remoteproc: qcom_q6v5_pas: Do not fail if regulators are not found

Bugzilla: https://bugzilla.redhat.com/2150444

commit 8447d0e
Author: Manivannan Sadhasivam <mani@kernel.org>
Date:   Mon Aug 1 11:09:39 2022 +0530

    remoteproc: qcom_q6v5_pas: Do not fail if regulators are not found

    devm_regulator_get_optional() API will return -ENODEV if the regulator was
    not found. For the optional supplies CX, PX we should not fail in that case
    but rather continue. So let's catch that error and continue silently if
    those regulators are not found.

    The commit 3f52d11 ("remoteproc: qcom_q6v5_pas: Deal silently with
    optional px and cx regulators") was supposed to do the same but it missed
    the fact that devm_regulator_get_optional() API returns -ENODEV when the
    regulator was not found.

    Cc: Abel Vesa <abel.vesa@linaro.org>
    Fixes: 3f52d11 ("remoteproc: qcom_q6v5_pas: Deal silently with optional px and cx regulators")
    Reported-by: Steev Klimaszewski <steev@kali.org>
    Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
    Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
    Tested-by: Steev Klimaszewski <steev@kali.org>
    Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
    Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
    Link: https://lore.kernel.org/r/20220801053939.12556-1-manivannan.sadhasivam@linaro.org

Signed-off-by: Eric Chanudet <echanude@redhat.com>

Author: eric-ch

drivers/remoteproc/qcom_q6v5_pas.c

@@ -362,13 +362,25 @@ static int adsp_init_clock(struct qcom_adsp *adsp)
 static int adsp_init_regulator(struct qcom_adsp *adsp)
 {
 	adsp->cx_supply = devm_regulator_get_optional(adsp->dev, "cx");
-	if (IS_ERR(adsp->cx_supply))
-		return PTR_ERR(adsp->cx_supply);
+	if (IS_ERR(adsp->cx_supply)) {
+		if (PTR_ERR(adsp->cx_supply) == -ENODEV)
+			adsp->cx_supply = NULL;
+		else
+			return PTR_ERR(adsp->cx_supply);
+	}
 
-	regulator_set_load(adsp->cx_supply, 100000);
+	if (adsp->cx_supply)
+		regulator_set_load(adsp->cx_supply, 100000);
 
 	adsp->px_supply = devm_regulator_get_optional(adsp->dev, "px");
-	return PTR_ERR_OR_ZERO(adsp->px_supply);
+	if (IS_ERR(adsp->px_supply)) {
+		if (PTR_ERR(adsp->px_supply) == -ENODEV)
+			adsp->px_supply = NULL;
+		else
+			return PTR_ERR(adsp->px_supply);
+	}
+
+	return 0;
 }
 
 static int adsp_pds_attach(struct device *dev, struct device **devs,