[RFC 10/22] drm/i915/slpc: Update current requested frequency

[tom.orourke@intel.com]

From: Tom O'Rourke <Tom.O'Rourke@intel.com>

When SLPC is controlling requested frequency, the rps.cur_freq
value is not used to make the frequency request.

Before using rps.cur_freq in sysfs or debugfs, read
requested frequency from register to get the value
most recently requested by SLPC firmware.

Signed-off-by: Tom O'Rourke <Tom.O'Rourke@intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 6 ++++++
 drivers/gpu/drm/i915/i915_sysfs.c   | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 0b3550f..b995d4e 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1132,6 +1132,9 @@ static int i915_frequency_info(struct seq_file *m, void *unused)
 
 	flush_delayed_work(&dev_priv->rps.delayed_resume_work);
 
+	if (HAS_SLPC(dev))
+		dev_priv->rps.cur_freq = (I915_READ(GEN6_RPNSWREQ) >> 23);
+
 	if (IS_GEN5(dev)) {
 		u16 rgvswctl = I915_READ16(MEMSWCTL);
 		u16 rgvstat = I915_READ16(MEMSTAT_ILK);
@@ -2355,6 +2358,9 @@ static int i915_rps_boost_info(struct seq_file *m, void *data)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_file *file;
 
+	if (HAS_SLPC(dev))
+		dev_priv->rps.cur_freq = (I915_READ(GEN6_RPNSWREQ) >> 23);
+
 	seq_printf(m, "RPS enabled? %d\n", dev_priv->rps.enabled);
 	seq_printf(m, "GPU busy? %d\n", dev_priv->mm.busy);
 	seq_printf(m, "CPU waiting? %d\n", count_irq_waiters(dev_priv));
diff --git a/drivers/gpu/drm/i915/i915_sysfs.c b/drivers/gpu/drm/i915/i915_sysfs.c
index c6188dd..f69b949 100644
--- a/drivers/gpu/drm/i915/i915_sysfs.c
+++ b/drivers/gpu/drm/i915/i915_sysfs.c
@@ -318,6 +318,8 @@ static ssize_t gt_cur_freq_mhz_show(struct device *kdev,
 	intel_runtime_pm_get(dev_priv);
 
 	mutex_lock(&dev_priv->rps.hw_lock);
+	if (HAS_SLPC(dev))
+		dev_priv->rps.cur_freq = (I915_READ(GEN6_RPNSWREQ) >> 23);
 	ret = intel_gpu_freq(dev_priv, dev_priv->rps.cur_freq);
 	mutex_unlock(&dev_priv->rps.hw_lock);
 
-- 
1.9.1

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