drm/radeon: update r600 set/get pcie lane config

Updated to the preferred programming sequence.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/r600.c

@@ -4523,7 +4523,7 @@ void r600_ioctl_wait_idle(struct radeon_device *rdev, struct radeon_bo *bo)
 
 void r600_set_pcie_lanes(struct radeon_device *rdev, int lanes)
 {
-	u32 link_width_cntl, mask, target_reg;
+	u32 link_width_cntl, mask;
 
 	if (rdev->flags & RADEON_IS_IGP)
 		return;
@@ -4535,7 +4535,7 @@ void r600_set_pcie_lanes(struct radeon_device *rdev, int lanes)
 	if (ASIC_IS_X2(rdev))
 		return;
 
-	/* FIXME wait for idle */
+	radeon_gui_idle(rdev);
 
 	switch (lanes) {
 	case 0:
@@ -4554,53 +4554,24 @@ void r600_set_pcie_lanes(struct radeon_device *rdev, int lanes)
 		mask = RADEON_PCIE_LC_LINK_WIDTH_X8;
 		break;
 	case 12:
+		/* not actually supported */
 		mask = RADEON_PCIE_LC_LINK_WIDTH_X12;
 		break;
 	case 16:
-	default:
 		mask = RADEON_PCIE_LC_LINK_WIDTH_X16;
 		break;
+	default:
+		DRM_ERROR("invalid pcie lane request: %d\n", lanes);
+		return;
 	}
 
 	link_width_cntl = RREG32_PCIE_PORT(RADEON_PCIE_LC_LINK_WIDTH_CNTL);
-
-	if ((link_width_cntl & RADEON_PCIE_LC_LINK_WIDTH_RD_MASK) ==
-	    (mask << RADEON_PCIE_LC_LINK_WIDTH_RD_SHIFT))
-		return;
-
-	if (link_width_cntl & R600_PCIE_LC_UPCONFIGURE_DIS)
-		return;
-
-	link_width_cntl &= ~(RADEON_PCIE_LC_LINK_WIDTH_MASK |
-			     RADEON_PCIE_LC_RECONFIG_NOW |
-			     R600_PCIE_LC_RENEGOTIATE_EN |
+	link_width_cntl &= ~RADEON_PCIE_LC_LINK_WIDTH_MASK;
+	link_width_cntl |= mask << RADEON_PCIE_LC_LINK_WIDTH_SHIFT;
+	link_width_cntl |= (RADEON_PCIE_LC_RECONFIG_NOW |
 			    R600_PCIE_LC_RECONFIG_ARC_MISSING_ESCAPE);
-	link_width_cntl |= mask;
 
 	WREG32_PCIE_PORT(RADEON_PCIE_LC_LINK_WIDTH_CNTL, link_width_cntl);
-
-        /* some northbridges can renegotiate the link rather than requiring                                  
-         * a complete re-config.                                                                             
-         * e.g., AMD 780/790 northbridges (pci ids: 0x5956, 0x5957, 0x5958, etc.)                            
-         */
-        if (link_width_cntl & R600_PCIE_LC_RENEGOTIATION_SUPPORT)
-		link_width_cntl |= R600_PCIE_LC_RENEGOTIATE_EN | R600_PCIE_LC_UPCONFIGURE_SUPPORT;
-        else
-		link_width_cntl |= R600_PCIE_LC_RECONFIG_ARC_MISSING_ESCAPE;
-
-	WREG32_PCIE_PORT(RADEON_PCIE_LC_LINK_WIDTH_CNTL, (link_width_cntl |
-						       RADEON_PCIE_LC_RECONFIG_NOW));
-
-        if (rdev->family >= CHIP_RV770)
-		target_reg = R700_TARGET_AND_CURRENT_PROFILE_INDEX;
-        else
-		target_reg = R600_TARGET_AND_CURRENT_PROFILE_INDEX;
-
-        /* wait for lane set to complete */
-        link_width_cntl = RREG32(target_reg);
-        while (link_width_cntl == 0xffffffff)
-		link_width_cntl = RREG32(target_reg);
-
 }
 
 int r600_get_pcie_lanes(struct radeon_device *rdev)
@@ -4617,13 +4588,11 @@ int r600_get_pcie_lanes(struct radeon_device *rdev)
 	if (ASIC_IS_X2(rdev))
 		return 0;
 
-	/* FIXME wait for idle */
+	radeon_gui_idle(rdev);
 
 	link_width_cntl = RREG32_PCIE_PORT(RADEON_PCIE_LC_LINK_WIDTH_CNTL);
 
 	switch ((link_width_cntl & RADEON_PCIE_LC_LINK_WIDTH_RD_MASK) >> RADEON_PCIE_LC_LINK_WIDTH_RD_SHIFT) {
-	case RADEON_PCIE_LC_LINK_WIDTH_X0:
-		return 0;
 	case RADEON_PCIE_LC_LINK_WIDTH_X1:
 		return 1;
 	case RADEON_PCIE_LC_LINK_WIDTH_X2:
@@ -4632,6 +4601,10 @@ int r600_get_pcie_lanes(struct radeon_device *rdev)
 		return 4;
 	case RADEON_PCIE_LC_LINK_WIDTH_X8:
 		return 8;
+	case RADEON_PCIE_LC_LINK_WIDTH_X12:
+		/* not actually supported */
+		return 12;
+	case RADEON_PCIE_LC_LINK_WIDTH_X0:
 	case RADEON_PCIE_LC_LINK_WIDTH_X16:
 	default:
 		return 16;