[Intel-gfx] [PATCH 6/6] drm/i915/kbl: Fix DMC load on Kabylake.

[Rodrigo Vivi]

Kabylake A0 is based on Skylake H0.

v2: Don't assume revid+7 and only load the one we are sure about.

Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
 drivers/gpu/drm/i915/intel_csr.c | 36 ++++++++++++++++++++++++++++++------
 1 file changed, 30 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_csr.c b/drivers/gpu/drm/i915/intel_csr.c
index 9e530a7..e4020ae 100644
--- a/drivers/gpu/drm/i915/intel_csr.c
+++ b/drivers/gpu/drm/i915/intel_csr.c
@@ -190,9 +190,21 @@ static struct stepping_info bxt_stepping_info[] = {
 
 static char intel_get_stepping(struct drm_device *dev)
 {
-	if (IS_SKYLAKE(dev) && (dev->pdev->revision <
-			ARRAY_SIZE(skl_stepping_info)))
-		return skl_stepping_info[dev->pdev->revision].stepping;
+	int revid = INTEL_REVID(dev);
+
+	/*
+	 * FIXME: Kabylake derivated from Skylake H0, so SKL H0
+	 * is the right firmware for KBL A0 (revid 0).
+	 * We have no visibility yet how next KBL steppings will
+	 * be handled by firmware, so let's just add support for
+	 * the only current available KBL.
+	 */
+	if (IS_KABYLAKE(dev) && revid == 0)
+		return skl_stepping_info[7].stepping;
+
+	if (IS_SKYLAKE(dev) &&
+	    revid < ARRAY_SIZE(skl_stepping_info))
+		return skl_stepping_info[revid].stepping;
 	else if (IS_BROXTON(dev) && (dev->pdev->revision <
 				ARRAY_SIZE(bxt_stepping_info)))
 		return bxt_stepping_info[dev->pdev->revision].stepping;
@@ -202,9 +214,21 @@ static char intel_get_stepping(struct drm_device *dev)
 
 static char intel_get_substepping(struct drm_device *dev)
 {
-	if (IS_SKYLAKE(dev) && (dev->pdev->revision <
-			ARRAY_SIZE(skl_stepping_info)))
-		return skl_stepping_info[dev->pdev->revision].substepping;
+	int revid = INTEL_REVID(dev);
+
+	/*
+	 * FIXME: Kabylake derivated from Skylake H0, so SKL H0
+	 * is the right firmware for KBL A0 (revid 0).
+	 * We have no visibility yet how next KBL steppings will
+	 * be handled by firmware, so let's just add support for
+	 * the only current available KBL.
+	 */
+	if (IS_KABYLAKE(dev) && revid == 0)
+		return skl_stepping_info[7].substepping;
+
+	if (IS_SKYLAKE(dev) &&
+	    revid < ARRAY_SIZE(skl_stepping_info))
+		return skl_stepping_info[revid].substepping;
 	else if (IS_BROXTON(dev) && (dev->pdev->revision <
 			ARRAY_SIZE(bxt_stepping_info)))
 		return bxt_stepping_info[dev->pdev->revision].substepping;
-- 
2.4.3