drm/i915: VLV GPU frequency to opcode functions
authorJesse Barnes <jbarnes@virtuousgeek.org>
Wed, 17 Apr 2013 22:54:57 +0000 (15:54 -0700)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Thu, 18 Apr 2013 07:58:30 +0000 (09:58 +0200)
When requesting frequency changes or querying status from the Punit, we
need to use an opcode that corresponds to the frequency, taking into
account the memory frequency.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Acked-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
drivers/gpu/drm/i915/i915_drv.h
drivers/gpu/drm/i915/intel_pm.c

index 15d0a3a..abb0655 100644 (file)
@@ -1887,6 +1887,8 @@ int sandybridge_pcode_read(struct drm_i915_private *dev_priv, u8 mbox, u32 *val)
 int sandybridge_pcode_write(struct drm_i915_private *dev_priv, u8 mbox, u32 val);
 int valleyview_punit_read(struct drm_i915_private *dev_priv, u8 addr, u32 *val);
 int valleyview_punit_write(struct drm_i915_private *dev_priv, u8 addr, u32 val);
+int vlv_gpu_freq(int ddr_freq, int val);
+int vlv_freq_opcode(int ddr_freq, int val);
 
 #define __i915_read(x, y) \
        u##x i915_read##x(struct drm_i915_private *dev_priv, u32 reg);
index 413877d..f802368 100644 (file)
@@ -4620,3 +4620,59 @@ int valleyview_punit_write(struct drm_i915_private *dev_priv, u8 addr, u32 val)
 {
        return vlv_punit_rw(dev_priv, PUNIT_OPCODE_REG_WRITE, addr, &val);
 }
+
+int vlv_gpu_freq(int ddr_freq, int val)
+{
+       int mult, base;
+
+       switch (ddr_freq) {
+       case 800:
+               mult = 20;
+               base = 120;
+               break;
+       case 1066:
+               mult = 22;
+               base = 133;
+               break;
+       case 1333:
+               mult = 21;
+               base = 125;
+               break;
+       default:
+               return -1;
+       }
+
+       return ((val - 0xbd) * mult) + base;
+}
+
+int vlv_freq_opcode(int ddr_freq, int val)
+{
+       int mult, base;
+
+       switch (ddr_freq) {
+       case 800:
+               mult = 20;
+               base = 120;
+               break;
+       case 1066:
+               mult = 22;
+               base = 133;
+               break;
+       case 1333:
+               mult = 21;
+               base = 125;
+               break;
+       default:
+               return -1;
+       }
+
+       val /= mult;
+       val -= base / mult;
+       val += 0xbd;
+
+       if (val > 0xea)
+               val = 0xea;
+
+       return val;
+}
+