From: Mahesh Kumar <mahesh1.kumar@xxxxxxxxx>
This patch adds IPC support for platforms. This patch enables IPC
only for BXT platform as for SKL recommendation is to keep is disabled
This patch also adds kernel command-line option to enable/disable
the IPC if required.
Signed-off-by: Mahesh Kumar <mahesh1.kumar@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.c | 5 +++++
drivers/gpu/drm/i915/i915_params.c | 5 +++++
drivers/gpu/drm/i915/i915_params.h | 1 +
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_drv.h | 1 +
drivers/gpu/drm/i915/intel_pm.c | 21 +++++++++++++++++++++
6 files changed, 34 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 0a4f18d..22d84e6 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1335,6 +1335,11 @@ int i915_driver_load(struct pci_dev *pdev, const struct pci_device_id *ent)
intel_runtime_pm_enable(dev_priv);
+ /*
+ * Now enable the IPC for supported platforms
+ */
+ intel_enable_ipc(dev_priv);
+
/* Everything is in place, we can now relax! */
DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
driver.name, driver.major, driver.minor, driver.patchlevel,
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 768ad89..cc41b8d 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -62,6 +62,7 @@ struct i915_params i915 __read_mostly = {
.inject_load_failure = 0,
.enable_dpcd_backlight = false,
.enable_gvt = false,
+ .enable_ipc = true,
};
module_param_named(modeset, i915.modeset, int, 0400);
@@ -233,3 +234,7 @@ MODULE_PARM_DESC(enable_dpcd_backlight,
module_param_named(enable_gvt, i915.enable_gvt, bool, 0400);
MODULE_PARM_DESC(enable_gvt,
"Enable support for Intel GVT-g graphics virtualization host support(default:false)");
+
+module_param_named(enable_ipc, i915.enable_ipc, bool, 0400);
+MODULE_PARM_DESC(enable_ipc,
+ "Enable Isochronous Priority Control (default:true)");
diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index 3a0dd78..f99b9b9 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -65,6 +65,7 @@ struct i915_params {
bool enable_dp_mst;
bool enable_dpcd_backlight;
bool enable_gvt;
+ bool enable_ipc;
};
extern struct i915_params i915 __read_mostly;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index b38445c..75b5b52 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6139,6 +6139,7 @@ enum {
#define DISP_FBC_WM_DIS (1<<15)
#define DISP_ARB_CTL2 _MMIO(0x45004)
#define DISP_DATA_PARTITION_5_6 (1<<6)
+#define DISP_IPC_ENABLE (1<<3)
#define DBUF_CTL _MMIO(0x45008)
#define DBUF_POWER_REQUEST (1<<31)
#define DBUF_POWER_STATE (1<<30)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 66cb46c..56c8ac8 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1753,6 +1753,7 @@ void skl_write_plane_wm(struct intel_crtc *intel_crtc,
uint32_t ilk_pipe_pixel_rate(const struct intel_crtc_state *pipe_config);
bool ilk_disable_lp_wm(struct drm_device *dev);
int sanitize_rc6_option(struct drm_i915_private *dev_priv, int enable_rc6);
+void intel_enable_ipc(struct drm_i915_private *dev_priv);
static inline int intel_enable_rc6(void)
{
return i915.enable_rc6;
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index d4390e4..8d0037c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4793,6 +4793,27 @@ void intel_update_watermarks(struct drm_crtc *crtc)
}
/*
+ * enable IPC for Supported Platforms
+ */
+void intel_enable_ipc(struct drm_i915_private *dev_priv)
+{
+ u32 val;
+
+ /* enable IPC only for Broxton for now*/
+ if (!IS_BROXTON(dev_priv))
+ return;
+
+ val = I915_READ(DISP_ARB_CTL2);
+
+ if (i915.enable_ipc)
+ val |= DISP_IPC_ENABLE;
+ else
+ val &= ~DISP_IPC_ENABLE;
+
+ I915_WRITE(DISP_ARB_CTL2, val);
+}
+
+/*
* Lock protecting IPS related data structures
*/
DEFINE_SPINLOCK(mchdev_lock);
--
2.8.3
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