Patch "PCI: spear: Fix dw_pcie_cfg_read/write() usage" has been added to the 4.3-stable tree

Patch "PCI: spear: Fix dw_pcie_cfg_read/write() usage" has been added to the 4.3-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    PCI: spear: Fix dw_pcie_cfg_read/write() usage

to the 4.3-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-spear-fix-dw_pcie_cfg_read-write-usage.patch
and it can be found in the queue-4.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From fa3b7cbab548b15da438b0cc13aa515f7f291f4d Mon Sep 17 00:00:00 2001
From: Gabriele Paoloni <gabriele.paoloni@huawei.com>
Date: Thu, 8 Oct 2015 14:27:38 -0500
Subject: PCI: spear: Fix dw_pcie_cfg_read/write() usage

From: Gabriele Paoloni <gabriele.paoloni@huawei.com>

commit fa3b7cbab548b15da438b0cc13aa515f7f291f4d upstream.

The first argument of dw_pcie_cfg_read/write() is a 32-bit aligned address.
The second argument is the byte offset into a 32-bit word, and
dw_pcie_cfg_read/write() only look at the low two bits.

SPEAr13xx used dw_pcie_cfg_read() and dw_pcie_cfg_write() incorrectly: it
passed important address bits in the second argument, where they were
ignored.

Pass the complete 32-bit word address in the first argument and only the
2-bit offset into that word in the second argument.

Without this fix, SPEAr13xx host will never work with few buggy gen1 card
which connects with only gen1 host and also with any endpoint which would
generate a read request of more than 128 bytes.

[bhelgaas: changelog]
Reported-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Pratyush Anand <panand@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/pci/host/pcie-spear13xx.c |   26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

--- a/drivers/pci/host/pcie-spear13xx.c
+++ b/drivers/pci/host/pcie-spear13xx.c
@@ -163,34 +163,36 @@ static int spear13xx_pcie_establish_link
 	 * default value in capability register is 512 bytes. So force
 	 * it to 128 here.
 	 */
-	dw_pcie_cfg_read(pp->dbi_base, exp_cap_off + PCI_EXP_DEVCTL, 4, &val);
+	dw_pcie_cfg_read(pp->dbi_base + exp_cap_off + PCI_EXP_DEVCTL,
+				0, 2, &val);
 	val &= ~PCI_EXP_DEVCTL_READRQ;
-	dw_pcie_cfg_write(pp->dbi_base, exp_cap_off + PCI_EXP_DEVCTL, 4, val);
+	dw_pcie_cfg_write(pp->dbi_base + exp_cap_off + PCI_EXP_DEVCTL,
+				0, 2, val);
 
-	dw_pcie_cfg_write(pp->dbi_base, PCI_VENDOR_ID, 2, 0x104A);
-	dw_pcie_cfg_write(pp->dbi_base, PCI_DEVICE_ID, 2, 0xCD80);
+	dw_pcie_cfg_write(pp->dbi_base + PCI_VENDOR_ID, 0, 2, 0x104A);
+	dw_pcie_cfg_write(pp->dbi_base + PCI_VENDOR_ID, 2, 2, 0xCD80);
 
 	/*
 	 * if is_gen1 is set then handle it, so that some buggy card
 	 * also works
 	 */
 	if (spear13xx_pcie->is_gen1) {
-		dw_pcie_cfg_read(pp->dbi_base, exp_cap_off + PCI_EXP_LNKCAP, 4,
-				 &val);
+		dw_pcie_cfg_read(pp->dbi_base + exp_cap_off + PCI_EXP_LNKCAP,
+					0, 4, &val);
 		if ((val & PCI_EXP_LNKCAP_SLS) != PCI_EXP_LNKCAP_SLS_2_5GB) {
 			val &= ~((u32)PCI_EXP_LNKCAP_SLS);
 			val |= PCI_EXP_LNKCAP_SLS_2_5GB;
-			dw_pcie_cfg_write(pp->dbi_base, exp_cap_off +
-					  PCI_EXP_LNKCAP, 4, val);
+			dw_pcie_cfg_write(pp->dbi_base + exp_cap_off +
+						PCI_EXP_LNKCAP, 0, 4, val);
 		}
 
-		dw_pcie_cfg_read(pp->dbi_base, exp_cap_off + PCI_EXP_LNKCTL2, 4,
-				 &val);
+		dw_pcie_cfg_read(pp->dbi_base + exp_cap_off + PCI_EXP_LNKCTL2,
+					0, 2, &val);
 		if ((val & PCI_EXP_LNKCAP_SLS) != PCI_EXP_LNKCAP_SLS_2_5GB) {
 			val &= ~((u32)PCI_EXP_LNKCAP_SLS);
 			val |= PCI_EXP_LNKCAP_SLS_2_5GB;
-			dw_pcie_cfg_write(pp->dbi_base, exp_cap_off +
-					  PCI_EXP_LNKCTL2, 4, val);
+			dw_pcie_cfg_write(pp->dbi_base + exp_cap_off +
+						PCI_EXP_LNKCTL2, 0, 2, val);
 		}
 	}
 


Patches currently in stable-queue which might be from gabriele.paoloni@huawei.com are

queue-4.3/pci-spear-fix-dw_pcie_cfg_read-write-usage.patch