drivers/gpu/drm/nouveau/nva3_pm.c - pub/scm/linux/kernel/git/ak/linux-mce-2.6 - Git at Google

 /*
  * Copyright 2010 Red Hat Inc.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  * OTHER DEALINGS IN THE SOFTWARE.
  *
  * Authors: Ben Skeggs
  */

 #include "drmP.h"
 #include "nouveau_drv.h"
 #include "nouveau_bios.h"
 #include "nouveau_pm.h"

 static u32 read_clk(struct drm_device *, int, bool);
 static u32 read_pll(struct drm_device *, int, u32);

 static u32
 read_vco(struct drm_device *dev, int clk)
 {
 	u32 sctl = nv_rd32(dev, 0x4120 + (clk * 4));
 	if ((sctl & 0x00000030) != 0x00000030)
 		return read_pll(dev, 0x41, 0x00e820);
 	return read_pll(dev, 0x42, 0x00e8a0);
 }

 static u32
 read_clk(struct drm_device *dev, int clk, bool ignore_en)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	u32 sctl, sdiv, sclk;

 	/* refclk for the 0xe8xx plls is a fixed frequency */
 	if (clk >= 0x40) {
 		if (dev_priv->chipset == 0xaf) {
 			/* no joke.. seriously.. sigh.. */
 			return nv_rd32(dev, 0x00471c) * 1000;
 		}

 		return dev_priv->crystal;
 	}

 	sctl = nv_rd32(dev, 0x4120 + (clk * 4));
 	if (!ignore_en && !(sctl & 0x00000100))
 		return 0;

 	switch (sctl & 0x00003000) {
 	case 0x00000000:
 		return dev_priv->crystal;
 	case 0x00002000:
 		if (sctl & 0x00000040)
 			return 108000;
 		return 100000;
 	case 0x00003000:
 		sclk = read_vco(dev, clk);
 		sdiv = ((sctl & 0x003f0000) >> 16) + 2;
 		return (sclk * 2) / sdiv;
 	default:
 		return 0;
 	}
 }

 static u32
 read_pll(struct drm_device *dev, int clk, u32 pll)
 {
 	u32 ctrl = nv_rd32(dev, pll + 0);
 	u32 sclk = 0, P = 1, N = 1, M = 1;

 	if (!(ctrl & 0x00000008)) {
 		if (ctrl & 0x00000001) {
 			u32 coef = nv_rd32(dev, pll + 4);
 			M = (coef & 0x000000ff) >> 0;
 			N = (coef & 0x0000ff00) >> 8;
 			P = (coef & 0x003f0000) >> 16;

 			/* no post-divider on these.. */
 			if ((pll & 0x00ff00) == 0x00e800)
 				P = 1;

 			sclk = read_clk(dev, 0x00 + clk, false);
 		}
 	} else {
 		sclk = read_clk(dev, 0x10 + clk, false);
 	}

 	return sclk * N / (M * P);
 }

 struct creg {
 	u32 clk;
 	u32 pll;
 };

 static int
 calc_clk(struct drm_device *dev, int clk, u32 pll, u32 khz, struct creg *reg)
 {
 	struct pll_lims limits;
 	u32 oclk, sclk, sdiv;
 	int P, N, M, diff;
 	int ret;

 	reg->pll = 0;
 	reg->clk = 0;
 	if (!khz) {
 		NV_DEBUG(dev, "no clock for 0x%04x/0x%02x\n", pll, clk);
 		return 0;
 	}

 	switch (khz) {
 	case 27000:
 		reg->clk = 0x00000100;
 		return khz;
 	case 100000:
 		reg->clk = 0x00002100;
 		return khz;
 	case 108000:
 		reg->clk = 0x00002140;
 		return khz;
 	default:
 		sclk = read_vco(dev, clk);
 		sdiv = min((sclk * 2) / (khz - 2999), (u32)65);
 		/* if the clock has a PLL attached, and we can get a within
 		 * [-2, 3) MHz of a divider, we'll disable the PLL and use
 		 * the divider instead.
 		 *
 		 * divider can go as low as 2, limited here because NVIDIA
 		 * and the VBIOS on my NVA8 seem to prefer using the PLL
 		 * for 810MHz - is there a good reason?
 		 */
 		if (sdiv > 4) {
 			oclk = (sclk * 2) / sdiv;
 			diff = khz - oclk;
 			if (!pll || (diff >= -2000 && diff < 3000)) {
 				reg->clk = (((sdiv - 2) << 16) | 0x00003100);
 				return oclk;
 			}
 		}

 		if (!pll) {
 			NV_ERROR(dev, "bad freq %02x: %d %d\n", clk, khz, sclk);
 			return -ERANGE;
 		}

 		break;
 	}

 	ret = get_pll_limits(dev, pll, &limits);
 	if (ret)
 		return ret;

 	limits.refclk = read_clk(dev, clk - 0x10, true);
 	if (!limits.refclk)
 		return -EINVAL;

 	ret = nva3_calc_pll(dev, &limits, khz, &N, NULL, &M, &P);
 	if (ret >= 0) {
 		reg->clk = nv_rd32(dev, 0x4120 + (clk * 4));
 		reg->pll = (P << 16) | (N << 8) | M;
 	}
 	return ret;
 }

 static void
 prog_pll(struct drm_device *dev, int clk, u32 pll, struct creg *reg)
 {
 	const u32 src0 = 0x004120 + (clk * 4);
 	const u32 src1 = 0x004160 + (clk * 4);
 	const u32 ctrl = pll + 0;
 	const u32 coef = pll + 4;
 	u32 cntl;

 	if (!reg->clk && !reg->pll) {
 		NV_DEBUG(dev, "no clock for %02x\n", clk);
 		return;
 	}

 	cntl = nv_rd32(dev, ctrl) & 0xfffffff2;
 	if (reg->pll) {
 		nv_mask(dev, src0, 0x00000101, 0x00000101);
 		nv_wr32(dev, coef, reg->pll);
 		nv_wr32(dev, ctrl, cntl | 0x00000015);
 		nv_mask(dev, src1, 0x00000100, 0x00000000);
 		nv_mask(dev, src1, 0x00000001, 0x00000000);
 	} else {
 		nv_mask(dev, src1, 0x003f3141, 0x00000101 | reg->clk);
 		nv_wr32(dev, ctrl, cntl | 0x0000001d);
 		nv_mask(dev, ctrl, 0x00000001, 0x00000000);
 		nv_mask(dev, src0, 0x00000100, 0x00000000);
 		nv_mask(dev, src0, 0x00000001, 0x00000000);
 	}
 }

 static void
 prog_clk(struct drm_device *dev, int clk, struct creg *reg)
 {
 	if (!reg->clk) {
 		NV_DEBUG(dev, "no clock for %02x\n", clk);
 		return;
 	}

 	nv_mask(dev, 0x004120 + (clk * 4), 0x003f3141, 0x00000101 | reg->clk);
 }

 int
 nva3_pm_clocks_get(struct drm_device *dev, struct nouveau_pm_level *perflvl)
 {
 	perflvl->core   = read_pll(dev, 0x00, 0x4200);
 	perflvl->shader = read_pll(dev, 0x01, 0x4220);
 	perflvl->memory = read_pll(dev, 0x02, 0x4000);
 	perflvl->unka0  = read_clk(dev, 0x20, false);
 	perflvl->vdec   = read_clk(dev, 0x21, false);
 	perflvl->daemon = read_clk(dev, 0x25, false);
 	perflvl->copy   = perflvl->core;
 	return 0;
 }

 struct nva3_pm_state {
 	struct creg nclk;
 	struct creg sclk;
 	struct creg mclk;
 	struct creg vdec;
 	struct creg unka0;
 };

 void *
 nva3_pm_clocks_pre(struct drm_device *dev, struct nouveau_pm_level *perflvl)
 {
 	struct nva3_pm_state *info;
 	int ret;

 	info = kzalloc(sizeof(*info), GFP_KERNEL);
 	if (!info)
 		return ERR_PTR(-ENOMEM);

 	ret = calc_clk(dev, 0x10, 0x4200, perflvl->core, &info->nclk);
 	if (ret < 0)
 		goto out;

 	ret = calc_clk(dev, 0x11, 0x4220, perflvl->shader, &info->sclk);
 	if (ret < 0)
 		goto out;

 	ret = calc_clk(dev, 0x12, 0x4000, perflvl->memory, &info->mclk);
 	if (ret < 0)
 		goto out;

 	ret = calc_clk(dev, 0x20, 0x0000, perflvl->unka0, &info->unka0);
 	if (ret < 0)
 		goto out;

 	ret = calc_clk(dev, 0x21, 0x0000, perflvl->vdec, &info->vdec);
 	if (ret < 0)
 		goto out;

 out:
 	if (ret < 0) {
 		kfree(info);
 		info = ERR_PTR(ret);
 	}
 	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);
 	prog_clk(dev, 0x20, &info->unka0);
 	prog_clk(dev, 0x21, &info->vdec);

 	if (info->mclk.clk || info->mclk.pll) {
 		nv_wr32(dev, 0x100210, 0);
 		nv_wr32(dev, 0x1002dc, 1);
 		nv_wr32(dev, 0x004018, 0x00001000);
 		prog_pll(dev, 0x02, 0x004000, &info->mclk);
 		if (nv_rd32(dev, 0x4000) & 0x00000008)
 			nv_wr32(dev, 0x004018, 0x1000d000);
 		else
 			nv_wr32(dev, 0x004018, 0x10005000);
 		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);
 }
	/*
	* Copyright 2010 Red Hat Inc.
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	* OTHER DEALINGS IN THE SOFTWARE.
	*
	* Authors: Ben Skeggs
	*/

	#include "drmP.h"
	#include "nouveau_drv.h"
	#include "nouveau_bios.h"
	#include "nouveau_pm.h"

	static u32 read_clk(struct drm_device *, int, bool);
	static u32 read_pll(struct drm_device *, int, u32);

	static u32
	read_vco(struct drm_device *dev, int clk)
	{
	u32 sctl = nv_rd32(dev, 0x4120 + (clk * 4));
	if ((sctl & 0x00000030) != 0x00000030)
	return read_pll(dev, 0x41, 0x00e820);
	return read_pll(dev, 0x42, 0x00e8a0);
	}

	static u32
	read_clk(struct drm_device *dev, int clk, bool ignore_en)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	u32 sctl, sdiv, sclk;

	/* refclk for the 0xe8xx plls is a fixed frequency */
	if (clk >= 0x40) {
	if (dev_priv->chipset == 0xaf) {
	/* no joke.. seriously.. sigh.. */
	return nv_rd32(dev, 0x00471c) * 1000;
	}

	return dev_priv->crystal;
	}

	sctl = nv_rd32(dev, 0x4120 + (clk * 4));
	if (!ignore_en && !(sctl & 0x00000100))
	return 0;

	switch (sctl & 0x00003000) {
	case 0x00000000:
	return dev_priv->crystal;
	case 0x00002000:
	if (sctl & 0x00000040)
	return 108000;
	return 100000;
	case 0x00003000:
	sclk = read_vco(dev, clk);
	sdiv = ((sctl & 0x003f0000) >> 16) + 2;
	return (sclk * 2) / sdiv;
	default:
	return 0;
	}
	}

	static u32
	read_pll(struct drm_device *dev, int clk, u32 pll)
	{
	u32 ctrl = nv_rd32(dev, pll + 0);
	u32 sclk = 0, P = 1, N = 1, M = 1;

	if (!(ctrl & 0x00000008)) {
	if (ctrl & 0x00000001) {
	u32 coef = nv_rd32(dev, pll + 4);
	M = (coef & 0x000000ff) >> 0;
	N = (coef & 0x0000ff00) >> 8;
	P = (coef & 0x003f0000) >> 16;

	/* no post-divider on these.. */
	if ((pll & 0x00ff00) == 0x00e800)
	P = 1;

	sclk = read_clk(dev, 0x00 + clk, false);
	}
	} else {
	sclk = read_clk(dev, 0x10 + clk, false);
	}

	return sclk * N / (M * P);
	}

	struct creg {
	u32 clk;
	u32 pll;
	};

	static int
	calc_clk(struct drm_device dev, int clk, u32 pll, u32 khz, struct creg reg)
	{
	struct pll_lims limits;
	u32 oclk, sclk, sdiv;
	int P, N, M, diff;
	int ret;

	reg->pll = 0;
	reg->clk = 0;
	if (!khz) {
	NV_DEBUG(dev, "no clock for 0x%04x/0x%02x\n", pll, clk);
	return 0;
	}

	switch (khz) {
	case 27000:
	reg->clk = 0x00000100;
	return khz;
	case 100000:
	reg->clk = 0x00002100;
	return khz;
	case 108000:
	reg->clk = 0x00002140;
	return khz;
	default:
	sclk = read_vco(dev, clk);
	sdiv = min((sclk * 2) / (khz - 2999), (u32)65);
	/* if the clock has a PLL attached, and we can get a within
	* [-2, 3) MHz of a divider, we'll disable the PLL and use
	* the divider instead.
	*
	* divider can go as low as 2, limited here because NVIDIA
	* and the VBIOS on my NVA8 seem to prefer using the PLL
	* for 810MHz - is there a good reason?
	*/
	if (sdiv > 4) {
	oclk = (sclk * 2) / sdiv;
	diff = khz - oclk;
	if (!pll \|\| (diff >= -2000 && diff < 3000)) {
	reg->clk = (((sdiv - 2) << 16) \| 0x00003100);
	return oclk;
	}
	}

	if (!pll) {
	NV_ERROR(dev, "bad freq %02x: %d %d\n", clk, khz, sclk);
	return -ERANGE;
	}

	break;
	}

	ret = get_pll_limits(dev, pll, &limits);
	if (ret)
	return ret;

	limits.refclk = read_clk(dev, clk - 0x10, true);
	if (!limits.refclk)
	return -EINVAL;

	ret = nva3_calc_pll(dev, &limits, khz, &N, NULL, &M, &P);
	if (ret >= 0) {
	reg->clk = nv_rd32(dev, 0x4120 + (clk * 4));
	reg->pll = (P << 16) \| (N << 8) \| M;
	}
	return ret;
	}

	static void
	prog_pll(struct drm_device dev, int clk, u32 pll, struct creg reg)
	{
	const u32 src0 = 0x004120 + (clk * 4);
	const u32 src1 = 0x004160 + (clk * 4);
	const u32 ctrl = pll + 0;
	const u32 coef = pll + 4;
	u32 cntl;

	if (!reg->clk && !reg->pll) {
	NV_DEBUG(dev, "no clock for %02x\n", clk);
	return;
	}

	cntl = nv_rd32(dev, ctrl) & 0xfffffff2;
	if (reg->pll) {
	nv_mask(dev, src0, 0x00000101, 0x00000101);
	nv_wr32(dev, coef, reg->pll);
	nv_wr32(dev, ctrl, cntl \| 0x00000015);
	nv_mask(dev, src1, 0x00000100, 0x00000000);
	nv_mask(dev, src1, 0x00000001, 0x00000000);
	} else {
	nv_mask(dev, src1, 0x003f3141, 0x00000101 \| reg->clk);
	nv_wr32(dev, ctrl, cntl \| 0x0000001d);
	nv_mask(dev, ctrl, 0x00000001, 0x00000000);
	nv_mask(dev, src0, 0x00000100, 0x00000000);
	nv_mask(dev, src0, 0x00000001, 0x00000000);
	}
	}

	static void
	prog_clk(struct drm_device dev, int clk, struct creg reg)
	{
	if (!reg->clk) {
	NV_DEBUG(dev, "no clock for %02x\n", clk);
	return;
	}

	nv_mask(dev, 0x004120 + (clk * 4), 0x003f3141, 0x00000101 \| reg->clk);
	}

	int
	nva3_pm_clocks_get(struct drm_device dev, struct nouveau_pm_level perflvl)
	{
	perflvl->core = read_pll(dev, 0x00, 0x4200);
	perflvl->shader = read_pll(dev, 0x01, 0x4220);
	perflvl->memory = read_pll(dev, 0x02, 0x4000);
	perflvl->unka0 = read_clk(dev, 0x20, false);
	perflvl->vdec = read_clk(dev, 0x21, false);
	perflvl->daemon = read_clk(dev, 0x25, false);
	perflvl->copy = perflvl->core;
	return 0;
	}

	struct nva3_pm_state {
	struct creg nclk;
	struct creg sclk;
	struct creg mclk;
	struct creg vdec;
	struct creg unka0;
	};

	void *
	nva3_pm_clocks_pre(struct drm_device dev, struct nouveau_pm_level perflvl)
	{
	struct nva3_pm_state *info;
	int ret;

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info)
	return ERR_PTR(-ENOMEM);

	ret = calc_clk(dev, 0x10, 0x4200, perflvl->core, &info->nclk);
	if (ret < 0)
	goto out;

	ret = calc_clk(dev, 0x11, 0x4220, perflvl->shader, &info->sclk);
	if (ret < 0)
	goto out;

	ret = calc_clk(dev, 0x12, 0x4000, perflvl->memory, &info->mclk);
	if (ret < 0)
	goto out;

	ret = calc_clk(dev, 0x20, 0x0000, perflvl->unka0, &info->unka0);
	if (ret < 0)
	goto out;

	ret = calc_clk(dev, 0x21, 0x0000, perflvl->vdec, &info->vdec);
	if (ret < 0)
	goto out;

	out:
	if (ret < 0) {
	kfree(info);
	info = ERR_PTR(ret);
	}
	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);
	prog_clk(dev, 0x20, &info->unka0);
	prog_clk(dev, 0x21, &info->vdec);

	if (info->mclk.clk \|\| info->mclk.pll) {
	nv_wr32(dev, 0x100210, 0);
	nv_wr32(dev, 0x1002dc, 1);
	nv_wr32(dev, 0x004018, 0x00001000);
	prog_pll(dev, 0x02, 0x004000, &info->mclk);
	if (nv_rd32(dev, 0x4000) & 0x00000008)
	nv_wr32(dev, 0x004018, 0x1000d000);
	else
	nv_wr32(dev, 0x004018, 0x10005000);
	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);
	}