drm/i915/skl: Updated the i915_ring_freq_table debugfs function

Updated the i915_ring_freq_table debugfs function to support the read
of ring frequency table, through Punit interface, for SKL also.

Issue: VIZ-5144
Signed-off-by: Akash Goel <akash.goel@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 73aaea2..27f0a0d 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1782,6 +1782,7 @@ static int i915_ring_freq_table(struct seq_file *m, void *unused)
        struct drm_i915_private *dev_priv = dev->dev_private;
        int ret = 0;
        int gpu_freq, ia_freq;
+       unsigned int max_gpu_freq, min_gpu_freq;
 
        if (!(IS_GEN6(dev) || IS_GEN7(dev))) {
                seq_puts(m, "unsupported on this chipset\n");
@@ -1796,17 +1797,27 @@ static int i915_ring_freq_table(struct seq_file *m, void *unused)
        if (ret)
                goto out;
 
+       if (IS_SKYLAKE(dev)) {
+               /* Convert GT frequency to 50 HZ units */
+               min_gpu_freq =
+                       dev_priv->rps.min_freq_softlimit / GEN9_FREQ_SCALER;
+               max_gpu_freq =
+                       dev_priv->rps.max_freq_softlimit / GEN9_FREQ_SCALER;
+       } else {
+               min_gpu_freq = dev_priv->rps.min_freq_softlimit;
+               max_gpu_freq = dev_priv->rps.max_freq_softlimit;
+       }
+
        seq_puts(m, "GPU freq (MHz)\tEffective CPU freq (MHz)\tEffective Ring freq (MHz)\n");
 
-       for (gpu_freq = dev_priv->rps.min_freq_softlimit;
-            gpu_freq <= dev_priv->rps.max_freq_softlimit;
-            gpu_freq++) {
+       for (gpu_freq = min_gpu_freq; gpu_freq <= max_gpu_freq; gpu_freq++) {
                ia_freq = gpu_freq;
                sandybridge_pcode_read(dev_priv,
                                       GEN6_PCODE_READ_MIN_FREQ_TABLE,
                                       &ia_freq);
                seq_printf(m, "%d\t\t%d\t\t\t\t%d\n",
-                          intel_gpu_freq(dev_priv, gpu_freq),
+                          intel_gpu_freq(dev_priv, (gpu_freq *
+                               (IS_SKYLAKE(dev) ? GEN9_FREQ_SCALER : 1))),
                           ((ia_freq >> 0) & 0xff) * 100,
                           ((ia_freq >> 8) & 0xff) * 100);
        }