staging: et131x: Use pci_dev->pcie_mpss and pcie_set_readrq() to simplify code

The PCI core caches the "PCIe Max Payload Size Supported" in
pci_dev->pcie_mpss, so use that instead of pcie_capability_read_dword().
Also use pcie_set_readrq() instead of pcie_capability_clear_and_set_word()
to simplify code.

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Mark Einon <mark.einon@gmail.com>

1 files changed, 3 insertions, 11 deletions

diff --git a/drivers/staging/et131x/et131x.c b/drivers/staging/et131x/et131x.c
index f73e58f5ef8d..876881d1826e 100644
--- a/drivers/staging/et131x/et131x.c
+++ b/drivers/staging/et131x/et131x.c
@@ -3605,17 +3605,10 @@ static int et131x_pci_init(struct et131x_adapter *adapter,
                 goto err_out;
         }
 
-        /* Let's set up the PORT LOGIC Register.  First we need to know what
-         * the max_payload_size is
-         */
-        if (pcie_capability_read_word(pdev, PCI_EXP_DEVCAP, &max_payload)) {
-                dev_err(&pdev->dev,
-                    "Could not read PCI config space for Max Payload Size\n");
-                goto err_out;
-        }
+        /* Let's set up the PORT LOGIC Register. */
 
         /* Program the Ack/Nak latency and replay timers */
-        max_payload &= 0x07;
+        max_payload = pdev->pcie_mpss;
 
         if (max_payload < 2) {
                 static const u16 acknak[2] = { 0x76, 0xD0 };
@@ -3645,8 +3638,7 @@ static int et131x_pci_init(struct et131x_adapter *adapter,
         }
 
         /* Change the max read size to 2k */
-        if (pcie_capability_clear_and_set_word(pdev, PCI_EXP_DEVCTL,
-                                PCI_EXP_DEVCTL_READRQ, 0x4 << 12)) {
+        if (pcie_set_readrq(pdev, 2048)) {
                 dev_err(&pdev->dev,
                         "Couldn't change PCI config space for Max read size\n");
                 goto err_out;