drm/i915/display: Ensure phy is accessible on lfps configuration

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@intel.com>
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>
Link: https://lore.kernel.org/r/20250722125618.1842615-4-jouni.hogander@intel.com
(cherry picked from commit cf433f94f188782166598300c4c05274fd13c5a7)
Signed-off-by: Tvrtko Ursulin <tursulin@ursulin.net>

diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.c b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
index 2993dabdbee6edfd36e3c91fa0b7d7c2a8c83556..a203937d66dbedf1e7c69c6fe124249ceed5d4c6 100644 (file)
--- 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)