From: Daniel Vetter <daniel.vetter@xxxxxxxxx>
This removes two anti-patterns:
- Locking shouldn't be used to synchronize with async work (of any
form, whether callbacks, workers or other threads). This is what the
mutex_lock/unlock seems to have been for in intel_csr_load_program.
Instead ordering should be ensured with the generic
wait_for_completion()/complete(). Or more specific functions
provided by the core kernel like e.g.
flush_work()/cancel_work_sync() in the case of synchronizing with a
work item.
- Don't invent own completion like the following code did with the
(already removed) wait_for(csr_load_status_get()) pattern - it's
really hard to get these right when you want them to be _really_
correct (and be fast) in all cases. Furthermore it's easier to read
code using the well-known primitives than new ones using
non-standard names.
Cc: Damien Lespiau <damien.lespiau@xxxxxxxxx>
Cc: Imre Deak <imre.deak@xxxxxxxxx>
Cc: Sunil Kamath <sunil.kamath@xxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Signed-off-by: Animesh Manna <animesh.manna@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_dma.c | 1 -
drivers/gpu/drm/i915/i915_drv.c | 6 -----
drivers/gpu/drm/i915/i915_drv.h | 10 ---------
drivers/gpu/drm/i915/intel_csr.c | 48 +---------------------------------------
drivers/gpu/drm/i915/intel_drv.h | 3 ---
5 files changed, 1 insertion(+), 67 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index cdd3fbd..e8a503b 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -831,7 +831,6 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
spin_lock_init(&dev_priv->mmio_flip_lock);
mutex_init(&dev_priv->sb_lock);
mutex_init(&dev_priv->modeset_restore_lock);
- mutex_init(&dev_priv->csr_lock);
intel_pm_setup(dev);
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 0d6775a..6e7edce 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1017,12 +1017,6 @@ static int skl_suspend_complete(struct drm_i915_private *dev_priv)
{
/* Enabling DC6 is not a hard requirement to enter runtime D3 */
- /*
- * This is to ensure that CSR isn't identified as loaded before
- * CSR-loading program is called during runtime-resume.
- */
- intel_csr_load_status_set(dev_priv, FW_UNINITIALIZED);
-
skl_uninit_cdclk(dev_priv);
return 0;
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index a2eac8e..f986cc2 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -734,12 +734,6 @@ struct intel_uncore {
#define for_each_fw_domain(domain__, dev_priv__, i__) \
for_each_fw_domain_mask(domain__, FORCEWAKE_ALL, dev_priv__, i__)
-enum csr_state {
- FW_UNINITIALIZED = 0,
- FW_LOADED,
- FW_FAILED
-};
-
struct intel_csr {
const char *fw_path;
__be32 *dmc_payload;
@@ -747,7 +741,6 @@ struct intel_csr {
uint32_t mmio_count;
uint32_t mmioaddr[8];
uint32_t mmiodata[8];
- enum csr_state state;
};
#define DEV_INFO_FOR_EACH_FLAG(func, sep) \
@@ -1699,9 +1692,6 @@ struct drm_i915_private {
struct intel_csr csr;
- /* Display CSR-related protection */
- struct mutex csr_lock;
-
struct intel_gmbus gmbus[GMBUS_NUM_PINS];
/** gmbus_mutex protects against concurrent usage of the single hw gmbus
diff --git a/drivers/gpu/drm/i915/intel_csr.c b/drivers/gpu/drm/i915/intel_csr.c
index d3e78aa..99e4d6a 100644
--- a/drivers/gpu/drm/i915/intel_csr.c
+++ b/drivers/gpu/drm/i915/intel_csr.c
@@ -197,40 +197,6 @@ static char intel_get_substepping(struct drm_device *dev)
}
/**
- * intel_csr_load_status_get() - to get firmware loading status.
- * @dev_priv: i915 device.
- *
- * This function helps to get the firmware loading status.
- *
- * Return: Firmware loading status.
- */
-enum csr_state intel_csr_load_status_get(struct drm_i915_private *dev_priv)
-{
- enum csr_state state;
-
- mutex_lock(&dev_priv->csr_lock);
- state = dev_priv->csr.state;
- mutex_unlock(&dev_priv->csr_lock);
-
- return state;
-}
-
-/**
- * intel_csr_load_status_set() - help to set firmware loading status.
- * @dev_priv: i915 device.
- * @state: enumeration of firmware loading status.
- *
- * Set the firmware loading status.
- */
-void intel_csr_load_status_set(struct drm_i915_private *dev_priv,
- enum csr_state state)
-{
- mutex_lock(&dev_priv->csr_lock);
- dev_priv->csr.state = state;
- mutex_unlock(&dev_priv->csr_lock);
-}
-
-/**
* intel_csr_load_program() - write the firmware from memory to register.
* @dev: drm device.
*
@@ -249,7 +215,6 @@ void intel_csr_load_program(struct drm_device *dev)
return;
}
- mutex_lock(&dev_priv->csr_lock);
fw_size = dev_priv->csr.dmc_fw_size;
for (i = 0; i < fw_size; i++)
I915_WRITE(CSR_PROGRAM_BASE + i * 4,
@@ -259,9 +224,6 @@ void intel_csr_load_program(struct drm_device *dev)
I915_WRITE(dev_priv->csr.mmioaddr[i],
dev_priv->csr.mmiodata[i]);
}
-
- dev_priv->csr.state = FW_LOADED;
- mutex_unlock(&dev_priv->csr_lock);
}
static void finish_csr_load(const struct firmware *fw, void *context)
@@ -419,11 +381,6 @@ void intel_csr_ucode_init(struct drm_device *dev)
csr->fw_path = I915_CSR_SKL;
else if (IS_BROXTON(dev))
csr->fw_path = I915_CSR_BXT;
- else {
- DRM_ERROR("Unexpected: no known CSR firmware for platform\n");
- intel_csr_load_status_set(dev_priv, FW_FAILED);
- return;
- }
DRM_DEBUG_KMS("Loading %s\n", csr->fw_path);
@@ -438,10 +395,8 @@ void intel_csr_ucode_init(struct drm_device *dev)
&dev_priv->dev->pdev->dev,
GFP_KERNEL, dev_priv,
finish_csr_load);
- if (ret) {
+ if (ret)
i915_firmware_load_error_print(csr->fw_path, ret);
- intel_csr_load_status_set(dev_priv, FW_FAILED);
- }
}
/**
@@ -458,6 +413,5 @@ void intel_csr_ucode_fini(struct drm_device *dev)
if (!HAS_CSR(dev))
return;
- intel_csr_load_status_set(dev_priv, FW_FAILED);
kfree(dev_priv->csr.dmc_payload);
}
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 020e6b4..46143f6 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1149,9 +1149,6 @@ u32 skl_plane_ctl_rotation(unsigned int rotation);
/* intel_csr.c */
void intel_csr_ucode_init(struct drm_device *dev);
-enum csr_state intel_csr_load_status_get(struct drm_i915_private *dev_priv);
-void intel_csr_load_status_set(struct drm_i915_private *dev_priv,
- enum csr_state state);
void intel_csr_load_program(struct drm_device *dev);
void intel_csr_ucode_fini(struct drm_device *dev);
--
2.0.2
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