On Thu, Apr 06, 2023 at 04:02:20PM +0300, Mika Kahola wrote:
> From: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
>
> MTL requires the PORT_CTL_WIDTH, TRANS_DDI_FUNC_CTL and DDI_BUF_CTL
> to be filled with 4 lanes for TMDS mode.
> This patch enables D2D link and fills PORT_WIDTH in appropriate
> registers.
>
> v2:
> - Added fixes from Clint's Add HDMI implementation changes.
> - Modified commit message.
> v3:
> - Use TRANS_DDI_PORT_WIDTH() instead of DDI_PORT_WIDTH() for the value
> of TRANS_DDI_FUNC_CTL_*. (Gustavo)
>
> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
> Signed-off-by: Taylor, Clinton A <clinton.a.taylor@xxxxxxxxx>
> Signed-off-by: Mika Kahola <mika.kahola@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_ddi.c | 48 +++++++++++++++++++++---
> drivers/gpu/drm/i915/i915_reg.h | 2 +
> 2 files changed, 44 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index e97d7627d9d1..20b0844b8240 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -516,6 +516,8 @@ intel_ddi_transcoder_func_reg_val_get(struct intel_encoder *encoder,
> temp |= TRANS_DDI_HDMI_SCRAMBLING;
> if (crtc_state->hdmi_high_tmds_clock_ratio)
> temp |= TRANS_DDI_HIGH_TMDS_CHAR_RATE;
> + if (DISPLAY_VER(dev_priv) >= 14)
> + temp |= TRANS_DDI_PORT_WIDTH(crtc_state->lane_count);
> } else if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_ANALOG)) {
> temp |= TRANS_DDI_MODE_SELECT_FDI_OR_128B132B;
> temp |= (crtc_state->fdi_lanes - 1) << 1;
> @@ -2891,6 +2893,10 @@ static void intel_enable_ddi_hdmi(struct intel_atomic_state *state,
> if (has_buf_trans_select(dev_priv))
> hsw_prepare_hdmi_ddi_buffers(encoder, crtc_state);
>
> + /* e. Enable D2D Link for C10/C20 Phy */
> + if (DISPLAY_VER(dev_priv) >= 14)
> + mtl_ddi_enable_d2d(encoder);
> +
> encoder->set_signal_levels(encoder, crtc_state);
>
> /* Display WA #1143: skl,kbl,cfl */
> @@ -2936,13 +2942,39 @@ static void intel_enable_ddi_hdmi(struct intel_atomic_state *state,
> *
> * On ADL_P the PHY link rate and lane count must be programmed but
> * these are both 0 for HDMI.
> + *
> + * But MTL onwards HDMI2.1 is supported and in TMDS mode this
> + * is always filled with 4 lanes, already set in the crtc_state.
Looks like HDMI FRL mode can be configured to 3 lanes as well.
> + * 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;
I'd keep the above here which is valid on all platforms.
> - 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;
> + if (DISPLAY_VER(dev_priv) >= 14) {
> + u32 ddi_buf = 0;
> + u8 lane_count = mtl_get_port_width(crtc_state->lane_count);
mtl_get_port_width() is defined only in the next patch, but would be
better to have XELPDP_PORT_WIDTH() do the conversion instead similarly
to TRANS_DDI_PORT_WIDTH().
> + u32 port_buf = 0;
> +
> + port_buf |= XELPDP_PORT_WIDTH(lane_count);
> +
> + if (intel_bios_is_lane_reversal_needed(dev_priv, port))
> + port_buf |= XELPDP_PORT_REVERSAL;
> +
> + intel_de_rmw(dev_priv, XELPDP_PORT_BUF_CTL1(port), 0, port_buf);
The above needs the actual mask to clear the fields before setting them.
> +
> + ddi_buf |= DDI_BUF_CTL_ENABLE |
> + DDI_PORT_WIDTH(lane_count);
> +
> + intel_de_write(dev_priv, DDI_BUF_CTL(port),
> + dig_port->saved_port_bits | ddi_buf);
DDI_BUF_CTL_ENABLE and saved_port_bits should be set for all platforms
before the if-ladder and the write should happen at one place after the
if-ladder.
> +
> + /* i. Poll for PORT_BUF_CTL Idle Status == 0, timeout after 100 us */
> + intel_wait_ddi_buf_active(dev_priv, port);
The above is called now twice, can be removed from here.
> + } else {
> + buf_ctl = dig_port->saved_port_bits | DDI_BUF_CTL_ENABLE;
> + 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;
> + }
> + intel_de_write(dev_priv, DDI_BUF_CTL(port), buf_ctl);
> }
> - intel_de_write(dev_priv, DDI_BUF_CTL(port), buf_ctl);
>
> intel_wait_ddi_buf_active(dev_priv, port);
>
> @@ -3357,7 +3389,11 @@ static void intel_ddi_read_func_ctl(struct intel_encoder *encoder,
> fallthrough;
> case TRANS_DDI_MODE_SELECT_DVI:
> pipe_config->output_types |= BIT(INTEL_OUTPUT_HDMI);
> - pipe_config->lane_count = 4;
> + if (DISPLAY_VER(dev_priv) >= 14)
> + pipe_config->lane_count =
> + ((temp & DDI_PORT_WIDTH_MASK) >> DDI_PORT_WIDTH_SHIFT) + 1;
> + else
> + pipe_config->lane_count = 4;
> break;
> case TRANS_DDI_MODE_SELECT_DP_SST:
> if (encoder->type == INTEL_OUTPUT_EDP)
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 8d49676148f2..c4d363248bd2 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5597,6 +5597,8 @@ enum skl_power_gate {
> #define TRANS_DDI_HDCP_SELECT REG_BIT(5)
> #define TRANS_DDI_BFI_ENABLE (1 << 4)
> #define TRANS_DDI_HIGH_TMDS_CHAR_RATE (1 << 4)
> +#define TRANS_DDI_PORT_WIDTH_MASK REG_GENMASK(3, 1)
> +#define TRANS_DDI_PORT_WIDTH(width) REG_FIELD_PREP(TRANS_DDI_PORT_WIDTH_MASK, (width) - 1)
> #define TRANS_DDI_HDMI_SCRAMBLING (1 << 0)
> #define TRANS_DDI_HDMI_SCRAMBLING_MASK (TRANS_DDI_HDMI_SCRAMBLER_CTS_ENABLE \
> | TRANS_DDI_HDMI_SCRAMBLER_RESET_FREQ \
> --
> 2.34.1
>
