[PATCH 2/3] drm/i915: get rid of dev_priv->info->has_pch_split

[Paulo Zanoni <przanoni@gmail.com>]

From: Paulo Zanoni <paulo.r.zanoni@intel.com>

Previously we had has_pch_split to tell us whether we had a PCH or not
and we also had dev_priv->pch_type to tell us which kind of PCH it
was, but it could only be used if we were 100% sure we did have a PCH.
Now that PCH_NONE was added to dev_priv->pch_type we don't need
has_pch_split anymore: we can just check for pch_type != PCH_NONE.

The HAS_PCH_{IBX,CPT,LPT} macros use dev_priv->pch_type, so they can
only be called after intel_detect_pch. The HAS_PCH_SPLIT macro looks
at dev_priv->info->has_pch_split, which is available earlier.

Since the goal is to implement HAS_PCH_SPLIT using dev_priv->pch_type
instead of dev_priv->info->has_pch_split, we need to make sure that
intel_detect_pch is called before any calls to HAS_PCH_SPLIT are made.
So we moved the intel_detect_pch call to an earlier stage.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
---
 drivers/gpu/drm/i915/i915_dma.c |    5 +++--
 drivers/gpu/drm/i915/i915_drv.c |    8 --------
 drivers/gpu/drm/i915/i915_drv.h |    3 +--
 3 files changed, 4 insertions(+), 12 deletions(-)

This patch does not solve any real problem: it's just a "suggestion"
of something we could do after the previous patch. Some people may
argue that looking at the has_pch_split variable might make it easier
for us to find out which machines actually have a pch split without
running the machine. So I really won't complain if we don't accept
this patch: patch 01 is the important one.

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 2166519..f8bc9ea 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1547,6 +1547,9 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 		goto out_mtrrfree;
 	}
 
+	/* This must be called before any calls to HAS_PCH_* */
+	intel_detect_pch(dev);
+
 	intel_irq_init(dev);
 
 	/* Try to make sure MCHBAR is enabled before poking at it */
@@ -1599,8 +1602,6 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 	/* Start out suspended */
 	dev_priv->mm.suspended = 1;
 
-	intel_detect_pch(dev);
-
 	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 		ret = i915_load_modeset_init(dev);
 		if (ret < 0) {
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 7d0eb82..1794833 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -225,7 +225,6 @@ static const struct intel_device_info intel_ironlake_d_info = {
 	.gen = 5,
 	.need_gfx_hws = 1, .has_hotplug = 1,
 	.has_bsd_ring = 1,
-	.has_pch_split = 1,
 };
 
 static const struct intel_device_info intel_ironlake_m_info = {
@@ -233,7 +232,6 @@ static const struct intel_device_info intel_ironlake_m_info = {
 	.need_gfx_hws = 1, .has_hotplug = 1,
 	.has_fbc = 1,
 	.has_bsd_ring = 1,
-	.has_pch_split = 1,
 };
 
 static const struct intel_device_info intel_sandybridge_d_info = {
@@ -242,7 +240,6 @@ static const struct intel_device_info intel_sandybridge_d_info = {
 	.has_bsd_ring = 1,
 	.has_blt_ring = 1,
 	.has_llc = 1,
-	.has_pch_split = 1,
 	.has_force_wake = 1,
 };
 
@@ -253,7 +250,6 @@ static const struct intel_device_info intel_sandybridge_m_info = {
 	.has_bsd_ring = 1,
 	.has_blt_ring = 1,
 	.has_llc = 1,
-	.has_pch_split = 1,
 	.has_force_wake = 1,
 };
 
@@ -263,7 +259,6 @@ static const struct intel_device_info intel_ivybridge_d_info = {
 	.has_bsd_ring = 1,
 	.has_blt_ring = 1,
 	.has_llc = 1,
-	.has_pch_split = 1,
 	.has_force_wake = 1,
 };
 
@@ -274,7 +269,6 @@ static const struct intel_device_info intel_ivybridge_m_info = {
 	.has_bsd_ring = 1,
 	.has_blt_ring = 1,
 	.has_llc = 1,
-	.has_pch_split = 1,
 	.has_force_wake = 1,
 };
 
@@ -302,7 +296,6 @@ static const struct intel_device_info intel_haswell_d_info = {
 	.has_bsd_ring = 1,
 	.has_blt_ring = 1,
 	.has_llc = 1,
-	.has_pch_split = 1,
 	.has_force_wake = 1,
 };
 
@@ -312,7 +305,6 @@ static const struct intel_device_info intel_haswell_m_info = {
 	.has_bsd_ring = 1,
 	.has_blt_ring = 1,
 	.has_llc = 1,
-	.has_pch_split = 1,
 	.has_force_wake = 1,
 };
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b12e79a..89025ab 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -285,7 +285,6 @@ struct intel_device_info {
 	u8 is_crestline:1;
 	u8 is_ivybridge:1;
 	u8 is_valleyview:1;
-	u8 has_pch_split:1;
 	u8 has_force_wake:1;
 	u8 is_haswell:1;
 	u8 has_fbc:1;
@@ -1113,13 +1112,13 @@ struct drm_i915_file_private {
 #define HAS_PIPE_CXSR(dev) (INTEL_INFO(dev)->has_pipe_cxsr)
 #define I915_HAS_FBC(dev) (INTEL_INFO(dev)->has_fbc)
 
-#define HAS_PCH_SPLIT(dev) (INTEL_INFO(dev)->has_pch_split)
 #define HAS_PIPE_CONTROL(dev) (INTEL_INFO(dev)->gen >= 5)
 
 #define INTEL_PCH_TYPE(dev) (((struct drm_i915_private *)(dev)->dev_private)->pch_type)
 #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_SPLIT(dev) (INTEL_PCH_TYPE(dev) != PCH_NONE)
 
 #define HAS_FORCE_WAKE(dev) (INTEL_INFO(dev)->has_force_wake)
 
-- 
1.7.10.2