drm/nva3/pm: idle graphics engine before changing clocks (d0f67a48) · Commits · github.com / kvm-riscv / linux

drivers/gpu/drm/nouveau/nva3_pm.c

+40 −0

Original line number	Diff line number	Diff line
		@@ -264,10 +264,40 @@ nva3_pm_clocks_pre(struct drm_device dev, struct nouveau_pm_level perflvl)
		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);
		}