drivers/gpu/drm/nouveau/nv40_pm.c - pub/scm/linux/kernel/git/hpa/linux-extable - Git at Google

 /*
  * Copyright 2011 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"
 #include "nouveau_hw.h"

 #define min2(a,b) ((a) < (b) ? (a) : (b))

 static u32
 read_pll_1(struct drm_device *dev, u32 reg)
 {
 	u32 ctrl = nv_rd32(dev, reg + 0x00);
 	int P = (ctrl & 0x00070000) >> 16;
 	int N = (ctrl & 0x0000ff00) >> 8;
 	int M = (ctrl & 0x000000ff) >> 0;
 	u32 ref = 27000, clk = 0;

 	if (ctrl & 0x80000000)
 		clk = ref * N / M;

 	return clk >> P;
 }

 static u32
 read_pll_2(struct drm_device *dev, u32 reg)
 {
 	u32 ctrl = nv_rd32(dev, reg + 0x00);
 	u32 coef = nv_rd32(dev, reg + 0x04);
 	int N2 = (coef & 0xff000000) >> 24;
 	int M2 = (coef & 0x00ff0000) >> 16;
 	int N1 = (coef & 0x0000ff00) >> 8;
 	int M1 = (coef & 0x000000ff) >> 0;
 	int P = (ctrl & 0x00070000) >> 16;
 	u32 ref = 27000, clk = 0;

 	if ((ctrl & 0x80000000) && M1) {
 		clk = ref * N1 / M1;
 		if ((ctrl & 0x40000100) == 0x40000000) {
 			if (M2)
 				clk = clk * N2 / M2;
 			else
 				clk = 0;
 		}
 	}

 	return clk >> P;
 }

 static u32
 read_clk(struct drm_device *dev, u32 src)
 {
 	switch (src) {
 	case 3:
 		return read_pll_2(dev, 0x004000);
 	case 2:
 		return read_pll_1(dev, 0x004008);
 	default:
 		break;
 	}

 	return 0;
 }

 int
 nv40_pm_clocks_get(struct drm_device *dev, struct nouveau_pm_level *perflvl)
 {
 	u32 ctrl = nv_rd32(dev, 0x00c040);

 	perflvl->core   = read_clk(dev, (ctrl & 0x00000003) >> 0);
 	perflvl->shader = read_clk(dev, (ctrl & 0x00000030) >> 4);
 	perflvl->memory = read_pll_2(dev, 0x4020);
 	return 0;
 }

 struct nv40_pm_state {
 	u32 ctrl;
 	u32 npll_ctrl;
 	u32 npll_coef;
 	u32 spll;
 	u32 mpll_ctrl;
 	u32 mpll_coef;
 };

 static int
 nv40_calc_pll(struct drm_device *dev, u32 reg, struct pll_lims *pll,
 	      u32 clk, int *N1, int *M1, int *N2, int *M2, int *log2P)
 {
 	struct nouveau_pll_vals coef;
 	int ret;

 	ret = get_pll_limits(dev, reg, pll);
 	if (ret)
 		return ret;

 	if (clk < pll->vco1.maxfreq)
 		pll->vco2.maxfreq = 0;

 	ret = nouveau_calc_pll_mnp(dev, pll, clk, &coef);
 	if (ret == 0)
 		return -ERANGE;

 	*N1 = coef.N1;
 	*M1 = coef.M1;
 	if (N2 && M2) {
 		if (pll->vco2.maxfreq) {
 			*N2 = coef.N2;
 			*M2 = coef.M2;
 		} else {
 			*N2 = 1;
 			*M2 = 1;
 		}
 	}
 	*log2P = coef.log2P;
 	return 0;
 }

 void *
 nv40_pm_clocks_pre(struct drm_device *dev, struct nouveau_pm_level *perflvl)
 {
 	struct nv40_pm_state *info;
 	struct pll_lims pll;
 	int N1, N2, M1, M2, log2P;
 	int ret;

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

 	/* core/geometric clock */
 	ret = nv40_calc_pll(dev, 0x004000, &pll, perflvl->core,
 			    &N1, &M1, &N2, &M2, &log2P);
 	if (ret < 0)
 		goto out;

 	if (N2 == M2) {
 		info->npll_ctrl = 0x80000100 | (log2P << 16);
 		info->npll_coef = (N1 << 8) | M1;
 	} else {
 		info->npll_ctrl = 0xc0000000 | (log2P << 16);
 		info->npll_coef = (N2 << 24) | (M2 << 16) | (N1 << 8) | M1;
 	}

 	/* use the second PLL for shader/rop clock, if it differs from core */
 	if (perflvl->shader && perflvl->shader != perflvl->core) {
 		ret = nv40_calc_pll(dev, 0x004008, &pll, perflvl->shader,
 				    &N1, &M1, NULL, NULL, &log2P);
 		if (ret < 0)
 			goto out;

 		info->spll = 0xc0000000 | (log2P << 16) | (N1 << 8) | M1;
 		info->ctrl = 0x00000223;
 	} else {
 		info->spll = 0x00000000;
 		info->ctrl = 0x00000333;
 	}

 	/* memory clock */
 	if (!perflvl->memory) {
 		info->mpll_ctrl = 0x00000000;
 		goto out;
 	}

 	ret = nv40_calc_pll(dev, 0x004020, &pll, perflvl->memory,
 			    &N1, &M1, &N2, &M2, &log2P);
 	if (ret < 0)
 		goto out;

 	info->mpll_ctrl  = 0x80000000 | (log2P << 16);
 	info->mpll_ctrl |= min2(pll.log2p_bias + log2P, pll.max_log2p) << 20;
 	if (N2 == M2) {
 		info->mpll_ctrl |= 0x00000100;
 		info->mpll_coef  = (N1 << 8) | M1;
 	} else {
 		info->mpll_ctrl |= 0x40000000;
 		info->mpll_coef  = (N2 << 24) | (M2 << 16) | (N1 << 8) | M1;
 	}

 out:
 	if (ret < 0) {
 		kfree(info);
 		info = ERR_PTR(ret);
 	}
 	return info;
 }

 static bool
 nv40_pm_gr_idle(void *data)
 {
 	struct drm_device *dev = data;

 	if ((nv_rd32(dev, 0x400760) & 0x000000f0) >> 4 !=
 	    (nv_rd32(dev, 0x400760) & 0x0000000f))
 		return false;

 	if (nv_rd32(dev, 0x400700))
 		return false;

 	return true;
 }

 int
 nv40_pm_clocks_set(struct drm_device *dev, void *pre_state)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nv40_pm_state *info = pre_state;
 	unsigned long flags;
 	struct bit_entry M;
 	u32 crtc_mask = 0;
 	u8 sr1[2];
 	int i, ret = -EAGAIN;

 	/* determine which CRTCs are active, fetch VGA_SR1 for each */
 	for (i = 0; i < 2; i++) {
 		u32 vbl = nv_rd32(dev, 0x600808 + (i * 0x2000));
 		u32 cnt = 0;
 		do {
 			if (vbl != nv_rd32(dev, 0x600808 + (i * 0x2000))) {
 				nv_wr08(dev, 0x0c03c4 + (i * 0x2000), 0x01);
 				sr1[i] = nv_rd08(dev, 0x0c03c5 + (i * 0x2000));
 				if (!(sr1[i] & 0x20))
 					crtc_mask |= (1 << i);
 				break;
 			}
 			udelay(1);
 		} while (cnt++ < 32);
 	}

 	/* halt and idle engines */
 	spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
 	nv_mask(dev, 0x002500, 0x00000001, 0x00000000);
 	if (!nv_wait(dev, 0x002500, 0x00000010, 0x00000000))
 		goto resume;
 	nv_mask(dev, 0x003220, 0x00000001, 0x00000000);
 	if (!nv_wait(dev, 0x003220, 0x00000010, 0x00000000))
 		goto resume;
 	nv_mask(dev, 0x003200, 0x00000001, 0x00000000);
 	nv04_fifo_cache_pull(dev, false);

 	if (!nv_wait_cb(dev, nv40_pm_gr_idle, dev))
 		goto resume;

 	ret = 0;

 	/* set engine clocks */
 	nv_mask(dev, 0x00c040, 0x00000333, 0x00000000);
 	nv_wr32(dev, 0x004004, info->npll_coef);
 	nv_mask(dev, 0x004000, 0xc0070100, info->npll_ctrl);
 	nv_mask(dev, 0x004008, 0xc007ffff, info->spll);
 	mdelay(5);
 	nv_mask(dev, 0x00c040, 0x00000333, info->ctrl);

 	if (!info->mpll_ctrl)
 		goto resume;

 	/* wait for vblank start on active crtcs, disable memory access */
 	for (i = 0; i < 2; i++) {
 		if (!(crtc_mask & (1 << i)))
 			continue;
 		nv_wait(dev, 0x600808 + (i * 0x2000), 0x00010000, 0x00000000);
 		nv_wait(dev, 0x600808 + (i * 0x2000), 0x00010000, 0x00010000);
 		nv_wr08(dev, 0x0c03c4 + (i * 0x2000), 0x01);
 		nv_wr08(dev, 0x0c03c5 + (i * 0x2000), sr1[i] | 0x20);
 	}

 	/* prepare ram for reclocking */
 	nv_wr32(dev, 0x1002d4, 0x00000001); /* precharge */
 	nv_wr32(dev, 0x1002d0, 0x00000001); /* refresh */
 	nv_wr32(dev, 0x1002d0, 0x00000001); /* refresh */
 	nv_mask(dev, 0x100210, 0x80000000, 0x00000000); /* no auto refresh */
 	nv_wr32(dev, 0x1002dc, 0x00000001); /* enable self-refresh */

 	/* change the PLL of each memory partition */
 	nv_mask(dev, 0x00c040, 0x0000c000, 0x00000000);
 	switch (dev_priv->chipset) {
 	case 0x40:
 	case 0x45:
 	case 0x41:
 	case 0x42:
 	case 0x47:
 		nv_mask(dev, 0x004044, 0xc0771100, info->mpll_ctrl);
 		nv_mask(dev, 0x00402c, 0xc0771100, info->mpll_ctrl);
 		nv_wr32(dev, 0x004048, info->mpll_coef);
 		nv_wr32(dev, 0x004030, info->mpll_coef);
 	case 0x43:
 	case 0x49:
 	case 0x4b:
 		nv_mask(dev, 0x004038, 0xc0771100, info->mpll_ctrl);
 		nv_wr32(dev, 0x00403c, info->mpll_coef);
 	default:
 		nv_mask(dev, 0x004020, 0xc0771100, info->mpll_ctrl);
 		nv_wr32(dev, 0x004024, info->mpll_coef);
 		break;
 	}
 	udelay(100);
 	nv_mask(dev, 0x00c040, 0x0000c000, 0x0000c000);

 	/* re-enable normal operation of memory controller */
 	nv_wr32(dev, 0x1002dc, 0x00000000);
 	nv_mask(dev, 0x100210, 0x80000000, 0x80000000);
 	udelay(100);

 	/* execute memory reset script from vbios */
 	if (!bit_table(dev, 'M', &M))
 		nouveau_bios_init_exec(dev, ROM16(M.data[0]));

 	/* make sure we're in vblank (hopefully the same one as before), and
 	 * then re-enable crtc memory access
 	 */
 	for (i = 0; i < 2; i++) {
 		if (!(crtc_mask & (1 << i)))
 			continue;
 		nv_wait(dev, 0x600808 + (i * 0x2000), 0x00010000, 0x00010000);
 		nv_wr08(dev, 0x0c03c4 + (i * 0x2000), 0x01);
 		nv_wr08(dev, 0x0c03c5 + (i * 0x2000), sr1[i]);
 	}

 	/* resume engines */
 resume:
 	nv_wr32(dev, 0x003250, 0x00000001);
 	nv_mask(dev, 0x003220, 0x00000001, 0x00000001);
 	nv_wr32(dev, 0x003200, 0x00000001);
 	nv_wr32(dev, 0x002500, 0x00000001);
 	spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);

 	kfree(info);
 	return ret;
 }

 int
 nv40_pm_pwm_get(struct drm_device *dev, int line, u32 *divs, u32 *duty)
 {
 	if (line == 2) {
 		u32 reg = nv_rd32(dev, 0x0010f0);
 		if (reg & 0x80000000) {
 			*duty = (reg & 0x7fff0000) >> 16;
 			*divs = (reg & 0x00007fff);
 			return 0;
 		}
 	} else
 	if (line == 9) {
 		u32 reg = nv_rd32(dev, 0x0015f4);
 		if (reg & 0x80000000) {
 			*divs = nv_rd32(dev, 0x0015f8);
 			*duty = (reg & 0x7fffffff);
 			return 0;
 		}
 	} else {
 		NV_ERROR(dev, "unknown pwm ctrl for gpio %d\n", line);
 		return -ENODEV;
 	}

 	return -EINVAL;
 }

 int
 nv40_pm_pwm_set(struct drm_device *dev, int line, u32 divs, u32 duty)
 {
 	if (line == 2) {
 		nv_wr32(dev, 0x0010f0, 0x80000000 | (duty << 16) | divs);
 	} else
 	if (line == 9) {
 		nv_wr32(dev, 0x0015f8, divs);
 		nv_wr32(dev, 0x0015f4, duty | 0x80000000);
 	} else {
 		NV_ERROR(dev, "unknown pwm ctrl for gpio %d\n", line);
 		return -ENODEV;
 	}

 	return 0;
 }
	/*
	* Copyright 2011 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"
	#include "nouveau_hw.h"

	#define min2(a,b) ((a) < (b) ? (a) : (b))

	static u32
	read_pll_1(struct drm_device *dev, u32 reg)
	{
	u32 ctrl = nv_rd32(dev, reg + 0x00);
	int P = (ctrl & 0x00070000) >> 16;
	int N = (ctrl & 0x0000ff00) >> 8;
	int M = (ctrl & 0x000000ff) >> 0;
	u32 ref = 27000, clk = 0;

	if (ctrl & 0x80000000)
	clk = ref * N / M;

	return clk >> P;
	}

	static u32
	read_pll_2(struct drm_device *dev, u32 reg)
	{
	u32 ctrl = nv_rd32(dev, reg + 0x00);
	u32 coef = nv_rd32(dev, reg + 0x04);
	int N2 = (coef & 0xff000000) >> 24;
	int M2 = (coef & 0x00ff0000) >> 16;
	int N1 = (coef & 0x0000ff00) >> 8;
	int M1 = (coef & 0x000000ff) >> 0;
	int P = (ctrl & 0x00070000) >> 16;
	u32 ref = 27000, clk = 0;

	if ((ctrl & 0x80000000) && M1) {
	clk = ref * N1 / M1;
	if ((ctrl & 0x40000100) == 0x40000000) {
	if (M2)
	clk = clk * N2 / M2;
	else
	clk = 0;
	}
	}

	return clk >> P;
	}

	static u32
	read_clk(struct drm_device *dev, u32 src)
	{
	switch (src) {
	case 3:
	return read_pll_2(dev, 0x004000);
	case 2:
	return read_pll_1(dev, 0x004008);
	default:
	break;
	}

	return 0;
	}

	int
	nv40_pm_clocks_get(struct drm_device dev, struct nouveau_pm_level perflvl)
	{
	u32 ctrl = nv_rd32(dev, 0x00c040);

	perflvl->core = read_clk(dev, (ctrl & 0x00000003) >> 0);
	perflvl->shader = read_clk(dev, (ctrl & 0x00000030) >> 4);
	perflvl->memory = read_pll_2(dev, 0x4020);
	return 0;
	}

	struct nv40_pm_state {
	u32 ctrl;
	u32 npll_ctrl;
	u32 npll_coef;
	u32 spll;
	u32 mpll_ctrl;
	u32 mpll_coef;
	};

	static int
	nv40_calc_pll(struct drm_device dev, u32 reg, struct pll_lims pll,
	u32 clk, int N1, int M1, int N2, int M2, int *log2P)
	{
	struct nouveau_pll_vals coef;
	int ret;

	ret = get_pll_limits(dev, reg, pll);
	if (ret)
	return ret;

	if (clk < pll->vco1.maxfreq)
	pll->vco2.maxfreq = 0;

	ret = nouveau_calc_pll_mnp(dev, pll, clk, &coef);
	if (ret == 0)
	return -ERANGE;

	*N1 = coef.N1;
	*M1 = coef.M1;
	if (N2 && M2) {
	if (pll->vco2.maxfreq) {
	*N2 = coef.N2;
	*M2 = coef.M2;
	} else {
	*N2 = 1;
	*M2 = 1;
	}
	}
	*log2P = coef.log2P;
	return 0;
	}

	void *
	nv40_pm_clocks_pre(struct drm_device dev, struct nouveau_pm_level perflvl)
	{
	struct nv40_pm_state *info;
	struct pll_lims pll;
	int N1, N2, M1, M2, log2P;
	int ret;

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

	/* core/geometric clock */
	ret = nv40_calc_pll(dev, 0x004000, &pll, perflvl->core,
	&N1, &M1, &N2, &M2, &log2P);
	if (ret < 0)
	goto out;

	if (N2 == M2) {
	info->npll_ctrl = 0x80000100 \| (log2P << 16);
	info->npll_coef = (N1 << 8) \| M1;
	} else {
	info->npll_ctrl = 0xc0000000 \| (log2P << 16);
	info->npll_coef = (N2 << 24) \| (M2 << 16) \| (N1 << 8) \| M1;
	}

	/* use the second PLL for shader/rop clock, if it differs from core */
	if (perflvl->shader && perflvl->shader != perflvl->core) {
	ret = nv40_calc_pll(dev, 0x004008, &pll, perflvl->shader,
	&N1, &M1, NULL, NULL, &log2P);
	if (ret < 0)
	goto out;

	info->spll = 0xc0000000 \| (log2P << 16) \| (N1 << 8) \| M1;
	info->ctrl = 0x00000223;
	} else {
	info->spll = 0x00000000;
	info->ctrl = 0x00000333;
	}

	/* memory clock */
	if (!perflvl->memory) {
	info->mpll_ctrl = 0x00000000;
	goto out;
	}

	ret = nv40_calc_pll(dev, 0x004020, &pll, perflvl->memory,
	&N1, &M1, &N2, &M2, &log2P);
	if (ret < 0)
	goto out;

	info->mpll_ctrl = 0x80000000 \| (log2P << 16);
	info->mpll_ctrl \|= min2(pll.log2p_bias + log2P, pll.max_log2p) << 20;
	if (N2 == M2) {
	info->mpll_ctrl \|= 0x00000100;
	info->mpll_coef = (N1 << 8) \| M1;
	} else {
	info->mpll_ctrl \|= 0x40000000;
	info->mpll_coef = (N2 << 24) \| (M2 << 16) \| (N1 << 8) \| M1;
	}

	out:
	if (ret < 0) {
	kfree(info);
	info = ERR_PTR(ret);
	}
	return info;
	}

	static bool
	nv40_pm_gr_idle(void *data)
	{
	struct drm_device *dev = data;

	if ((nv_rd32(dev, 0x400760) & 0x000000f0) >> 4 !=
	(nv_rd32(dev, 0x400760) & 0x0000000f))
	return false;

	if (nv_rd32(dev, 0x400700))
	return false;

	return true;
	}

	int
	nv40_pm_clocks_set(struct drm_device dev, void pre_state)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nv40_pm_state *info = pre_state;
	unsigned long flags;
	struct bit_entry M;
	u32 crtc_mask = 0;
	u8 sr1[2];
	int i, ret = -EAGAIN;

	/* determine which CRTCs are active, fetch VGA_SR1 for each */
	for (i = 0; i < 2; i++) {
	u32 vbl = nv_rd32(dev, 0x600808 + (i * 0x2000));
	u32 cnt = 0;
	do {
	if (vbl != nv_rd32(dev, 0x600808 + (i * 0x2000))) {
	nv_wr08(dev, 0x0c03c4 + (i * 0x2000), 0x01);
	sr1[i] = nv_rd08(dev, 0x0c03c5 + (i * 0x2000));
	if (!(sr1[i] & 0x20))
	crtc_mask \|= (1 << i);
	break;
	}
	udelay(1);
	} while (cnt++ < 32);
	}

	/* halt and idle engines */
	spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
	nv_mask(dev, 0x002500, 0x00000001, 0x00000000);
	if (!nv_wait(dev, 0x002500, 0x00000010, 0x00000000))
	goto resume;
	nv_mask(dev, 0x003220, 0x00000001, 0x00000000);
	if (!nv_wait(dev, 0x003220, 0x00000010, 0x00000000))
	goto resume;
	nv_mask(dev, 0x003200, 0x00000001, 0x00000000);
	nv04_fifo_cache_pull(dev, false);

	if (!nv_wait_cb(dev, nv40_pm_gr_idle, dev))
	goto resume;

	ret = 0;

	/* set engine clocks */
	nv_mask(dev, 0x00c040, 0x00000333, 0x00000000);
	nv_wr32(dev, 0x004004, info->npll_coef);
	nv_mask(dev, 0x004000, 0xc0070100, info->npll_ctrl);
	nv_mask(dev, 0x004008, 0xc007ffff, info->spll);
	mdelay(5);
	nv_mask(dev, 0x00c040, 0x00000333, info->ctrl);

	if (!info->mpll_ctrl)
	goto resume;

	/* wait for vblank start on active crtcs, disable memory access */
	for (i = 0; i < 2; i++) {
	if (!(crtc_mask & (1 << i)))
	continue;
	nv_wait(dev, 0x600808 + (i * 0x2000), 0x00010000, 0x00000000);
	nv_wait(dev, 0x600808 + (i * 0x2000), 0x00010000, 0x00010000);
	nv_wr08(dev, 0x0c03c4 + (i * 0x2000), 0x01);
	nv_wr08(dev, 0x0c03c5 + (i * 0x2000), sr1[i] \| 0x20);
	}

	/* prepare ram for reclocking */
	nv_wr32(dev, 0x1002d4, 0x00000001); /* precharge */
	nv_wr32(dev, 0x1002d0, 0x00000001); /* refresh */
	nv_wr32(dev, 0x1002d0, 0x00000001); /* refresh */
	nv_mask(dev, 0x100210, 0x80000000, 0x00000000); /* no auto refresh */
	nv_wr32(dev, 0x1002dc, 0x00000001); /* enable self-refresh */

	/* change the PLL of each memory partition */
	nv_mask(dev, 0x00c040, 0x0000c000, 0x00000000);
	switch (dev_priv->chipset) {
	case 0x40:
	case 0x45:
	case 0x41:
	case 0x42:
	case 0x47:
	nv_mask(dev, 0x004044, 0xc0771100, info->mpll_ctrl);
	nv_mask(dev, 0x00402c, 0xc0771100, info->mpll_ctrl);
	nv_wr32(dev, 0x004048, info->mpll_coef);
	nv_wr32(dev, 0x004030, info->mpll_coef);
	case 0x43:
	case 0x49:
	case 0x4b:
	nv_mask(dev, 0x004038, 0xc0771100, info->mpll_ctrl);
	nv_wr32(dev, 0x00403c, info->mpll_coef);
	default:
	nv_mask(dev, 0x004020, 0xc0771100, info->mpll_ctrl);
	nv_wr32(dev, 0x004024, info->mpll_coef);
	break;
	}
	udelay(100);
	nv_mask(dev, 0x00c040, 0x0000c000, 0x0000c000);

	/* re-enable normal operation of memory controller */
	nv_wr32(dev, 0x1002dc, 0x00000000);
	nv_mask(dev, 0x100210, 0x80000000, 0x80000000);
	udelay(100);

	/* execute memory reset script from vbios */
	if (!bit_table(dev, 'M', &M))
	nouveau_bios_init_exec(dev, ROM16(M.data[0]));

	/* make sure we're in vblank (hopefully the same one as before), and
	* then re-enable crtc memory access
	*/
	for (i = 0; i < 2; i++) {
	if (!(crtc_mask & (1 << i)))
	continue;
	nv_wait(dev, 0x600808 + (i * 0x2000), 0x00010000, 0x00010000);
	nv_wr08(dev, 0x0c03c4 + (i * 0x2000), 0x01);
	nv_wr08(dev, 0x0c03c5 + (i * 0x2000), sr1[i]);
	}

	/* resume engines */
	resume:
	nv_wr32(dev, 0x003250, 0x00000001);
	nv_mask(dev, 0x003220, 0x00000001, 0x00000001);
	nv_wr32(dev, 0x003200, 0x00000001);
	nv_wr32(dev, 0x002500, 0x00000001);
	spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);

	kfree(info);
	return ret;
	}

	int
	nv40_pm_pwm_get(struct drm_device dev, int line, u32 divs, u32 *duty)
	{
	if (line == 2) {
	u32 reg = nv_rd32(dev, 0x0010f0);
	if (reg & 0x80000000) {
	*duty = (reg & 0x7fff0000) >> 16;
	*divs = (reg & 0x00007fff);
	return 0;
	}
	} else
	if (line == 9) {
	u32 reg = nv_rd32(dev, 0x0015f4);
	if (reg & 0x80000000) {
	*divs = nv_rd32(dev, 0x0015f8);
	*duty = (reg & 0x7fffffff);
	return 0;
	}
	} else {
	NV_ERROR(dev, "unknown pwm ctrl for gpio %d\n", line);
	return -ENODEV;
	}

	return -EINVAL;
	}

	int
	nv40_pm_pwm_set(struct drm_device *dev, int line, u32 divs, u32 duty)
	{
	if (line == 2) {
	nv_wr32(dev, 0x0010f0, 0x80000000 \| (duty << 16) \| divs);
	} else
	if (line == 9) {
	nv_wr32(dev, 0x0015f8, divs);
	nv_wr32(dev, 0x0015f4, duty \| 0x80000000);
	} else {
	NV_ERROR(dev, "unknown pwm ctrl for gpio %d\n", line);
	return -ENODEV;
	}

	return 0;
	}