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authorAlex Deucher <alexdeucher@gmail.com>2011-01-06 18:49:34 -0500
committerDave Airlie <airlied@redhat.com>2011-01-07 14:11:13 +1000
commit3313e3d4333ccbf8bd7c816775cfe9aca623bd8a (patch)
tree541755e1eb2f582dc6e2d3cf7abedab0820377d9 /drivers/gpu/drm/radeon/r600.c
parentf598aa7593427ffe3a61e7767c34bd695a5e7ed0 (diff)
drm/radeon/kms: add pcie get/set lane support for r6xx/r7xx/evergreen
Signed-off-by: Alex Deucher <alexdeucher@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/r600.c')
-rw-r--r--drivers/gpu/drm/radeon/r600.c118
1 files changed, 118 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 279794c391e..60ad8c03081 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -3531,3 +3531,121 @@ void r600_ioctl_wait_idle(struct radeon_device *rdev, struct radeon_bo *bo)
} else
WREG32(R_005480_HDP_MEM_COHERENCY_FLUSH_CNTL, 0x1);
}
+
+void r600_set_pcie_lanes(struct radeon_device *rdev, int lanes)
+{
+ u32 link_width_cntl, mask, target_reg;
+
+ if (rdev->flags & RADEON_IS_IGP)
+ return;
+
+ if (!(rdev->flags & RADEON_IS_PCIE))
+ return;
+
+ /* x2 cards have a special sequence */
+ if (ASIC_IS_X2(rdev))
+ return;
+
+ /* FIXME wait for idle */
+
+ switch (lanes) {
+ case 0:
+ mask = RADEON_PCIE_LC_LINK_WIDTH_X0;
+ break;
+ case 1:
+ mask = RADEON_PCIE_LC_LINK_WIDTH_X1;
+ break;
+ case 2:
+ mask = RADEON_PCIE_LC_LINK_WIDTH_X2;
+ break;
+ case 4:
+ mask = RADEON_PCIE_LC_LINK_WIDTH_X4;
+ break;
+ case 8:
+ mask = RADEON_PCIE_LC_LINK_WIDTH_X8;
+ break;
+ case 12:
+ mask = RADEON_PCIE_LC_LINK_WIDTH_X12;
+ break;
+ case 16:
+ default:
+ mask = RADEON_PCIE_LC_LINK_WIDTH_X16;
+ break;
+ }
+
+ link_width_cntl = RREG32_PCIE_P(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 |
+ R600_PCIE_LC_RECONFIG_ARC_MISSING_ESCAPE);
+ link_width_cntl |= mask;
+
+ WREG32_PCIE_P(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_P(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)
+{
+ u32 link_width_cntl;
+
+ if (rdev->flags & RADEON_IS_IGP)
+ return 0;
+
+ if (!(rdev->flags & RADEON_IS_PCIE))
+ return 0;
+
+ /* x2 cards have a special sequence */
+ if (ASIC_IS_X2(rdev))
+ return 0;
+
+ /* FIXME wait for idle */
+
+ link_width_cntl = RREG32_PCIE_P(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:
+ return 2;
+ case RADEON_PCIE_LC_LINK_WIDTH_X4:
+ return 4;
+ case RADEON_PCIE_LC_LINK_WIDTH_X8:
+ return 8;
+ case RADEON_PCIE_LC_LINK_WIDTH_X16:
+ default:
+ return 16;
+ }
+}
+