drm/i915: Reorganize the overclock code

The existing code (which I changed last) was very convoluted. I believe
it was attempting to skip the overclock portion if the previous pcode
write failed. When I last touched the code, I was preserving this
behavior. There is some benefit to doing it that way in that if the
first pcode access fails, the later is likely invalid.

Having a bit more confidence in my understanding of how things work, I
now feel it's better to have clear, readable, code than to try to skip
over this one operation in an unusual case.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 39f3238..dd3a121 100644 (file)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3326,7 +3326,7 @@ static void gen6_enable_rps(struct drm_device *dev)
        struct intel_ring_buffer *ring;
        u32 rp_state_cap, hw_max, hw_min;
        u32 gt_perf_status;
-       u32 rc6vids, pcu_mbox, rc6_mask = 0;
+       u32 rc6vids, pcu_mbox = 0, rc6_mask = 0;
        u32 gtfifodbg;
        int rc6_mode;
        int i, ret;
@@ -3414,17 +3414,15 @@ static void gen6_enable_rps(struct drm_device *dev)
        I915_WRITE(GEN6_RP_IDLE_HYSTERSIS, 10);
 
        ret = sandybridge_pcode_write(dev_priv, GEN6_PCODE_WRITE_MIN_FREQ_TABLE, 0);
-       if (!ret) {
-               pcu_mbox = 0;
-               ret = sandybridge_pcode_read(dev_priv, GEN6_READ_OC_PARAMS, &pcu_mbox);
-               if (!ret && (pcu_mbox & (1<<31))) { /* OC supported */
-                       DRM_DEBUG_DRIVER("Overclocking supported. Max: %dMHz, Overclock max: %dMHz\n",
-                                        (dev_priv->rps.max_delay & 0xff) * 50,
-                                        (pcu_mbox & 0xff) * 50);
-                       dev_priv->rps.hw_max = pcu_mbox & 0xff;
-               }
-       } else {
+       if (ret)
                DRM_DEBUG_DRIVER("Failed to set the min frequency\n");
+
+       ret = sandybridge_pcode_read(dev_priv, GEN6_READ_OC_PARAMS, &pcu_mbox);
+       if (!ret && (pcu_mbox & (1<<31))) { /* OC supported */
+               DRM_DEBUG_DRIVER("Overclocking supported. Max: %dMHz, Overclock max: %dMHz\n",
+                                (dev_priv->rps.max_delay & 0xff) * 50,
+                                (pcu_mbox & 0xff) * 50);
+               dev_priv->rps.hw_max = pcu_mbox & 0xff;
        }
 
        dev_priv->rps.power = HIGH_POWER; /* force a reset */