From: Ville Syrjälä <[email protected]> Prepare for per-lane drive settings by querying the desired vswing level per-lane.
Note that the code only does two loops, with each one writing the levels for two TX lanes. The register offsets also look a bit funny because each time through the loop we write to the exact same register offsets. The crucial bit is the HIP_INDEX_REG write that steers the same mmio window into different places. Signed-off-by: Ville Syrjälä <[email protected]> --- drivers/gpu/drm/i915/display/intel_ddi.c | 33 ++++++++++++++---------- 1 file changed, 19 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c index 1874a2ca8f3b..85247744e9dd 100644 --- a/drivers/gpu/drm/i915/display/intel_ddi.c +++ b/drivers/gpu/drm/i915/display/intel_ddi.c @@ -1295,9 +1295,7 @@ static void tgl_dkl_phy_set_signal_levels(struct intel_encoder *encoder, { struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); enum tc_port tc_port = intel_port_to_tc(dev_priv, encoder->port); - int level = intel_ddi_level(encoder, crtc_state, 0); const struct intel_ddi_buf_trans *trans; - u32 val, dpcnt_mask, dpcnt_val; int n_entries, ln; if (intel_tc_port_in_tbt_alt_mode(enc_to_dig_port(encoder))) @@ -1307,28 +1305,35 @@ static void tgl_dkl_phy_set_signal_levels(struct intel_encoder *encoder, if (drm_WARN_ON_ONCE(&dev_priv->drm, !trans)) return; - dpcnt_mask = (DKL_TX_PRESHOOT_COEFF_MASK | - DKL_TX_DE_EMPAHSIS_COEFF_MASK | - DKL_TX_VSWING_CONTROL_MASK); - dpcnt_val = DKL_TX_VSWING_CONTROL(trans->entries[level].dkl.vswing); - dpcnt_val |= DKL_TX_DE_EMPHASIS_COEFF(trans->entries[level].dkl.de_emphasis); - dpcnt_val |= DKL_TX_PRESHOOT_COEFF(trans->entries[level].dkl.preshoot); - for (ln = 0; ln < 2; ln++) { + int level; + u32 val; + intel_de_write(dev_priv, HIP_INDEX_REG(tc_port), HIP_INDEX_VAL(tc_port, ln)); intel_de_write(dev_priv, DKL_TX_PMD_LANE_SUS(tc_port), 0); - /* All the registers are RMW */ + level = intel_ddi_level(encoder, crtc_state, 2*ln+0); + val = intel_de_read(dev_priv, DKL_TX_DPCNTL0(tc_port)); - val &= ~dpcnt_mask; - val |= dpcnt_val; + val &= ~(DKL_TX_PRESHOOT_COEFF_MASK | + DKL_TX_DE_EMPAHSIS_COEFF_MASK | + DKL_TX_VSWING_CONTROL_MASK); + val |= DKL_TX_VSWING_CONTROL(trans->entries[level].dkl.vswing) | + DKL_TX_DE_EMPHASIS_COEFF(trans->entries[level].dkl.de_emphasis) | + DKL_TX_PRESHOOT_COEFF(trans->entries[level].dkl.preshoot); intel_de_write(dev_priv, DKL_TX_DPCNTL0(tc_port), val); + level = intel_ddi_level(encoder, crtc_state, 2*ln+1); + val = intel_de_read(dev_priv, DKL_TX_DPCNTL1(tc_port)); - val &= ~dpcnt_mask; - val |= dpcnt_val; + val &= ~(DKL_TX_PRESHOOT_COEFF_MASK | + DKL_TX_DE_EMPAHSIS_COEFF_MASK | + DKL_TX_VSWING_CONTROL_MASK); + val |= DKL_TX_VSWING_CONTROL(trans->entries[level].dkl.vswing) | + DKL_TX_DE_EMPHASIS_COEFF(trans->entries[level].dkl.de_emphasis) | + DKL_TX_PRESHOOT_COEFF(trans->entries[level].dkl.preshoot); intel_de_write(dev_priv, DKL_TX_DPCNTL1(tc_port), val); val = intel_de_read(dev_priv, DKL_TX_DPCNTL2(tc_port)); -- 2.32.0
