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drm/i915: Removed the read of RP_STATE_CAP from sysfs/debugfs functions 

The frequency values(Rp0, Rp1, Rpn) reported by RP_STATE_CAP register
are stored, initially by the Driver, inside the dev_priv->rps structure.
Since these values are expected to remain same throughout, there is no real
need to read this register, on dynamic basis, from certain debugfs/sysfs
functions and the values can be instead retrieved from the dev_priv->rps
structure when needed.
For the i915_frequency_info debugfs interface, the frequency values from the
RP_STATE_CAP register only should be used, to indicate the actual Hw state,
since it is principally used for the debugging purpose.

v2: Reverted the changes in i915_frequency_info function, to continue report
    back the frequency values, as per the actual Hw state (Chris)

Signed-off-by: Akash Goel <akash.goel@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Akash Goel 2015-02-26 16:09:47 +05:30 committed by Daniel Vetter
parent b4f2bf4c02
commit bc4d91f699
2 changed files with 17 additions and 54 deletions
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32
drivers/gpu/drm/i915/i915_debugfs.c
View File

@ -4180,7 +4180,7 @@ i915_max_freq_set(void *data, u64 val)
{
struct drm_device *dev = data;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 rp_state_cap, hw_max, hw_min;
u32 hw_max, hw_min;
int ret;
if (INTEL_INFO(dev)->gen < 6)
@ -4197,18 +4197,10 @@ i915_max_freq_set(void *data, u64 val)
/*
* Turbo will still be enabled, but won't go above the set value.
*/
if (IS_VALLEYVIEW(dev)) {
val = intel_freq_opcode(dev_priv, val);
val = intel_freq_opcode(dev_priv, val);
hw_max = dev_priv->rps.max_freq;
hw_min = dev_priv->rps.min_freq;
} else {
val = intel_freq_opcode(dev_priv, val);
rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
hw_max = dev_priv->rps.max_freq;
hw_min = (rp_state_cap >> 16) & 0xff;
}
hw_max = dev_priv->rps.max_freq;
hw_min = dev_priv->rps.min_freq;
if (val < hw_min || val > hw_max || val < dev_priv->rps.min_freq_softlimit) {
mutex_unlock(&dev_priv->rps.hw_lock);
@ -4255,7 +4247,7 @@ i915_min_freq_set(void *data, u64 val)
{
struct drm_device *dev = data;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 rp_state_cap, hw_max, hw_min;
u32 hw_max, hw_min;
int ret;
if (INTEL_INFO(dev)->gen < 6)
@ -4272,18 +4264,10 @@ i915_min_freq_set(void *data, u64 val)
/*
* Turbo will still be enabled, but won't go below the set value.
*/
if (IS_VALLEYVIEW(dev)) {
val = intel_freq_opcode(dev_priv, val);
val = intel_freq_opcode(dev_priv, val);
hw_max = dev_priv->rps.max_freq;
hw_min = dev_priv->rps.min_freq;
} else {
val = intel_freq_opcode(dev_priv, val);
rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
hw_max = dev_priv->rps.max_freq;
hw_min = (rp_state_cap >> 16) & 0xff;
}
hw_max = dev_priv->rps.max_freq;
hw_min = dev_priv->rps.min_freq;
if (val < hw_min || val > hw_max || val > dev_priv->rps.max_freq_softlimit) {
mutex_unlock(&dev_priv->rps.hw_lock);

39
drivers/gpu/drm/i915/i915_sysfs.c
View File

@ -487,38 +487,17 @@ static ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr
struct drm_minor *minor = dev_to_drm_minor(kdev);
struct drm_device *dev = minor->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 val, rp_state_cap;
ssize_t ret;
u32 val;
ret = mutex_lock_interruptible(&dev->struct_mutex);
if (ret)
return ret;
intel_runtime_pm_get(dev_priv);
rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
intel_runtime_pm_put(dev_priv);
mutex_unlock(&dev->struct_mutex);
if (attr == &dev_attr_gt_RP0_freq_mhz) {
if (IS_VALLEYVIEW(dev))
val = intel_gpu_freq(dev_priv, dev_priv->rps.rp0_freq);
else
val = intel_gpu_freq(dev_priv,
((rp_state_cap & 0x0000ff) >> 0));
} else if (attr == &dev_attr_gt_RP1_freq_mhz) {
if (IS_VALLEYVIEW(dev))
val = intel_gpu_freq(dev_priv, dev_priv->rps.rp1_freq);
else
val = intel_gpu_freq(dev_priv,
((rp_state_cap & 0x00ff00) >> 8));
} else if (attr == &dev_attr_gt_RPn_freq_mhz) {
if (IS_VALLEYVIEW(dev))
val = intel_gpu_freq(dev_priv, dev_priv->rps.min_freq);
else
val = intel_gpu_freq(dev_priv,
((rp_state_cap & 0xff0000) >> 16));
} else {
if (attr == &dev_attr_gt_RP0_freq_mhz)
val = intel_gpu_freq(dev_priv, dev_priv->rps.rp0_freq);
else if (attr == &dev_attr_gt_RP1_freq_mhz)
val = intel_gpu_freq(dev_priv, dev_priv->rps.rp1_freq);
else if (attr == &dev_attr_gt_RPn_freq_mhz)
val = intel_gpu_freq(dev_priv, dev_priv->rps.min_freq);
else
BUG();
}
return snprintf(buf, PAGE_SIZE, "%d\n", val);
}