[Intel-gfx] [PATCH 8/9] drm/i915: Do not enable package C8 on unsupported hardware

[Rodrigo Vivi]

From: Chris Wilson <ch...@chris-wilson.co.uk>

If the hardware does not support package C8, then do not even schedule
work to enable it. Thereby we can eliminate a bunch of dangerous work.

Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Paulo Zanoni <paulo.r.zan...@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zan...@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.v...@gmail.com>
---
 drivers/gpu/drm/i915/i915_drv.h      |  1 +
 drivers/gpu/drm/i915/intel_display.c | 15 +++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b12d942..bb6a302 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1791,6 +1791,7 @@ struct drm_i915_file_private {
 #define HAS_POWER_WELL(dev)    (IS_HASWELL(dev))
 #define HAS_FPGA_DBG_UNCLAIMED(dev)    (INTEL_INFO(dev)->has_fpga_dbg)
 #define HAS_PSR(dev)           (IS_HASWELL(dev))
+#define HAS_PC8(dev)           (IS_HASWELL(dev)) /* XXX HSW:ULX */
 
 #define INTEL_PCH_DEVICE_ID_MASK               0xff00
 #define INTEL_PCH_IBX_DEVICE_ID_TYPE           0x3b00
diff --git a/drivers/gpu/drm/i915/intel_display.c 
b/drivers/gpu/drm/i915/intel_display.c
index cfcad82..b39d0df 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6473,6 +6473,9 @@ static void __hsw_disable_package_c8(struct 
drm_i915_private *dev_priv)
 
 void hsw_enable_package_c8(struct drm_i915_private *dev_priv)
 {
+       if (!HAS_PC8(dev_priv->dev))
+               return;
+
        mutex_lock(&dev_priv->pc8.lock);
        __hsw_enable_package_c8(dev_priv);
        mutex_unlock(&dev_priv->pc8.lock);
@@ -6480,6 +6483,9 @@ void hsw_enable_package_c8(struct drm_i915_private 
*dev_priv)
 
 void hsw_disable_package_c8(struct drm_i915_private *dev_priv)
 {
+       if (!HAS_PC8(dev_priv->dev))
+               return;
+
        mutex_lock(&dev_priv->pc8.lock);
        __hsw_disable_package_c8(dev_priv);
        mutex_unlock(&dev_priv->pc8.lock);
@@ -6517,6 +6523,9 @@ static void hsw_update_package_c8(struct drm_device *dev)
        struct drm_i915_private *dev_priv = dev->dev_private;
        bool allow;
 
+       if (!HAS_PC8(dev_priv->dev))
+               return;
+
        if (!i915_enable_pc8)
                return;
 
@@ -6540,6 +6549,9 @@ done:
 
 static void hsw_package_c8_gpu_idle(struct drm_i915_private *dev_priv)
 {
+       if (!HAS_PC8(dev_priv->dev))
+               return;
+
        mutex_lock(&dev_priv->pc8.lock);
        if (!dev_priv->pc8.gpu_idle) {
                dev_priv->pc8.gpu_idle = true;
@@ -6550,6 +6562,9 @@ static void hsw_package_c8_gpu_idle(struct 
drm_i915_private *dev_priv)
 
 static void hsw_package_c8_gpu_busy(struct drm_i915_private *dev_priv)
 {
+       if (!HAS_PC8(dev_priv->dev))
+               return;
+
        mutex_lock(&dev_priv->pc8.lock);
        if (dev_priv->pc8.gpu_idle) {
                dev_priv->pc8.gpu_idle = false;
-- 
1.8.3.1

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