linux-kernel - [PATCH] PCI: qcom-ep: Fix the write to PARF_MHI_CLOCK_RESET

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Date:   Tue, 27 Jun 2023 19:40:36 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     lpieralisi@...nel.org, kw@...ux.com
Cc:     robh@...nel.org, bhelgaas@...gle.com, linux-pci@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Krzysztof Wilczyński <kwilczynski@...nel.org>
Subject: [PATCH] PCI: qcom-ep: Fix the write to PARF_MHI_CLOCK_RESET_CTRL register

Instead of writing the updated "val" that clears PARF_MSTR_AXI_CLK_EN,
"val" is read again. Fix it!

Fixes: c457ac029e44 ("PCI: qcom-ep: Gate Master AXI clock to MHI bus during L1SS")
Reported-by: Krzysztof Wilczyński <kwilczynski@...nel.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/pci/controller/dwc/pcie-qcom-ep.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index 0fe7f06f2102..267e1247d548 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -415,7 +415,7 @@ static int qcom_pcie_perst_deassert(struct dw_pcie *pci)
 	/* Gate Master AXI clock to MHI bus during L1SS */
 	val = readl_relaxed(pcie_ep->parf + PARF_MHI_CLOCK_RESET_CTRL);
 	val &= ~PARF_MSTR_AXI_CLK_EN;
-	val = readl_relaxed(pcie_ep->parf + PARF_MHI_CLOCK_RESET_CTRL);
+	writel_relaxed(val, pcie_ep->parf + PARF_MHI_CLOCK_RESET_CTRL);
 
 	dw_pcie_ep_init_notify(&pcie_ep->pci.ep);
 
-- 
2.25.1