[Intel-xe] [PATCH v3 08/29] drm/i915/display: Consolidate saved port bits in intel_digital_port
Lucas De Marchi
lucas.demarchi at intel.com
Tue Sep 12 17:33:05 UTC 2023
On Mon, Sep 11, 2023 at 09:48:16PM -0700, Lucas De Marchi wrote:
>From: Clint Taylor <clinton.a.taylor at intel.com>
>
>We use multiple variables for HDMI and DisplayPort to store the value of
>DDI_BUF_CTL register (now called DDI_CTL_DE in the spec). Consolidate it
>to just one in struct intel_digital_port. This is a preparation step for
>future changes in D2D enable/disable sequence for xe2lpd that need to
>save some additional bits.
>
>Cc: Anusha Srivatsa <anusha.srivatsa at intel.com>
>Cc: Gustavo Sousa <gustavo.sousa at intel.com>
>Cc: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
>Signed-off-by: Clint Taylor <clinton.a.taylor at intel.com>
>Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
>---
> drivers/gpu/drm/i915/display/intel_ddi.c | 36 +++++++++++-------------
> drivers/gpu/drm/i915/display/intel_dp.c | 2 +-
> 2 files changed, 18 insertions(+), 20 deletions(-)
>
>diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
>index 690e1e02aba8..75a2da5d0c9e 100644
>--- a/drivers/gpu/drm/i915/display/intel_ddi.c
>+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
>@@ -325,26 +325,25 @@ static void intel_ddi_init_dp_buf_reg(struct intel_encoder *encoder,
> const struct intel_crtc_state *crtc_state)
> {
> struct drm_i915_private *i915 = to_i915(encoder->base.dev);
>- struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
> enum phy phy = intel_port_to_phy(i915, encoder->port);
>
> /* DDI_BUF_CTL_ENABLE will be set by intel_ddi_prepare_link_retrain() later */
>- intel_dp->DP = dig_port->saved_port_bits |
>+ dig_port->saved_port_bits |=
One thing we need to do better here: it's going to be error prone to
leave DP as is. I think we need to document that in the case of recent
platforms using ddi, the saved bits are stored in dig_port. And then
maybe rename DP to e.g. saved_reg_bits.
I think this would avoid old patches being applied changing DP and then
having its changes silently ignored. I would also be a better
description of what this variable actually is.
Lucas De Marchi
> DDI_PORT_WIDTH(crtc_state->lane_count) |
> DDI_BUF_TRANS_SELECT(0);
>
> if (DISPLAY_VER(i915) >= 14) {
> if (intel_dp_is_uhbr(crtc_state))
>- intel_dp->DP |= DDI_BUF_PORT_DATA_40BIT;
>+ dig_port->saved_port_bits |= DDI_BUF_PORT_DATA_40BIT;
> else
>- intel_dp->DP |= DDI_BUF_PORT_DATA_10BIT;
>+ dig_port->saved_port_bits |= DDI_BUF_PORT_DATA_10BIT;
> }
>
> if (IS_ALDERLAKE_P(i915) && intel_phy_is_tc(i915, phy)) {
>- intel_dp->DP |= ddi_buf_phy_link_rate(crtc_state->port_clock);
>+ dig_port->saved_port_bits |= ddi_buf_phy_link_rate(crtc_state->port_clock);
> if (!intel_tc_port_in_tbt_alt_mode(dig_port))
>- intel_dp->DP |= DDI_BUF_CTL_TC_PHY_OWNERSHIP;
>+ dig_port->saved_port_bits |= DDI_BUF_CTL_TC_PHY_OWNERSHIP;
> }
> }
>
>@@ -1450,7 +1449,7 @@ hsw_set_signal_levels(struct intel_encoder *encoder,
> const struct intel_crtc_state *crtc_state)
> {
> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
>- struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
>+ struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
> int level = intel_ddi_level(encoder, crtc_state, 0);
> enum port port = encoder->port;
> u32 signal_levels;
>@@ -1467,10 +1466,10 @@ hsw_set_signal_levels(struct intel_encoder *encoder,
> drm_dbg_kms(&dev_priv->drm, "Using signal levels %08x\n",
> signal_levels);
>
>- intel_dp->DP &= ~DDI_BUF_EMP_MASK;
>- intel_dp->DP |= signal_levels;
>+ dig_port->saved_port_bits &= ~DDI_BUF_EMP_MASK;
>+ dig_port->saved_port_bits |= signal_levels;
>
>- intel_de_write(dev_priv, DDI_BUF_CTL(port), intel_dp->DP);
>+ intel_de_write(dev_priv, DDI_BUF_CTL(port), dig_port->saved_port_bits);
> intel_de_posting_read(dev_priv, DDI_BUF_CTL(port));
> }
>
>@@ -3145,7 +3144,6 @@ static void intel_enable_ddi_hdmi(struct intel_atomic_state *state,
> struct drm_connector *connector = conn_state->connector;
> enum port port = encoder->port;
> enum phy phy = intel_port_to_phy(dev_priv, port);
>- u32 buf_ctl;
>
> if (!intel_hdmi_handle_sink_scrambling(encoder, connector,
> crtc_state->hdmi_high_tmds_clock_ratio,
>@@ -3211,7 +3209,7 @@ static void intel_enable_ddi_hdmi(struct intel_atomic_state *state,
> * is filled with lane count, already set in the crtc_state.
> * The same is required to be filled in PORT_BUF_CTL for C10/20 Phy.
> */
>- buf_ctl = dig_port->saved_port_bits | DDI_BUF_CTL_ENABLE;
>+ dig_port->saved_port_bits |= DDI_BUF_CTL_ENABLE;
> if (DISPLAY_VER(dev_priv) >= 14) {
> u8 lane_count = mtl_get_port_width(crtc_state->lane_count);
> u32 port_buf = 0;
>@@ -3224,13 +3222,13 @@ static void intel_enable_ddi_hdmi(struct intel_atomic_state *state,
> intel_de_rmw(dev_priv, XELPDP_PORT_BUF_CTL1(port),
> XELPDP_PORT_WIDTH_MASK | XELPDP_PORT_REVERSAL, port_buf);
>
>- buf_ctl |= DDI_PORT_WIDTH(lane_count);
>+ dig_port->saved_port_bits |= DDI_PORT_WIDTH(lane_count);
> } else if (IS_ALDERLAKE_P(dev_priv) && intel_phy_is_tc(dev_priv, phy)) {
> drm_WARN_ON(&dev_priv->drm, !intel_tc_port_in_legacy_mode(dig_port));
>- buf_ctl |= DDI_BUF_CTL_TC_PHY_OWNERSHIP;
>+ dig_port->saved_port_bits |= DDI_BUF_CTL_TC_PHY_OWNERSHIP;
> }
>
>- intel_de_write(dev_priv, DDI_BUF_CTL(port), buf_ctl);
>+ intel_de_write(dev_priv, DDI_BUF_CTL(port), dig_port->saved_port_bits);
>
> intel_wait_ddi_buf_active(dev_priv, port);
>
>@@ -3448,8 +3446,8 @@ static void mtl_ddi_prepare_link_retrain(struct intel_dp *intel_dp,
> mtl_port_buf_ctl_program(encoder, crtc_state);
>
> /* 6.i Configure and enable DDI_CTL_DE to start sending valid data to port slice */
>- intel_dp->DP |= DDI_BUF_CTL_ENABLE;
>- intel_de_write(dev_priv, DDI_BUF_CTL(port), intel_dp->DP);
>+ dig_port->saved_port_bits |= DDI_BUF_CTL_ENABLE;
>+ intel_de_write(dev_priv, DDI_BUF_CTL(port), dig_port->saved_port_bits);
> intel_de_posting_read(dev_priv, DDI_BUF_CTL(port));
>
> /* 6.j Poll for PORT_BUF_CTL Idle Status == 0, timeout after 100 us */
>@@ -3499,8 +3497,8 @@ static void intel_ddi_prepare_link_retrain(struct intel_dp *intel_dp,
> (intel_tc_port_in_dp_alt_mode(dig_port) || intel_tc_port_in_legacy_mode(dig_port)))
> adlp_tbt_to_dp_alt_switch_wa(encoder);
>
>- intel_dp->DP |= DDI_BUF_CTL_ENABLE;
>- intel_de_write(dev_priv, DDI_BUF_CTL(port), intel_dp->DP);
>+ dig_port->saved_port_bits |= DDI_BUF_CTL_ENABLE;
>+ intel_de_write(dev_priv, DDI_BUF_CTL(port), dig_port->saved_port_bits);
> intel_de_posting_read(dev_priv, DDI_BUF_CTL(port));
>
> intel_wait_ddi_buf_active(dev_priv, port);
>diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
>index 2206b45bc78c..fdf71185cb00 100644
>--- a/drivers/gpu/drm/i915/display/intel_dp.c
>+++ b/drivers/gpu/drm/i915/display/intel_dp.c
>@@ -6017,7 +6017,7 @@ intel_dp_init_connector(struct intel_digital_port *dig_port,
> intel_dp->pps.active_pipe = INVALID_PIPE;
>
> /* Preserve the current hw state. */
>- intel_dp->DP = intel_de_read(dev_priv, intel_dp->output_reg);
>+ dig_port->saved_port_bits = intel_de_read(dev_priv, intel_dp->output_reg);
> intel_dp->attached_connector = intel_connector;
>
> if (_intel_dp_is_port_edp(dev_priv, intel_encoder->devdata, port)) {
>--
>2.40.1
>
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