linux-kernel - [PATCH v2 01/11] phy: qcom-qmp-pcie: add pcs

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Message-Id: <20220916102340.11520-2-johan+linaro@kernel.org>
Date:   Fri, 16 Sep 2022 12:23:30 +0200
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>
Subject: [PATCH v2 01/11] phy: qcom-qmp-pcie: add pcs_misc sanity check

Make sure that the (otherwise) optional pcs_misc IO region has been
provided in case the configuration specifies a corresponding
initialisation table to avoid crashing with malformed device trees.

Note that the related debug message is now superfluous as the region is
only used when the configuration has a pcs_misc table.

Fixes: 421c9a0e9731 ("phy: qcom: qmp: Add SDM845 PCIe QMP PHY support")
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp-pcie.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
index e6bffb0e2da3..05e73625a619 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
@@ -2300,8 +2300,10 @@ static int qmp_pcie_create(struct device *dev, struct device_node *np, int id,
 	    of_device_is_compatible(dev->of_node, "qcom,ipq6018-qmp-pcie-phy"))
 		qphy->pcs_misc = qphy->pcs + 0x400;
 
-	if (!qphy->pcs_misc)
-		dev_vdbg(dev, "PHY pcs_misc-reg not used\n");
+	if (!qphy->pcs_misc) {
+		if (cfg->pcs_misc_tbl || cfg->pcs_misc_tbl_sec)
+			return -EINVAL;
+	}
 
 	qphy->pipe_clk = devm_get_clk_from_child(dev, np, NULL);
 	if (IS_ERR(qphy->pipe_clk)) {
-- 
2.35.1