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drm/nva3/pm: idle graphics engine before changing clocks 

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2011-06-18 16:28:00 +10:00
parent 78e2933d07
commit d0f67a48f4
1 changed files with 40 additions and 0 deletions
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40
drivers/gpu/drm/nouveau/nva3_pm.c
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@ -264,10 +264,40 @@ out:
return info;
}
static bool
nva3_pm_grcp_idle(void *data)
{
struct drm_device *dev = data;
if (!(nv_rd32(dev, 0x400304) & 0x00000001))
return true;
if (nv_rd32(dev, 0x400308) == 0x0050001c)
return true;
return false;
}
void
nva3_pm_clocks_set(struct drm_device *dev, void *pre_state)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nva3_pm_state *info = pre_state;
unsigned long flags;
/* prevent any new grctx switches from starting */
spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
nv_wr32(dev, 0x400324, 0x00000000);
nv_wr32(dev, 0x400328, 0x0050001c); /* wait flag 0x1c */
/* wait for any pending grctx switches to complete */
if (!nv_wait_cb(dev, nva3_pm_grcp_idle, dev)) {
NV_ERROR(dev, "pm: ctxprog didn't go idle\n");
goto cleanup;
}
/* freeze PFIFO */
nv_mask(dev, 0x002504, 0x00000001, 0x00000001);
if (!nv_wait(dev, 0x002504, 0x00000010, 0x00000010)) {
NV_ERROR(dev, "pm: fifo didn't go idle\n");
goto cleanup;
}
prog_pll(dev, 0x00, 0x004200, &info->nclk);
prog_pll(dev, 0x01, 0x004220, &info->sclk);
@ -285,5 +315,15 @@ nva3_pm_clocks_set(struct drm_device *dev, void *pre_state)
nv_wr32(dev, 0x1002dc, 0);
nv_wr32(dev, 0x100210, 0x80000000);
cleanup:
/* unfreeze PFIFO */
nv_mask(dev, 0x002504, 0x00000001, 0x00000000);
/* restore ctxprog to normal */
nv_wr32(dev, 0x400324, 0x00000000);
nv_wr32(dev, 0x400328, 0x0070009c); /* set flag 0x1c */
/* unblock it if necessary */
if (nv_rd32(dev, 0x400308) == 0x0050001c)
nv_mask(dev, 0x400824, 0x10000000, 0x10000000);
spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
kfree(info);
}