[PATCH 6/6] radeon: Use pcie_get_readrq() and pcie_set_readrq() to simplify code

[Yijing Wang <wangyijing@huawei.com>]

Use pcie_get_readrq() and pcie_set_readrq() functions to simplify code.

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
---
 drivers/gpu/drm/radeon/evergreen.c |   19 ++++++-------------
 1 files changed, 6 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index d5b49e3..b191f92 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -1169,23 +1169,16 @@ int evergreen_set_uvd_clocks(struct radeon_device *rdev, u32 vclk, u32 dclk)
 
 void evergreen_fix_pci_max_read_req_size(struct radeon_device *rdev)
 {
-	u16 ctl, v;
-	int err;
-
-	err = pcie_capability_read_word(rdev->pdev, PCI_EXP_DEVCTL, &ctl);
-	if (err)
-		return;
-
-	v = (ctl & PCI_EXP_DEVCTL_READRQ) >> 12;
+	int readrq;
+	u16 v;
 
+	readrq = pcie_get_readrq(rdev->pdev);
+	v = ffs(readrq) - 8;
 	/* if bios or OS sets MAX_READ_REQUEST_SIZE to an invalid value, fix it
 	 * to avoid hangs or perfomance issues
 	 */
-	if ((v == 0) || (v == 6) || (v == 7)) {
-		ctl &= ~PCI_EXP_DEVCTL_READRQ;
-		ctl |= (2 << 12);
-		pcie_capability_write_word(rdev->pdev, PCI_EXP_DEVCTL, ctl);
-	}
+	if ((v == 0) || (v == 6) || (v == 7))
+		pcie_set_readrq(rdev->pdev, 512);
 }
 
 static bool dce4_is_in_vblank(struct radeon_device *rdev, int crtc)
-- 
1.7.1