[PATCH v3] drm/i915/cx0: Set power state to ready only on owned PHY lanes
Gustavo Sousa
gustavo.sousa at intel.com
Tue Sep 17 19:34:32 UTC 2024
Quoting Vamsi Krishna Brahmajosyula (2024-09-17 09:44:49-03:00)
>In DP alt mode, when pin assignment is D, only one PHY lane is owned
>by the display. intel_cx0pll_enable currently performs a power state
>ready on both the lanes in all cases.
>
>Address the todo to perfom power state ready on owned lanes.
>
>Tested on Meteor Lake-P [Intel Arc Graphics] with DP alt mode.
>
>v2 -> v3:
>- Fix changelog per Jani Nikula's feedback
>v1 -> v2: Address Gustavo Sousa's feedback
>- Use owned lanes mask to set Phy power state to Ready, instead of
> maxpclk_lane with DP alt mode check.
>- Owned lanes are obtained from intel_cx0_get_owned_lane_mask().
>
>Signed-off-by: Vamsi Krishna Brahmajosyula <vamsikrishna.brahmajosyula at gmail.com>
Reviewed-by: Gustavo Sousa <gustavo.sousa at intel.com>
For some reason this is not showing up on Patchwork[1].
[1]: https://patchwork.freedesktop.org/project/intel-gfx/series/
--
Gustavo Sousa
>---
> drivers/gpu/drm/i915/display/intel_cx0_phy.c | 6 +++---
> 1 file changed, 3 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 4a6c3040ca15..cbed53d3b250 100644
>--- a/drivers/gpu/drm/i915/display/intel_cx0_phy.c
>+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
>@@ -2934,6 +2934,7 @@ static void intel_cx0pll_enable(struct intel_encoder *encoder,
> enum phy phy = intel_encoder_to_phy(encoder);
> struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
> bool lane_reversal = dig_port->saved_port_bits & DDI_BUF_PORT_REVERSAL;
>+ u8 owned_lane_mask = intel_cx0_get_owned_lane_mask(encoder);
> u8 maxpclk_lane = lane_reversal ? INTEL_CX0_LANE1 :
> INTEL_CX0_LANE0;
> intel_wakeref_t wakeref = intel_cx0_phy_transaction_begin(encoder);
>@@ -2948,10 +2949,9 @@ static void intel_cx0pll_enable(struct intel_encoder *encoder,
> intel_cx0_phy_lane_reset(encoder, lane_reversal);
>
> /*
>- * 3. Change Phy power state to Ready.
>- * TODO: For DP alt mode use only one lane.
>+ * 3. Change Phy power state to Ready on owned lanes.
> */
>- intel_cx0_powerdown_change_sequence(encoder, INTEL_CX0_BOTH_LANES,
>+ intel_cx0_powerdown_change_sequence(encoder, owned_lane_mask,
> CX0_P2_STATE_READY);
>
> /*
>
>base-commit: ad060dbbcfcfcba624ef1a75e1d71365a98b86d8
>--
>2.46.0
>
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