drm/i915: report correct render clock frequencies on SNB

Fix up the debug file to report the right frequencies.  On SNB, we program
the PCU with a frequency ratio, which is multiplied by 100MHz on the CPU
side.  But GFX only runs at half that, so report it as such to avoid
confusion.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Keith Packard <keithp@keithp.com>

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 09e0327..87c8e29 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -892,7 +892,7 @@ static int i915_cur_delayinfo(struct seq_file *m, void *unused)
                seq_printf(m, "Render p-state limit: %d\n",
                           rp_state_limits & 0xff);
                seq_printf(m, "CAGF: %dMHz\n", ((rpstat & GEN6_CAGF_MASK) >>
-                                               GEN6_CAGF_SHIFT) * 100);
+                                               GEN6_CAGF_SHIFT) * 50);
                seq_printf(m, "RP CUR UP EI: %dus\n", rpupei &
                           GEN6_CURICONT_MASK);
                seq_printf(m, "RP CUR UP: %dus\n", rpcurup &
@@ -908,15 +908,15 @@ static int i915_cur_delayinfo(struct seq_file *m, void *unused)
 
                max_freq = (rp_state_cap & 0xff0000) >> 16;
                seq_printf(m, "Lowest (RPN) frequency: %dMHz\n",
-                          max_freq * 100);
+                          max_freq * 50);
 
                max_freq = (rp_state_cap & 0xff00) >> 8;
                seq_printf(m, "Nominal (RP1) frequency: %dMHz\n",
-                          max_freq * 100);
+                          max_freq * 50);
 
                max_freq = rp_state_cap & 0xff;
                seq_printf(m, "Max non-overclocked (RP0) frequency: %dMHz\n",
-                          max_freq * 100);
+                          max_freq * 50);
 
                __gen6_gt_force_wake_put(dev_priv);
        } else {

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 49c0723..432fc04 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6930,7 +6930,7 @@ void gen6_enable_rps(struct drm_i915_private *dev_priv)
                DRM_ERROR("timeout waiting for pcode mailbox to finish\n");
        if (pcu_mbox & (1<<31)) { /* OC supported */
                max_freq = pcu_mbox & 0xff;
-               DRM_DEBUG_DRIVER("overclocking supported, adjusting frequency max to %dMHz\n", pcu_mbox * 100);
+               DRM_DEBUG_DRIVER("overclocking supported, adjusting frequency max to %dMHz\n", pcu_mbox * 50);
        }
 
        /* In units of 100MHz */