From 174f1a71cc692ddb4bc30ec93edb6d7eb370b382 Mon Sep 17 00:00:00 2001 From: Alexandre Bounine Date: Tue, 22 Mar 2016 14:25:48 -0700 Subject: [PATCH] rapidio/tsi721: fix hardcoded MRRS setting Remove use of hardcoded setting for Maximum Read Request Size (MRRS) value and use one set by PCIe bus driver. Using hardcoded value can cause PCIe bus errors on platforms that have tsi721 device on PCIe path that allows only smaller read request sizes. This fix is applicable to kernel versions starting from v3.2. Signed-off-by: Alexandre Bounine Cc: Matt Porter Cc: Aurelien Jacquiot Cc: Andre van Herk Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rapidio/devices/tsi721.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/rapidio/devices/tsi721.c b/drivers/rapidio/devices/tsi721.c index eeca70ddbf61..f57ee9d69910 100644 --- a/drivers/rapidio/devices/tsi721.c +++ b/drivers/rapidio/devices/tsi721.c @@ -2426,11 +2426,9 @@ static int tsi721_probe(struct pci_dev *pdev, BUG_ON(!pci_is_pcie(pdev)); - /* Clear "no snoop" and "relaxed ordering" bits, use default MRRS. */ + /* Clear "no snoop" and "relaxed ordering" bits. */ pcie_capability_clear_and_set_word(pdev, PCI_EXP_DEVCTL, - PCI_EXP_DEVCTL_READRQ | PCI_EXP_DEVCTL_RELAX_EN | - PCI_EXP_DEVCTL_NOSNOOP_EN, - PCI_EXP_DEVCTL_READRQ_512B); + PCI_EXP_DEVCTL_RELAX_EN | PCI_EXP_DEVCTL_NOSNOOP_EN, 0); /* Adjust PCIe completion timeout. */ pcie_capability_clear_and_set_word(pdev, PCI_EXP_DEVCTL2, 0xf, 0x2); -- 2.20.1