[PATCH v2 3/4] drm/i915/display: Ensure phy is accessible on lfps configuration

[Gustavo Sousa]

Quoting Jouni Högander (2025-07-22 07:13:16-03:00)
>Ensure phy is accessible on lfps configuration by adding
>intel_cx0_phy_transaction_begin/end around it.
>
>Fixes: 9dc619680de4 ("drm/i915/display: Add function to configure LFPS sending")
>Suggested-by: Gustavo Sousa <gustavo.sousa at intel.com>
>Signed-off-by: Jouni Högander <jouni.hogander at intel.com>

Reviewed-by: Gustavo Sousa <gustavo.sousa at intel.com>

>---
> drivers/gpu/drm/i915/display/intel_cx0_phy.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
>diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.c b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
>index 2993dabdbee6..a203937d66db 100644
>--- a/drivers/gpu/drm/i915/display/intel_cx0_phy.c
>+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
>@@ -3239,6 +3239,7 @@ void intel_lnl_mac_transmit_lfps(struct intel_encoder *encoder,
>                                  const struct intel_crtc_state *crtc_state)
> {
>         struct intel_display *display = to_intel_display(encoder);
>+        intel_wakeref_t wakeref;
>         int i;
>         u8 owned_lane_mask;
> 
>@@ -3247,6 +3248,9 @@ void intel_lnl_mac_transmit_lfps(struct intel_encoder *encoder,
>                 return;
> 
>         owned_lane_mask = intel_cx0_get_owned_lane_mask(encoder);
>+
>+        wakeref = intel_cx0_phy_transaction_begin(encoder);
>+
>         for (i = 0; i < 4; i++) {
>                 int tx = i % 2 + 1;
>                 u8 lane_mask = i < 2 ? INTEL_CX0_LANE0 : INTEL_CX0_LANE1;
>@@ -3258,6 +3262,8 @@ void intel_lnl_mac_transmit_lfps(struct intel_encoder *encoder,
>                               CONTROL0_MAC_TRANSMIT_LFPS,
>                               CONTROL0_MAC_TRANSMIT_LFPS, MB_WRITE_COMMITTED);
>         }
>+
>+        intel_cx0_phy_transaction_end(encoder, wakeref);
> }
> 
> static u8 cx0_power_control_disable_val(struct intel_encoder *encoder)
>-- 
>2.43.0
>