phy: qcom: qmp-combo: store DP phy power state

Switching the PHY Mode requires the DisplayPort PHY to be powered off,
keep track of the DisplayPort phy power state.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on Lenovo Thinkpad T14S
Link: https://lore.kernel.org/r/20250807-topic-4ln_dp_respin-v4-3-43272d6eca92@oss.qualcomm.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: superna9999

drivers/phy/qualcomm/phy-qcom-qmp-combo.c

@@ -1853,6 +1853,7 @@ struct qmp_combo {
 	unsigned int dp_aux_cfg;
 	struct phy_configure_opts_dp dp_opts;
 	unsigned int dp_init_count;
+	bool dp_powered_on;
 
 	struct clk_fixed_rate pipe_clk_fixed;
 	struct clk_hw dp_link_hw;
@@ -3133,6 +3134,8 @@ static int qmp_combo_dp_power_on(struct phy *phy)
 	/* Configure link rate, swing, etc. */
 	cfg->configure_dp_phy(qmp);
 
+	qmp->dp_powered_on = true;
+
 	mutex_unlock(&qmp->phy_mutex);
 
 	return 0;
@@ -3147,6 +3150,8 @@ static int qmp_combo_dp_power_off(struct phy *phy)
 	/* Assert DP PHY power down */
 	writel(DP_PHY_PD_CTL_PSR_PWRDN, qmp->dp_dp_phy + QSERDES_DP_PHY_PD_CTL);
 
+	qmp->dp_powered_on = false;
+
 	mutex_unlock(&qmp->phy_mutex);
 
 	return 0;