This is a note to let you know that I've just added the patch titled
PCI: qcom: Disable write access to read only registers for IP v2.3.3
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pci-qcom-disable-write-access-to-read-only-registers-for-ip-v2.3.3.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a33d700e8eea76c62120cb3dbf5e01328f18319a Mon Sep 17 00:00:00 2001
From: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Date: Mon, 19 Jun 2023 20:34:00 +0530
Subject: PCI: qcom: Disable write access to read only registers for IP v2.3.3
From: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
commit a33d700e8eea76c62120cb3dbf5e01328f18319a upstream.
In the post init sequence of v2.9.0, write access to read only registers
are not disabled after updating the registers. Fix it by disabling the
access after register update.
Link: https://lore.kernel.org/r/20230619150408.8468-2-manivannan.sadhasivam@xxxxxxxxxx
Fixes: 5d76117f070d ("PCI: qcom: Add support for IPQ8074 PCIe controller")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/pci/controller/dwc/pcie-qcom.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -758,6 +758,8 @@ static int qcom_pcie_get_resources_2_4_0
if (IS_ERR(res->phy_ahb_reset))
return PTR_ERR(res->phy_ahb_reset);
+ dw_pcie_dbi_ro_wr_dis(pci);
+
return 0;
}
Patches currently in stable-queue which might be from manivannan.sadhasivam@xxxxxxxxxx are
queue-4.19/pci-qcom-disable-write-access-to-read-only-registers-for-ip-v2.3.3.patch
