> -----Original Message----- > From: Sousa, Gustavo <[email protected]> > Sent: Wednesday, July 26, 2023 12:27 AM > To: [email protected] > Cc: Kahola, Mika <[email protected]>; Sripada, Radhakrishna > <[email protected]>; Taylor, Clinton A > <[email protected]> > Subject: [PATCH 4/4] drm/i915/cx0: Program vswing only for owned lanes > > According to the BSpec, voltage swing programming should be done for owned > PHY lanes. Do not program a not-owned PHY > lane. > > BSpec: 74103, 74104
Reviewed-by: Mika Kahola <[email protected]> > Signed-off-by: Gustavo Sousa <[email protected]> > --- > drivers/gpu/drm/i915/display/intel_cx0_phy.c | 25 +++++++++++--------- > 1 file changed, 14 insertions(+), 11 deletions(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.c > b/drivers/gpu/drm/i915/display/intel_cx0_phy.c > index 236124786631..cfb2093feb3b 100644 > --- a/drivers/gpu/drm/i915/display/intel_cx0_phy.c > +++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c > @@ -375,6 +375,7 @@ void intel_cx0_phy_set_signal_levels(struct intel_encoder > *encoder, > struct drm_i915_private *i915 = to_i915(encoder->base.dev); > const struct intel_ddi_buf_trans *trans; > enum phy phy = intel_port_to_phy(i915, encoder->port); > + u8 owned_lane_mask = intel_cx0_get_owned_lane_mask(i915, encoder); > intel_wakeref_t wakeref; > int n_entries, ln; > > @@ -387,13 +388,13 @@ void intel_cx0_phy_set_signal_levels(struct > intel_encoder *encoder, > } > > if (intel_is_c10phy(i915, phy)) { > - intel_cx0_rmw(i915, encoder->port, INTEL_CX0_BOTH_LANES, > PHY_C10_VDR_CONTROL(1), > + intel_cx0_rmw(i915, encoder->port, owned_lane_mask, > +PHY_C10_VDR_CONTROL(1), > 0, C10_VDR_CTRL_MSGBUS_ACCESS, > MB_WRITE_COMMITTED); > - intel_cx0_rmw(i915, encoder->port, INTEL_CX0_BOTH_LANES, > PHY_C10_VDR_CMN(3), > + intel_cx0_rmw(i915, encoder->port, owned_lane_mask, > +PHY_C10_VDR_CMN(3), > C10_CMN3_TXVBOOST_MASK, > > C10_CMN3_TXVBOOST(intel_c10_get_tx_vboost_lvl(crtc_state)), > MB_WRITE_UNCOMMITTED); > - intel_cx0_rmw(i915, encoder->port, INTEL_CX0_BOTH_LANES, > PHY_C10_VDR_TX(1), > + intel_cx0_rmw(i915, encoder->port, owned_lane_mask, > +PHY_C10_VDR_TX(1), > C10_TX1_TERMCTL_MASK, > > C10_TX1_TERMCTL(intel_c10_get_tx_term_ctl(crtc_state)), > MB_WRITE_COMMITTED); > @@ -401,32 +402,34 @@ void intel_cx0_phy_set_signal_levels(struct > intel_encoder *encoder, > > for (ln = 0; ln < crtc_state->lane_count; ln++) { > int level = intel_ddi_level(encoder, crtc_state, ln); > - int lane, tx; > + int lane = ln / 2; > + int tx = ln % 2; > + u8 lane_mask = lane == 0 ? INTEL_CX0_LANE0 : INTEL_CX0_LANE1; > > - lane = ln / 2; > - tx = ln % 2; > + if (!(lane_mask & owned_lane_mask)) > + continue; > > - intel_cx0_rmw(i915, encoder->port, BIT(lane), > PHY_CX0_VDROVRD_CTL(lane, tx, 0), > + intel_cx0_rmw(i915, encoder->port, lane_mask, > +PHY_CX0_VDROVRD_CTL(lane, tx, 0), > C10_PHY_OVRD_LEVEL_MASK, > > C10_PHY_OVRD_LEVEL(trans->entries[level].snps.pre_cursor), > MB_WRITE_COMMITTED); > - intel_cx0_rmw(i915, encoder->port, BIT(lane), > PHY_CX0_VDROVRD_CTL(lane, tx, 1), > + intel_cx0_rmw(i915, encoder->port, lane_mask, > +PHY_CX0_VDROVRD_CTL(lane, tx, 1), > C10_PHY_OVRD_LEVEL_MASK, > > C10_PHY_OVRD_LEVEL(trans->entries[level].snps.vswing), > MB_WRITE_COMMITTED); > - intel_cx0_rmw(i915, encoder->port, BIT(lane), > PHY_CX0_VDROVRD_CTL(lane, tx, 2), > + intel_cx0_rmw(i915, encoder->port, lane_mask, > +PHY_CX0_VDROVRD_CTL(lane, tx, 2), > C10_PHY_OVRD_LEVEL_MASK, > > C10_PHY_OVRD_LEVEL(trans->entries[level].snps.post_cursor), > MB_WRITE_COMMITTED); > } > > /* Write Override enables in 0xD71 */ > - intel_cx0_rmw(i915, encoder->port, INTEL_CX0_BOTH_LANES, > PHY_C10_VDR_OVRD, > + intel_cx0_rmw(i915, encoder->port, owned_lane_mask, PHY_C10_VDR_OVRD, > 0, PHY_C10_VDR_OVRD_TX1 | PHY_C10_VDR_OVRD_TX2, > MB_WRITE_COMMITTED); > > if (intel_is_c10phy(i915, phy)) > - intel_cx0_rmw(i915, encoder->port, INTEL_CX0_BOTH_LANES, > PHY_C10_VDR_CONTROL(1), > + intel_cx0_rmw(i915, encoder->port, owned_lane_mask, > +PHY_C10_VDR_CONTROL(1), > 0, C10_VDR_CTRL_UPDATE_CFG, MB_WRITE_COMMITTED); > > intel_cx0_phy_transaction_end(encoder, wakeref); > -- > 2.41.0
