[PATCH v2 1/1] drm: Prefer pcie_capability_read_word()

18 Nov 2019

Commit 8c0d3a02c130 ("PCI: Add accessors for PCI Express Capability")
added accessors for the PCI Express Capability so that drivers didn't
need to be aware of differences between v1 and v2 of the PCI
Express Capability.
Replace pci_read_config_word() and pci_write_config_word() calls with
pcie_capability_read_word() and pcie_capability_write_word().
Signed-off-by: Frederick Lawler fred@fredlawl.com
---
V2
- Squash both drm commits into one
- Rebase ontop of d46eac1e658b
---
 drivers/gpu/drm/amd/amdgpu/cik.c | 63 ++++++++++++++++-----------
 drivers/gpu/drm/amd/amdgpu/si.c  | 71 +++++++++++++++++++------------
 drivers/gpu/drm/radeon/cik.c     | 70 ++++++++++++++++++------------
 drivers/gpu/drm/radeon/si.c      | 73 ++++++++++++++++++++------------
 4 files changed, 174 insertions(+), 103 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/cik.c b/drivers/gpu/drm/amd/amdgpu/cik.c
index 3067bb874032..f369e3408ed2 100644
--- a/drivers/gpu/drm/amd/amdgpu/cik.c
+++ b/drivers/gpu/drm/amd/amdgpu/cik.c
@@ -1384,7 +1384,6 @@ static int cik_set_vce_clocks(struct amdgpu_device *adev, u32 evclk, u32 ecclk)
 static void cik_pcie_gen3_enable(struct amdgpu_device *adev)
 {
    struct pci_dev *root = adev->pdev->bus->self;
-	int bridge_pos, gpu_pos;
    u32 speed_cntl, current_data_rate;
    int i;
    u16 tmp16;
@@ -1419,12 +1418,7 @@ static void cik_pcie_gen3_enable(struct amdgpu_device *adev)
    	DRM_INFO("enabling PCIE gen 2 link speeds, disable with amdgpu.pcie_gen2=0\n");
    }
-	bridge_pos = pci_pcie_cap(root);
-	if (!bridge_pos)
-		return;
-
-	gpu_pos = pci_pcie_cap(adev->pdev);
-	if (!gpu_pos)
+	if (!pci_is_pcie(root) || !pci_is_pcie(adev->pdev))
    	return;
if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN3) {
@@ -1434,14 +1428,17 @@ static void cik_pcie_gen3_enable(struct amdgpu_device *adev)
    		u16 bridge_cfg2, gpu_cfg2;
    		u32 max_lw, current_lw, tmp;
-			pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL, &bridge_cfg);
-			pci_read_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL, &gpu_cfg);
+			pcie_capability_read_word(root, PCI_EXP_LNKCTL,
+						  &bridge_cfg);
+			pcie_capability_read_word(adev->pdev, PCI_EXP_LNKCTL,
+						  &gpu_cfg);
tmp16 = bridge_cfg | PCI_EXP_LNKCTL_HAWD;
-			pci_write_config_word(root, bridge_pos + PCI_EXP_LNKCTL, tmp16);
+			pcie_capability_write_word(root, PCI_EXP_LNKCTL, tmp16);
tmp16 = gpu_cfg | PCI_EXP_LNKCTL_HAWD;
-			pci_write_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL, tmp16);
+			pcie_capability_write_word(adev->pdev, PCI_EXP_LNKCTL,
+						   tmp16);
tmp = RREG32_PCIE(ixPCIE_LC_STATUS1);
    		max_lw = (tmp & PCIE_LC_STATUS1__LC_DETECTED_LINK_WIDTH_MASK) >>
@@ -1465,15 +1462,23 @@ static void cik_pcie_gen3_enable(struct amdgpu_device *adev)
for (i = 0; i < 10; i++) {
    			/* check status */
-				pci_read_config_word(adev->pdev, gpu_pos + PCI_EXP_DEVSTA, &tmp16);
+				pcie_capability_read_word(adev->pdev,
+							  PCI_EXP_DEVSTA,
+							  &tmp16);
    			if (tmp16 & PCI_EXP_DEVSTA_TRPND)
    				break;
-				pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL, &bridge_cfg);
-				pci_read_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL, &gpu_cfg);
+				pcie_capability_read_word(root, PCI_EXP_LNKCTL,
+							  &bridge_cfg);
+				pcie_capability_read_word(adev->pdev,
+							  PCI_EXP_LNKCTL,
+							  &gpu_cfg);
-				pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL2, &bridge_cfg2);
-				pci_read_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL2, &gpu_cfg2);
+				pcie_capability_read_word(root, PCI_EXP_LNKCTL2,
+							  &bridge_cfg2);
+				pcie_capability_read_word(adev->pdev,
+							  PCI_EXP_LNKCTL2,
+							  &gpu_cfg2);
tmp = RREG32_PCIE(ixPCIE_LC_CNTL4);
    			tmp |= PCIE_LC_CNTL4__LC_SET_QUIESCE_MASK;
@@ -1486,18 +1491,25 @@ static void cik_pcie_gen3_enable(struct amdgpu_device *adev)
    			msleep(100);
/* linkctl */
-				pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL, &tmp16);
+				pcie_capability_read_word(root, PCI_EXP_LNKCTL,
+							  &tmp16);
    			tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
    			tmp16 |= (bridge_cfg & PCI_EXP_LNKCTL_HAWD);
-				pci_write_config_word(root, bridge_pos + PCI_EXP_LNKCTL, tmp16);
+				pcie_capability_write_word(root, PCI_EXP_LNKCTL,
+							   tmp16);
-				pci_read_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL, &tmp16);
+				pcie_capability_read_word(adev->pdev,
+							  PCI_EXP_LNKCTL,
+							  &tmp16);
    			tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
    			tmp16 |= (gpu_cfg & PCI_EXP_LNKCTL_HAWD);
-				pci_write_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL, tmp16);
+				pcie_capability_write_word(adev->pdev,
+							   PCI_EXP_LNKCTL,
+							   tmp16);
/* linkctl2 */
-				pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL2, &tmp16);
+				pcie_capability_read_word(root, PCI_EXP_LNKCTL2,
+							  &tmp16);
    			tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP |
    				   PCI_EXP_LNKCTL2_TX_MARGIN);
    			tmp16 |= (bridge_cfg2 &
@@ -1511,7 +1523,9 @@ static void cik_pcie_gen3_enable(struct amdgpu_device *adev)
    			tmp16 |= (gpu_cfg2 &
    				  (PCI_EXP_LNKCTL2_ENTER_COMP |
    				   PCI_EXP_LNKCTL2_TX_MARGIN));
-				pci_write_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL2, tmp16);
+				pcie_capability_write_word(adev->pdev,
+							   PCI_EXP_LNKCTL2,
+							   tmp16);
tmp = RREG32_PCIE(ixPCIE_LC_CNTL4);
    			tmp &= ~PCIE_LC_CNTL4__LC_SET_QUIESCE_MASK;
@@ -1526,15 +1540,16 @@ static void cik_pcie_gen3_enable(struct amdgpu_device *adev)
    speed_cntl &= ~PCIE_LC_SPEED_CNTL__LC_FORCE_DIS_SW_SPEED_CHANGE_MASK;
    WREG32_PCIE(ixPCIE_LC_SPEED_CNTL, speed_cntl);
-	pci_read_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL2, &tmp16);
+	pcie_capability_read_word(adev->pdev, PCI_EXP_LNKCTL2, &tmp16);
    tmp16 &= ~PCI_EXP_LNKCTL2_TLS;
+
    if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN3)
    	tmp16 |= PCI_EXP_LNKCTL2_TLS_8_0GT; /* gen3 */
    else if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN2)
    	tmp16 |= PCI_EXP_LNKCTL2_TLS_5_0GT; /* gen2 */
    else
    	tmp16 |= PCI_EXP_LNKCTL2_TLS_2_5GT; /* gen1 */
-	pci_write_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL2, tmp16);
+	pcie_capability_write_word(adev->pdev, PCI_EXP_LNKCTL2, tmp16);
speed_cntl = RREG32_PCIE(ixPCIE_LC_SPEED_CNTL);
    speed_cntl |= PCIE_LC_SPEED_CNTL__LC_INITIATE_LINK_SPEED_CHANGE_MASK;
diff --git a/drivers/gpu/drm/amd/amdgpu/si.c b/drivers/gpu/drm/amd/amdgpu/si.c
index a7dcb0d0f039..9f82be879224 100644
--- a/drivers/gpu/drm/amd/amdgpu/si.c
+++ b/drivers/gpu/drm/amd/amdgpu/si.c
@@ -1633,7 +1633,6 @@ static void si_init_golden_registers(struct amdgpu_device *adev)
 static void si_pcie_gen3_enable(struct amdgpu_device *adev)
 {
    struct pci_dev *root = adev->pdev->bus->self;
-	int bridge_pos, gpu_pos;
    u32 speed_cntl, current_data_rate;
    int i;
    u16 tmp16;
@@ -1668,12 +1667,7 @@ static void si_pcie_gen3_enable(struct amdgpu_device *adev)
    	DRM_INFO("enabling PCIE gen 2 link speeds, disable with amdgpu.pcie_gen2=0\n");
    }
-	bridge_pos = pci_pcie_cap(root);
-	if (!bridge_pos)
-		return;
-
-	gpu_pos = pci_pcie_cap(adev->pdev);
-	if (!gpu_pos)
+	if (!pci_is_pcie(root) || !pci_is_pcie(adev->pdev))
    	return;
if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN3) {
@@ -1682,14 +1676,17 @@ static void si_pcie_gen3_enable(struct amdgpu_device *adev)
    		u16 bridge_cfg2, gpu_cfg2;
    		u32 max_lw, current_lw, tmp;
-			pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL, &bridge_cfg);
-			pci_read_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL, &gpu_cfg);
+			pcie_capability_read_word(root, PCI_EXP_LNKCTL,
+						  &bridge_cfg);
+			pcie_capability_read_word(adev->pdev, PCI_EXP_LNKCTL,
+						  &gpu_cfg);
tmp16 = bridge_cfg | PCI_EXP_LNKCTL_HAWD;
-			pci_write_config_word(root, bridge_pos + PCI_EXP_LNKCTL, tmp16);
+			pcie_capability_write_word(root, PCI_EXP_LNKCTL, tmp16);
tmp16 = gpu_cfg | PCI_EXP_LNKCTL_HAWD;
-			pci_write_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL, tmp16);
+			pcie_capability_write_word(adev->pdev, PCI_EXP_LNKCTL,
+						   tmp16);
tmp = RREG32_PCIE(PCIE_LC_STATUS1);
    		max_lw = (tmp & LC_DETECTED_LINK_WIDTH_MASK) >> LC_DETECTED_LINK_WIDTH_SHIFT;
@@ -1706,15 +1703,23 @@ static void si_pcie_gen3_enable(struct amdgpu_device *adev)
    		}
for (i = 0; i < 10; i++) {
-				pci_read_config_word(adev->pdev, gpu_pos + PCI_EXP_DEVSTA, &tmp16);
+				pcie_capability_read_word(adev->pdev,
+							  PCI_EXP_DEVSTA,
+							  &tmp16);
    			if (tmp16 & PCI_EXP_DEVSTA_TRPND)
    				break;
-				pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL, &bridge_cfg);
-				pci_read_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL, &gpu_cfg);
+				pcie_capability_read_word(root, PCI_EXP_LNKCTL,
+							  &bridge_cfg);
+				pcie_capability_read_word(adev->pdev,
+							  PCI_EXP_LNKCTL,
+							  &gpu_cfg);
-				pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL2, &bridge_cfg2);
-				pci_read_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL2, &gpu_cfg2);
+				pcie_capability_read_word(root, PCI_EXP_LNKCTL2,
+							  &bridge_cfg2);
+				pcie_capability_read_word(adev->pdev,
+							  PCI_EXP_LNKCTL2,
+							  &gpu_cfg2);
tmp = RREG32_PCIE_PORT(PCIE_LC_CNTL4);
    			tmp |= LC_SET_QUIESCE;
@@ -1726,31 +1731,44 @@ static void si_pcie_gen3_enable(struct amdgpu_device *adev)
mdelay(100);
-				pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL, &tmp16);
+				pcie_capability_read_word(root, PCI_EXP_LNKCTL,
+							  &tmp16);
    			tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
    			tmp16 |= (bridge_cfg & PCI_EXP_LNKCTL_HAWD);
-				pci_write_config_word(root, bridge_pos + PCI_EXP_LNKCTL, tmp16);
+				pcie_capability_write_word(root, PCI_EXP_LNKCTL,
+							   tmp16);
-				pci_read_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL, &tmp16);
+				pcie_capability_read_word(adev->pdev,
+							  PCI_EXP_LNKCTL,
+							  &tmp16);
    			tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
    			tmp16 |= (gpu_cfg & PCI_EXP_LNKCTL_HAWD);
-				pci_write_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL, tmp16);
+				pcie_capability_write_word(adev->pdev,
+							   PCI_EXP_LNKCTL,
+							   tmp16);
-				pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL2, &tmp16);
+				pcie_capability_read_word(root, PCI_EXP_LNKCTL2,
+							  &tmp16);
    			tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP |
    				   PCI_EXP_LNKCTL2_TX_MARGIN);
    			tmp16 |= (bridge_cfg2 &
    				  (PCI_EXP_LNKCTL2_ENTER_COMP |
    				   PCI_EXP_LNKCTL2_TX_MARGIN));
-				pci_write_config_word(root, bridge_pos + PCI_EXP_LNKCTL2, tmp16);
+				pcie_capability_write_word(root,
+							   PCI_EXP_LNKCTL2,
+							   tmp16);
-				pci_read_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL2, &tmp16);
+				pcie_capability_read_word(adev->pdev,
+							  PCI_EXP_LNKCTL2,
+							  &tmp16);
    			tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP |
    				   PCI_EXP_LNKCTL2_TX_MARGIN);
    			tmp16 |= (gpu_cfg2 &
    				  (PCI_EXP_LNKCTL2_ENTER_COMP |
    				   PCI_EXP_LNKCTL2_TX_MARGIN));
-				pci_write_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL2, tmp16);
+				pcie_capability_write_word(adev->pdev,
+							   PCI_EXP_LNKCTL2,
+							   tmp16);
tmp = RREG32_PCIE_PORT(PCIE_LC_CNTL4);
    			tmp &= ~LC_SET_QUIESCE;
@@ -1763,15 +1781,16 @@ static void si_pcie_gen3_enable(struct amdgpu_device *adev)
    speed_cntl &= ~LC_FORCE_DIS_SW_SPEED_CHANGE;
    WREG32_PCIE_PORT(PCIE_LC_SPEED_CNTL, speed_cntl);
-	pci_read_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL2, &tmp16);
+	pcie_capability_read_word(adev->pdev, PCI_EXP_LNKCTL2, &tmp16);
    tmp16 &= ~PCI_EXP_LNKCTL2_TLS;
+
    if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN3)
    	tmp16 |= PCI_EXP_LNKCTL2_TLS_8_0GT; /* gen3 */
    else if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN2)
    	tmp16 |= PCI_EXP_LNKCTL2_TLS_5_0GT; /* gen2 */
    else
    	tmp16 |= PCI_EXP_LNKCTL2_TLS_2_5GT; /* gen1 */
-	pci_write_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL2, tmp16);
+	pcie_capability_write_word(adev->pdev, PCI_EXP_LNKCTL2, tmp16);
speed_cntl = RREG32_PCIE_PORT(PCIE_LC_SPEED_CNTL);
    speed_cntl |= LC_INITIATE_LINK_SPEED_CHANGE;
diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index a280442c81aa..09a4709e67f0 100644
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -9504,7 +9504,6 @@ static void cik_pcie_gen3_enable(struct radeon_device *rdev)
 {
    struct pci_dev *root = rdev->pdev->bus->self;
    enum pci_bus_speed speed_cap;
-	int bridge_pos, gpu_pos;
    u32 speed_cntl, current_data_rate;
    int i;
    u16 tmp16;
@@ -9546,12 +9545,7 @@ static void cik_pcie_gen3_enable(struct radeon_device *rdev)
    	DRM_INFO("enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0\n");
    }
-	bridge_pos = pci_pcie_cap(root);
-	if (!bridge_pos)
-		return;
-
-	gpu_pos = pci_pcie_cap(rdev->pdev);
-	if (!gpu_pos)
+	if (!pci_is_pcie(root) || !pci_is_pcie(rdev->pdev))
    	return;
if (speed_cap == PCIE_SPEED_8_0GT) {
@@ -9561,14 +9555,17 @@ static void cik_pcie_gen3_enable(struct radeon_device *rdev)
    		u16 bridge_cfg2, gpu_cfg2;
    		u32 max_lw, current_lw, tmp;
-			pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL, &bridge_cfg);
-			pci_read_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL, &gpu_cfg);
+			pcie_capability_read_word(root, PCI_EXP_LNKCTL,
+						  &bridge_cfg);
+			pcie_capability_read_word(rdev->pdev, PCI_EXP_LNKCTL,
+						  &gpu_cfg);
tmp16 = bridge_cfg | PCI_EXP_LNKCTL_HAWD;
-			pci_write_config_word(root, bridge_pos + PCI_EXP_LNKCTL, tmp16);
+			pcie_capability_write_word(root, PCI_EXP_LNKCTL, tmp16);
tmp16 = gpu_cfg | PCI_EXP_LNKCTL_HAWD;
-			pci_write_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL, tmp16);
+			pcie_capability_write_word(rdev->pdev, PCI_EXP_LNKCTL,
+						   tmp16);
tmp = RREG32_PCIE_PORT(PCIE_LC_STATUS1);
    		max_lw = (tmp & LC_DETECTED_LINK_WIDTH_MASK) >> LC_DETECTED_LINK_WIDTH_SHIFT;
@@ -9586,15 +9583,23 @@ static void cik_pcie_gen3_enable(struct radeon_device *rdev)
for (i = 0; i < 10; i++) {
    			/* check status */
-				pci_read_config_word(rdev->pdev, gpu_pos + PCI_EXP_DEVSTA, &tmp16);
+				pcie_capability_read_word(rdev->pdev,
+							  PCI_EXP_DEVSTA,
+							  &tmp16);
    			if (tmp16 & PCI_EXP_DEVSTA_TRPND)
    				break;
-				pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL, &bridge_cfg);
-				pci_read_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL, &gpu_cfg);
+				pcie_capability_read_word(root, PCI_EXP_LNKCTL,
+							  &bridge_cfg);
+				pcie_capability_read_word(rdev->pdev,
+							  PCI_EXP_LNKCTL,
+							  &gpu_cfg);
-				pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL2, &bridge_cfg2);
-				pci_read_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL2, &gpu_cfg2);
+				pcie_capability_read_word(root, PCI_EXP_LNKCTL2,
+							  &bridge_cfg2);
+				pcie_capability_read_word(rdev->pdev,
+							  PCI_EXP_LNKCTL2,
+							  &gpu_cfg2);
tmp = RREG32_PCIE_PORT(PCIE_LC_CNTL4);
    			tmp |= LC_SET_QUIESCE;
@@ -9607,32 +9612,45 @@ static void cik_pcie_gen3_enable(struct radeon_device *rdev)
    			msleep(100);
/* linkctl */
-				pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL, &tmp16);
+				pcie_capability_read_word(root, PCI_EXP_LNKCTL,
+							  &tmp16);
    			tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
    			tmp16 |= (bridge_cfg & PCI_EXP_LNKCTL_HAWD);
-				pci_write_config_word(root, bridge_pos + PCI_EXP_LNKCTL, tmp16);
+				pcie_capability_write_word(root, PCI_EXP_LNKCTL,
+							   tmp16);
-				pci_read_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL, &tmp16);
+				pcie_capability_read_word(rdev->pdev,
+							  PCI_EXP_LNKCTL,
+							  &tmp16);
    			tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
    			tmp16 |= (gpu_cfg & PCI_EXP_LNKCTL_HAWD);
-				pci_write_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL, tmp16);
+				pcie_capability_write_word(rdev->pdev,
+							   PCI_EXP_LNKCTL,
+							   tmp16);
/* linkctl2 */
-				pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL2, &tmp16);
+				pcie_capability_read_word(root, PCI_EXP_LNKCTL2,
+							  &tmp16);
    			tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP |
    				   PCI_EXP_LNKCTL2_TX_MARGIN);
    			tmp16 |= (bridge_cfg2 &
    				  (PCI_EXP_LNKCTL2_ENTER_COMP |
    				   PCI_EXP_LNKCTL2_TX_MARGIN));
-				pci_write_config_word(root, bridge_pos + PCI_EXP_LNKCTL2, tmp16);
+				pcie_capability_write_word(root,
+							   PCI_EXP_LNKCTL2,
+							   tmp16);
-				pci_read_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL2, &tmp16);
+				pcie_capability_read_word(rdev->pdev,
+							  PCI_EXP_LNKCTL2,
+							  &tmp16);
    			tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP |
    				   PCI_EXP_LNKCTL2_TX_MARGIN);
    			tmp16 |= (gpu_cfg2 &
    				  (PCI_EXP_LNKCTL2_ENTER_COMP |
    				   PCI_EXP_LNKCTL2_TX_MARGIN));
-				pci_write_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL2, tmp16);
+				pcie_capability_write_word(rdev->pdev,
+							   PCI_EXP_LNKCTL2,
+							   tmp16);
tmp = RREG32_PCIE_PORT(PCIE_LC_CNTL4);
    			tmp &= ~LC_SET_QUIESCE;
@@ -9646,7 +9664,7 @@ static void cik_pcie_gen3_enable(struct radeon_device *rdev)
    speed_cntl &= ~LC_FORCE_DIS_SW_SPEED_CHANGE;
    WREG32_PCIE_PORT(PCIE_LC_SPEED_CNTL, speed_cntl);
-	pci_read_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL2, &tmp16);
+	pcie_capability_read_word(rdev->pdev, PCI_EXP_LNKCTL2, &tmp16);
    tmp16 &= ~PCI_EXP_LNKCTL2_TLS;
    if (speed_cap == PCIE_SPEED_8_0GT)
    	tmp16 |= PCI_EXP_LNKCTL2_TLS_8_0GT; /* gen3 */
@@ -9654,7 +9672,7 @@ static void cik_pcie_gen3_enable(struct radeon_device *rdev)
    	tmp16 |= PCI_EXP_LNKCTL2_TLS_5_0GT; /* gen2 */
    else
    	tmp16 |= PCI_EXP_LNKCTL2_TLS_2_5GT; /* gen1 */
-	pci_write_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL2, tmp16);
+	pcie_capability_write_word(rdev->pdev, PCI_EXP_LNKCTL2, tmp16);
speed_cntl = RREG32_PCIE_PORT(PCIE_LC_SPEED_CNTL);
    speed_cntl |= LC_INITIATE_LINK_SPEED_CHANGE;
diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c
index 529e70a42019..67a98b3370d1 100644
--- a/drivers/gpu/drm/radeon/si.c
+++ b/drivers/gpu/drm/radeon/si.c
@@ -3257,7 +3257,7 @@ static void si_gpu_init(struct radeon_device *rdev)
    	/* XXX what about 12? */
    	rdev->config.si.tile_config |= (3 << 0);
    	break;
-	}	
+	}
    switch ((mc_arb_ramcfg & NOOFBANK_MASK) >> NOOFBANK_SHIFT) {
    case 0: /* four banks */
    	rdev->config.si.tile_config |= 0 << 4;
@@ -7087,7 +7087,6 @@ static void si_pcie_gen3_enable(struct radeon_device *rdev)
 {
    struct pci_dev *root = rdev->pdev->bus->self;
    enum pci_bus_speed speed_cap;
-	int bridge_pos, gpu_pos;
    u32 speed_cntl, current_data_rate;
    int i;
    u16 tmp16;
@@ -7129,12 +7128,7 @@ static void si_pcie_gen3_enable(struct radeon_device *rdev)
    	DRM_INFO("enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0\n");
    }
-	bridge_pos = pci_pcie_cap(root);
-	if (!bridge_pos)
-		return;
-
-	gpu_pos = pci_pcie_cap(rdev->pdev);
-	if (!gpu_pos)
+	if (!pci_is_pcie(root) || !pci_is_pcie(rdev->pdev))
    	return;
if (speed_cap == PCIE_SPEED_8_0GT) {
@@ -7144,14 +7138,17 @@ static void si_pcie_gen3_enable(struct radeon_device *rdev)
    		u16 bridge_cfg2, gpu_cfg2;
    		u32 max_lw, current_lw, tmp;
-			pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL, &bridge_cfg);
-			pci_read_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL, &gpu_cfg);
+			pcie_capability_read_word(root, PCI_EXP_LNKCTL,
+						  &bridge_cfg);
+			pcie_capability_read_word(rdev->pdev, PCI_EXP_LNKCTL,
+						  &gpu_cfg);
tmp16 = bridge_cfg | PCI_EXP_LNKCTL_HAWD;
-			pci_write_config_word(root, bridge_pos + PCI_EXP_LNKCTL, tmp16);
+			pcie_capability_write_word(root, PCI_EXP_LNKCTL, tmp16);
tmp16 = gpu_cfg | PCI_EXP_LNKCTL_HAWD;
-			pci_write_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL, tmp16);
+			pcie_capability_write_word(rdev->pdev, PCI_EXP_LNKCTL,
+						   tmp16);
tmp = RREG32_PCIE(PCIE_LC_STATUS1);
    		max_lw = (tmp & LC_DETECTED_LINK_WIDTH_MASK) >> LC_DETECTED_LINK_WIDTH_SHIFT;
@@ -7169,15 +7166,23 @@ static void si_pcie_gen3_enable(struct radeon_device *rdev)
for (i = 0; i < 10; i++) {
    			/* check status */
-				pci_read_config_word(rdev->pdev, gpu_pos + PCI_EXP_DEVSTA, &tmp16);
+				pcie_capability_read_word(rdev->pdev,
+							  PCI_EXP_DEVSTA,
+							  &tmp16);
    			if (tmp16 & PCI_EXP_DEVSTA_TRPND)
    				break;
-				pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL, &bridge_cfg);
-				pci_read_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL, &gpu_cfg);
+				pcie_capability_read_word(root, PCI_EXP_LNKCTL,
+							  &bridge_cfg);
+				pcie_capability_read_word(rdev->pdev,
+							  PCI_EXP_LNKCTL,
+							  &gpu_cfg);
-				pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL2, &bridge_cfg2);
-				pci_read_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL2, &gpu_cfg2);
+				pcie_capability_read_word(root, PCI_EXP_LNKCTL2,
+							  &bridge_cfg2);
+				pcie_capability_read_word(rdev->pdev,
+							  PCI_EXP_LNKCTL2,
+							  &gpu_cfg2);
tmp = RREG32_PCIE_PORT(PCIE_LC_CNTL4);
    			tmp |= LC_SET_QUIESCE;
@@ -7190,32 +7195,46 @@ static void si_pcie_gen3_enable(struct radeon_device *rdev)
    			msleep(100);
/* linkctl */
-				pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL, &tmp16);
+				pcie_capability_read_word(root, PCI_EXP_LNKCTL,
+							  &tmp16);
    			tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
    			tmp16 |= (bridge_cfg & PCI_EXP_LNKCTL_HAWD);
-				pci_write_config_word(root, bridge_pos + PCI_EXP_LNKCTL, tmp16);
+				pcie_capability_write_word(root,
+							   PCI_EXP_LNKCTL,
+							   tmp16);
-				pci_read_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL, &tmp16);
+				pcie_capability_read_word(rdev->pdev,
+							  PCI_EXP_LNKCTL,
+							  &tmp16);
    			tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
    			tmp16 |= (gpu_cfg & PCI_EXP_LNKCTL_HAWD);
-				pci_write_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL, tmp16);
+				pcie_capability_write_word(rdev->pdev,
+							   PCI_EXP_LNKCTL,
+							   tmp16);
/* linkctl2 */
-				pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL2, &tmp16);
+				pcie_capability_read_word(root, PCI_EXP_LNKCTL2,
+							  &tmp16);
    			tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP |
    				   PCI_EXP_LNKCTL2_TX_MARGIN);
    			tmp16 |= (bridge_cfg2 &
    				  (PCI_EXP_LNKCTL2_ENTER_COMP |
    				   PCI_EXP_LNKCTL2_TX_MARGIN));
-				pci_write_config_word(root, bridge_pos + PCI_EXP_LNKCTL2, tmp16);
+				pcie_capability_write_word(root,
+							   PCI_EXP_LNKCTL2,
+							   tmp16);
-				pci_read_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL2, &tmp16);
+				pcie_capability_read_word(rdev->pdev,
+							  PCI_EXP_LNKCTL2,
+							  &tmp16);
    			tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP |
    				   PCI_EXP_LNKCTL2_TX_MARGIN);
    			tmp16 |= (gpu_cfg2 &
    				  (PCI_EXP_LNKCTL2_ENTER_COMP |
    				   PCI_EXP_LNKCTL2_TX_MARGIN));
-				pci_write_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL2, tmp16);
+				pcie_capability_write_word(rdev->pdev,
+							   PCI_EXP_LNKCTL2,
+							   tmp16);
tmp = RREG32_PCIE_PORT(PCIE_LC_CNTL4);
    			tmp &= ~LC_SET_QUIESCE;
@@ -7229,7 +7248,7 @@ static void si_pcie_gen3_enable(struct radeon_device *rdev)
    speed_cntl &= ~LC_FORCE_DIS_SW_SPEED_CHANGE;
    WREG32_PCIE_PORT(PCIE_LC_SPEED_CNTL, speed_cntl);
-	pci_read_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL2, &tmp16);
+	pcie_capability_read_word(rdev->pdev, PCI_EXP_LNKCTL2, &tmp16);
    tmp16 &= ~PCI_EXP_LNKCTL2_TLS;
    if (speed_cap == PCIE_SPEED_8_0GT)
    	tmp16 |= PCI_EXP_LNKCTL2_TLS_8_0GT; /* gen3 */
@@ -7237,7 +7256,7 @@ static void si_pcie_gen3_enable(struct radeon_device *rdev)
    	tmp16 |= PCI_EXP_LNKCTL2_TLS_5_0GT; /* gen2 */
    else
    	tmp16 |= PCI_EXP_LNKCTL2_TLS_2_5GT; /* gen1 */
-	pci_write_config_word(rdev->pdev, gpu_pos + PCI_EXP_LNKCTL2, tmp16);
+	pcie_capability_write_word(rdev->pdev, PCI_EXP_LNKCTL2, tmp16);
speed_cntl = RREG32_PCIE_PORT(PCIE_LC_SPEED_CNTL);
    speed_cntl |= LC_INITIATE_LINK_SPEED_CHANGE;
-- 
2.20.1


    

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[PATCH v2 1/1] drm: Prefer pcie_capability_read_word()