to i915 for now */
+ /* 5.b Configure transcoder for DP 2.0 128b/132b */
+ intel_ddi_config_transcoder_dp2(encoder, crtc_state);

/*
* 5.c Configure TRANS_DDI_FUNC_CTL DDI Select, DDI Mode Select & MST
--
2.30.2