> -----Original Message-----
> From: Sousa, Gustavo <gustavo.so...@intel.com>
> Sent: Wednesday, July 26, 2023 12:27 AM
> To: intel-gfx@lists.freedesktop.org
> Cc: Kahola, Mika <mika.kah...@intel.com>; Sripada, Radhakrishna
> <radhakrishna.srip...@intel.com>; Taylor, Clinton A
> <clinton.a.tay...@intel.com>
> Subject: [PATCH 3/4] drm/i915/cx0: Enable/disable TX only for owned PHY lanes
>
> Display must not enable or disable transmitters for not-owned PHY lanes.
>
> BSpec: 64539
Reviewed-by: Mika Kahola <mika.kah...@intel.com>
> Signed-off-by: Gustavo Sousa <gustavo.so...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_cx0_phy.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.c
> b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
> index f10ebdfd696a..236124786631 100644
> --- a/drivers/gpu/drm/i915/display/intel_cx0_phy.c
> +++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
> @@ -2607,10 +2607,11 @@ static void intel_cx0_program_phy_lane(struct
> drm_i915_private *i915,
> int i;
> u8 disables;
> bool dp_alt_mode =
> intel_tc_port_in_dp_alt_mode(enc_to_dig_port(encoder));
> + u8 owned_lane_mask = intel_cx0_get_owned_lane_mask(i915, encoder);
> enum port port = encoder->port;
>
> if (intel_is_c10phy(i915, intel_port_to_phy(i915, port)))
> - intel_cx0_rmw(i915, port, INTEL_CX0_BOTH_LANES,
> + intel_cx0_rmw(i915, port, owned_lane_mask,
> PHY_C10_VDR_CONTROL(1), 0,
> C10_VDR_CTRL_MSGBUS_ACCESS,
> MB_WRITE_COMMITTED);
> @@ -2625,11 +2626,13 @@ static void intel_cx0_program_phy_lane(struct
> drm_i915_private *i915,
> disables |= REG_FIELD_PREP8(REG_GENMASK8(1, 0), 0x1);
> }
>
> - /* TODO: DP-alt MFD case where only one PHY lane should be programmed.
> */
> for (i = 0; i < 4; i++) {
> int tx = i % 2 + 1;
> u8 lane_mask = i / 2 == 0 ? INTEL_CX0_LANE0 : INTEL_CX0_LANE1;
>
> + if (!(owned_lane_mask & lane_mask))
> + continue;
> +
> intel_cx0_rmw(i915, port, lane_mask, PHY_CX0_TX_CONTROL(tx, 2),
> CONTROL2_DISABLE_SINGLE_TX,
> disables & BIT(i) ? CONTROL2_DISABLE_SINGLE_TX :
> 0, @@ -2637,7 +2640,7 @@ static void
> intel_cx0_program_phy_lane(struct drm_i915_private *i915,
> }
>
> if (intel_is_c10phy(i915, intel_port_to_phy(i915, port)))
> - intel_cx0_rmw(i915, port, INTEL_CX0_BOTH_LANES,
> + intel_cx0_rmw(i915, port, owned_lane_mask,
> PHY_C10_VDR_CONTROL(1), 0,
> C10_VDR_CTRL_UPDATE_CFG,
> MB_WRITE_COMMITTED);
> --
> 2.41.0
