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drm/i915: Add cdclk change support for chv

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Looks like the Punit is supposed to support the 400MHz cdclk directly on
chv, so we don't need the vlv tricks.

FIXME: Punit doesn't seem ready for this yet on current hw

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-06-28 02:03:57 +03:00 committed by Daniel Vetter
parent 06ffc7789e
commit 383c5a6a46
2 changed files with 52 additions and 2 deletions
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4
drivers/gpu/drm/i915/i915_reg.h
View file

@ -497,6 +497,10 @@
#define BUNIT_REG_BISOC 0x11
#define PUNIT_REG_DSPFREQ 0x36
#define DSPFREQSTAT_SHIFT_CHV 24
#define DSPFREQSTAT_MASK_CHV (0x1f << DSPFREQSTAT_SHIFT_CHV)
#define DSPFREQGUAR_SHIFT_CHV 8
#define DSPFREQGUAR_MASK_CHV (0x1f << DSPFREQGUAR_SHIFT_CHV)
#define DSPFREQSTAT_SHIFT 30
#define DSPFREQSTAT_MASK (0x3 << DSPFREQSTAT_SHIFT)
#define DSPFREQGUAR_SHIFT 14

50
drivers/gpu/drm/i915/intel_display.c
View file

@ -4501,6 +4501,47 @@ static void valleyview_set_cdclk(struct drm_device *dev, int cdclk)
vlv_update_cdclk(dev);
}
static void cherryview_set_cdclk(struct drm_device *dev, int cdclk)
{
struct drm_i915_private *dev_priv = dev->dev_private;
u32 val, cmd;
WARN_ON(dev_priv->display.get_display_clock_speed(dev) != dev_priv->vlv_cdclk_freq);
switch (cdclk) {
case 400000:
cmd = 3;
break;
case 333333:
case 320000:
cmd = 2;
break;
case 266667:
cmd = 1;
break;
case 200000:
cmd = 0;
break;
default:
WARN_ON(1);
return;
}
mutex_lock(&dev_priv->rps.hw_lock);
val = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ);
val &= ~DSPFREQGUAR_MASK_CHV;
val |= (cmd << DSPFREQGUAR_SHIFT_CHV);
vlv_punit_write(dev_priv, PUNIT_REG_DSPFREQ, val);
if (wait_for((vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) &
DSPFREQSTAT_MASK_CHV) == (cmd << DSPFREQSTAT_SHIFT_CHV),
50)) {
DRM_ERROR("timed out waiting for CDclk change\n");
}
mutex_unlock(&dev_priv->rps.hw_lock);
vlv_update_cdclk(dev);
}
static int valleyview_calc_cdclk(struct drm_i915_private *dev_priv,
int max_pixclk)
{
@ -4569,8 +4610,13 @@ static void valleyview_modeset_global_resources(struct drm_device *dev)
int max_pixclk = intel_mode_max_pixclk(dev_priv);
int req_cdclk = valleyview_calc_cdclk(dev_priv, max_pixclk);
if (req_cdclk != dev_priv->vlv_cdclk_freq)
valleyview_set_cdclk(dev, req_cdclk);
if (req_cdclk != dev_priv->vlv_cdclk_freq) {
if (IS_CHERRYVIEW(dev))
cherryview_set_cdclk(dev, req_cdclk);
else
valleyview_set_cdclk(dev, req_cdclk);
}
modeset_update_crtc_power_domains(dev);
}