drm/radeon/kms: add support for gen2 pcie link speeds
Supported on rv6xx/r7xx/evergreen. Cards come up in gen1 mode.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index eaf4fba..11344c7 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -39,6 +39,7 @@
static void evergreen_gpu_init(struct radeon_device *rdev);
void evergreen_fini(struct radeon_device *rdev);
+static void evergreen_pcie_gen2_enable(struct radeon_device *rdev);
void evergreen_pre_page_flip(struct radeon_device *rdev, int crtc)
{
@@ -2767,6 +2768,9 @@
{
int r;
+ /* enable pcie gen2 link */
+ evergreen_pcie_gen2_enable(rdev);
+
if (!rdev->me_fw || !rdev->pfp_fw || !rdev->rlc_fw) {
r = r600_init_microcode(rdev);
if (r) {
@@ -3049,3 +3053,52 @@
rdev->bios = NULL;
radeon_dummy_page_fini(rdev);
}
+
+static void evergreen_pcie_gen2_enable(struct radeon_device *rdev)
+{
+ u32 link_width_cntl, speed_cntl;
+
+ 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;
+
+ speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+ if ((speed_cntl & LC_OTHER_SIDE_EVER_SENT_GEN2) ||
+ (speed_cntl & LC_OTHER_SIDE_SUPPORTS_GEN2)) {
+
+ link_width_cntl = RREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL);
+ link_width_cntl &= ~LC_UPCONFIGURE_DIS;
+ WREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL, link_width_cntl);
+
+ speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+ speed_cntl &= ~LC_TARGET_LINK_SPEED_OVERRIDE_EN;
+ WREG32_PCIE_P(PCIE_LC_SPEED_CNTL, speed_cntl);
+
+ speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+ speed_cntl |= LC_CLR_FAILED_SPD_CHANGE_CNT;
+ WREG32_PCIE_P(PCIE_LC_SPEED_CNTL, speed_cntl);
+
+ speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+ speed_cntl &= ~LC_CLR_FAILED_SPD_CHANGE_CNT;
+ WREG32_PCIE_P(PCIE_LC_SPEED_CNTL, speed_cntl);
+
+ speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+ speed_cntl |= LC_GEN2_EN_STRAP;
+ WREG32_PCIE_P(PCIE_LC_SPEED_CNTL, speed_cntl);
+
+ } else {
+ link_width_cntl = RREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL);
+ /* XXX: only disable it if gen1 bridge vendor == 0x111d or 0x1106 */
+ if (1)
+ link_width_cntl |= LC_UPCONFIGURE_DIS;
+ else
+ link_width_cntl &= ~LC_UPCONFIGURE_DIS;
+ WREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL, link_width_cntl);
+ }
+}