[Intel-gfx] [PATCH 03/10] drm/i915: PCH_NOP

[Ben Widawsky]

Given certain fusing options discussed in the previous patch, it's
possible to end up with platforms that normally have PCH but that PCH
doesn't actually exist. In many cases, this is easily remedied with
setting 0 pipes. This covers the other corners.

Requiring this is a symptom of improper code splitting (using
HAS_PCH_SPLIT instead of proper GEN checking, basically). I do not want
to fix this.

Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_drv.h      | 2 ++
 drivers/gpu/drm/i915/intel_display.c | 4 +++-
 drivers/gpu/drm/i915/intel_lvds.c    | 4 ++++
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 587dca0..ceed199 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -461,6 +461,7 @@ enum intel_pch {
 	PCH_IBX,	/* Ibexpeak PCH */
 	PCH_CPT,	/* Cougarpoint PCH */
 	PCH_LPT,	/* Lynxpoint PCH */
+	PCH_NOP,
 };
 
 enum intel_sbi_destination {
@@ -1351,6 +1352,7 @@ struct drm_i915_file_private {
 #define HAS_PCH_LPT(dev) (INTEL_PCH_TYPE(dev) == PCH_LPT)
 #define HAS_PCH_CPT(dev) (INTEL_PCH_TYPE(dev) == PCH_CPT)
 #define HAS_PCH_IBX(dev) (INTEL_PCH_TYPE(dev) == PCH_IBX)
+#define HAS_PCH_NOP(dev) (INTEL_PCH_TYPE(dev) == PCH_NOP)
 #define HAS_PCH_SPLIT(dev) (INTEL_PCH_TYPE(dev) != PCH_NONE)
 
 #define HAS_FORCE_WAKE(dev) (INTEL_INFO(dev)->has_force_wake)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index d6dbffd..1f0624e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5085,7 +5085,9 @@ static void lpt_init_pch_refclk(struct drm_device *dev)
  */
 void intel_init_pch_refclk(struct drm_device *dev)
 {
-	if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
+	if (HAS_PCH_NOP(dev))
+		return;
+	else if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
 		ironlake_init_pch_refclk(dev);
 	else if (HAS_PCH_LPT(dev))
 		lpt_init_pch_refclk(dev);
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 6b24fc5..613ac43 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -1018,6 +1018,10 @@ static bool compute_is_dual_link_lvds(struct intel_lvds_encoder *lvds_encoder)
 
 static bool intel_lvds_supported(struct drm_device *dev)
 {
+
+	if (HAS_PCH_NOP(dev))
+		return false;
+
 	/* With the introduction of the PCH we gained a dedicated
 	 * LVDS presence pin, use it. */
 	if (HAS_PCH_SPLIT(dev))
-- 
1.8.1.5