drivers/gpu/drm/mgag200/mgag200_g200wb.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only

 #include <linux/delay.h>
 #include <linux/pci.h>

 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_gem_atomic_helper.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_vblank.h>

 #include "mgag200_drv.h"

 void mgag200_g200wb_init_registers(struct mga_device *mdev)
 {
 	static const u8 dacvalue[] = {
 		MGAG200_DAC_DEFAULT(0x07, 0xc9, 0x1f, 0x00, 0x00, 0x00)
 	};

 	size_t i;

 	for (i = 0; i < ARRAY_SIZE(dacvalue); i++) {
 		if ((i <= 0x17) ||
 		    (i == 0x1b) ||
 		    (i == 0x1c) ||
 		    ((i >= 0x1f) && (i <= 0x29)) ||
 		    ((i >= 0x30) && (i <= 0x37)) ||
 		    ((i >= 0x44) && (i <= 0x4e)))
 			continue;
 		WREG_DAC(i, dacvalue[i]);
 	}

 	mgag200_init_registers(mdev);
 }

 /*
  * PIXPLLC
  */

 static int mgag200_g200wb_pixpllc_atomic_check(struct drm_crtc *crtc,
 					       struct drm_atomic_state *new_state)
 {
 	static const unsigned int vcomax = 550000;
 	static const unsigned int vcomin = 150000;
 	static const unsigned int pllreffreq = 48000;

 	struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(new_state, crtc);
 	struct mgag200_crtc_state *new_mgag200_crtc_state = to_mgag200_crtc_state(new_crtc_state);
 	long clock = new_crtc_state->mode.clock;
 	struct mgag200_pll_values *pixpllc = &new_mgag200_crtc_state->pixpllc;
 	unsigned int delta, tmpdelta;
 	unsigned int testp, testm, testn;
 	unsigned int p, m, n, s;
 	unsigned int computed;

 	m = n = p = s = 0;
 	delta = 0xffffffff;

 	for (testp = 1; testp < 9; testp++) {
 		if (clock * testp > vcomax)
 			continue;
 		if (clock * testp < vcomin)
 			continue;

 		for (testm = 1; testm < 17; testm++) {
 			for (testn = 1; testn < 151; testn++) {
 				computed = (pllreffreq * testn) / (testm * testp);
 				if (computed > clock)
 					tmpdelta = computed - clock;
 				else
 					tmpdelta = clock - computed;
 				if (tmpdelta < delta) {
 					delta = tmpdelta;
 					n = testn;
 					m = testm;
 					p = testp;
 					s = 0;
 				}
 			}
 		}
 	}

 	pixpllc->m = m;
 	pixpllc->n = n;
 	pixpllc->p = p;
 	pixpllc->s = s;

 	return 0;
 }

 void mgag200_g200wb_pixpllc_atomic_update(struct drm_crtc *crtc,
 					  struct drm_atomic_state *old_state)
 {
 	struct drm_device *dev = crtc->dev;
 	struct mga_device *mdev = to_mga_device(dev);
 	struct drm_crtc_state *crtc_state = crtc->state;
 	struct mgag200_crtc_state *mgag200_crtc_state = to_mgag200_crtc_state(crtc_state);
 	struct mgag200_pll_values *pixpllc = &mgag200_crtc_state->pixpllc;
 	bool pll_locked = false;
 	unsigned int pixpllcm, pixpllcn, pixpllcp, pixpllcs;
 	u8 xpixpllcm, xpixpllcn, xpixpllcp, tmp;
 	int i, j, tmpcount, vcount;

 	pixpllcm = pixpllc->m - 1;
 	pixpllcn = pixpllc->n - 1;
 	pixpllcp = pixpllc->p - 1;
 	pixpllcs = pixpllc->s;

 	xpixpllcm = ((pixpllcn & BIT(8)) >> 1) | pixpllcm;
 	xpixpllcn = pixpllcn;
 	xpixpllcp = ((pixpllcn & GENMASK(10, 9)) >> 3) | (pixpllcs << 3) | pixpllcp;

 	WREG_MISC_MASKED(MGAREG_MISC_CLKSEL_MGA, MGAREG_MISC_CLKSEL_MASK);

 	for (i = 0; i <= 32 && pll_locked == false; i++) {
 		if (i > 0) {
 			WREG8(MGAREG_CRTC_INDEX, 0x1e);
 			tmp = RREG8(MGAREG_CRTC_DATA);
 			if (tmp < 0xff)
 				WREG8(MGAREG_CRTC_DATA, tmp+1);
 		}

 		/* set pixclkdis to 1 */
 		WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
 		tmp = RREG8(DAC_DATA);
 		tmp |= MGA1064_PIX_CLK_CTL_CLK_DIS;
 		WREG8(DAC_DATA, tmp);

 		WREG8(DAC_INDEX, MGA1064_REMHEADCTL);
 		tmp = RREG8(DAC_DATA);
 		tmp |= MGA1064_REMHEADCTL_CLKDIS;
 		WREG8(DAC_DATA, tmp);

 		/* select PLL Set C */
 		tmp = RREG8(MGAREG_MEM_MISC_READ);
 		tmp |= 0x3 << 2;
 		WREG8(MGAREG_MEM_MISC_WRITE, tmp);

 		WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
 		tmp = RREG8(DAC_DATA);
 		tmp |= MGA1064_PIX_CLK_CTL_CLK_POW_DOWN | 0x80;
 		WREG8(DAC_DATA, tmp);

 		udelay(500);

 		/* reset the PLL */
 		WREG8(DAC_INDEX, MGA1064_VREF_CTL);
 		tmp = RREG8(DAC_DATA);
 		tmp &= ~0x04;
 		WREG8(DAC_DATA, tmp);

 		udelay(50);

 		/* program pixel pll register */
 		WREG_DAC(MGA1064_WB_PIX_PLLC_N, xpixpllcn);
 		WREG_DAC(MGA1064_WB_PIX_PLLC_M, xpixpllcm);
 		WREG_DAC(MGA1064_WB_PIX_PLLC_P, xpixpllcp);

 		udelay(50);

 		/* turn pll on */
 		WREG8(DAC_INDEX, MGA1064_VREF_CTL);
 		tmp = RREG8(DAC_DATA);
 		tmp |= 0x04;
 		WREG_DAC(MGA1064_VREF_CTL, tmp);

 		udelay(500);

 		/* select the pixel pll */
 		WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
 		tmp = RREG8(DAC_DATA);
 		tmp &= ~MGA1064_PIX_CLK_CTL_SEL_MSK;
 		tmp |= MGA1064_PIX_CLK_CTL_SEL_PLL;
 		WREG8(DAC_DATA, tmp);

 		WREG8(DAC_INDEX, MGA1064_REMHEADCTL);
 		tmp = RREG8(DAC_DATA);
 		tmp &= ~MGA1064_REMHEADCTL_CLKSL_MSK;
 		tmp |= MGA1064_REMHEADCTL_CLKSL_PLL;
 		WREG8(DAC_DATA, tmp);

 		/* reset dotclock rate bit */
 		WREG8(MGAREG_SEQ_INDEX, 1);
 		tmp = RREG8(MGAREG_SEQ_DATA);
 		tmp &= ~0x8;
 		WREG8(MGAREG_SEQ_DATA, tmp);

 		WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
 		tmp = RREG8(DAC_DATA);
 		tmp &= ~MGA1064_PIX_CLK_CTL_CLK_DIS;
 		WREG8(DAC_DATA, tmp);

 		vcount = RREG8(MGAREG_VCOUNT);

 		for (j = 0; j < 30 && pll_locked == false; j++) {
 			tmpcount = RREG8(MGAREG_VCOUNT);
 			if (tmpcount < vcount)
 				vcount = 0;
 			if ((tmpcount - vcount) > 2)
 				pll_locked = true;
 			else
 				udelay(5);
 		}
 	}

 	WREG8(DAC_INDEX, MGA1064_REMHEADCTL);
 	tmp = RREG8(DAC_DATA);
 	tmp &= ~MGA1064_REMHEADCTL_CLKDIS;
 	WREG_DAC(MGA1064_REMHEADCTL, tmp);
 }

 /*
  * Mode-setting pipeline
  */

 static const struct drm_plane_helper_funcs mgag200_g200wb_primary_plane_helper_funcs = {
 	MGAG200_PRIMARY_PLANE_HELPER_FUNCS,
 };

 static const struct drm_plane_funcs mgag200_g200wb_primary_plane_funcs = {
 	MGAG200_PRIMARY_PLANE_FUNCS,
 };

 static const struct drm_crtc_helper_funcs mgag200_g200wb_crtc_helper_funcs = {
 	MGAG200_CRTC_HELPER_FUNCS,
 };

 static const struct drm_crtc_funcs mgag200_g200wb_crtc_funcs = {
 	MGAG200_CRTC_FUNCS,
 };

 static int mgag200_g200wb_pipeline_init(struct mga_device *mdev)
 {
 	struct drm_device *dev = &mdev->base;
 	struct drm_plane *primary_plane = &mdev->primary_plane;
 	struct drm_crtc *crtc = &mdev->crtc;
 	int ret;

 	ret = drm_universal_plane_init(dev, primary_plane, 0,
 				       &mgag200_g200wb_primary_plane_funcs,
 				       mgag200_primary_plane_formats,
 				       mgag200_primary_plane_formats_size,
 				       mgag200_primary_plane_fmtmods,
 				       DRM_PLANE_TYPE_PRIMARY, NULL);
 	if (ret) {
 		drm_err(dev, "drm_universal_plane_init() failed: %d\n", ret);
 		return ret;
 	}
 	drm_plane_helper_add(primary_plane, &mgag200_g200wb_primary_plane_helper_funcs);
 	drm_plane_enable_fb_damage_clips(primary_plane);

 	ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL,
 					&mgag200_g200wb_crtc_funcs, NULL);
 	if (ret) {
 		drm_err(dev, "drm_crtc_init_with_planes() failed: %d\n", ret);
 		return ret;
 	}
 	drm_crtc_helper_add(crtc, &mgag200_g200wb_crtc_helper_funcs);

 	/* FIXME: legacy gamma tables, but atomic gamma doesn't work without */
 	drm_mode_crtc_set_gamma_size(crtc, MGAG200_LUT_SIZE);
 	drm_crtc_enable_color_mgmt(crtc, 0, false, MGAG200_LUT_SIZE);

 	ret = mgag200_vga_bmc_output_init(mdev);
 	if (ret)
 		return ret;

 	return 0;
 }

 /*
  * DRM device
  */

 static const struct mgag200_device_info mgag200_g200wb_device_info =
 	MGAG200_DEVICE_INFO_INIT(1280, 1024, 31877, true, 0, 1, false);

 static const struct mgag200_device_funcs mgag200_g200wb_device_funcs = {
 	.pixpllc_atomic_check = mgag200_g200wb_pixpllc_atomic_check,
 	.pixpllc_atomic_update = mgag200_g200wb_pixpllc_atomic_update,
 };

 struct mga_device *mgag200_g200wb_device_create(struct pci_dev *pdev, const struct drm_driver *drv)
 {
 	struct mga_device *mdev;
 	struct drm_device *dev;
 	resource_size_t vram_available;
 	int ret;

 	mdev = devm_drm_dev_alloc(&pdev->dev, drv, struct mga_device, base);
 	if (IS_ERR(mdev))
 		return mdev;
 	dev = &mdev->base;

 	pci_set_drvdata(pdev, dev);

 	ret = mgag200_init_pci_options(pdev, 0x41049120, 0x0000b000);
 	if (ret)
 		return ERR_PTR(ret);

 	ret = mgag200_device_preinit(mdev);
 	if (ret)
 		return ERR_PTR(ret);

 	ret = mgag200_device_init(mdev, &mgag200_g200wb_device_info,
 				  &mgag200_g200wb_device_funcs);
 	if (ret)
 		return ERR_PTR(ret);

 	mgag200_g200wb_init_registers(mdev);

 	vram_available = mgag200_device_probe_vram(mdev);

 	ret = mgag200_mode_config_init(mdev, vram_available);
 	if (ret)
 		return ERR_PTR(ret);

 	ret = mgag200_g200wb_pipeline_init(mdev);
 	if (ret)
 		return ERR_PTR(ret);

 	drm_mode_config_reset(dev);
 	drm_kms_helper_poll_init(dev);

 	ret = drm_vblank_init(dev, 1);
 	if (ret)
 		return ERR_PTR(ret);

 	return mdev;
 }
	// SPDX-License-Identifier: GPL-2.0-only

	#include <linux/delay.h>
	#include <linux/pci.h>

	#include <drm/drm_atomic.h>
	#include <drm/drm_atomic_helper.h>
	#include <drm/drm_drv.h>
	#include <drm/drm_gem_atomic_helper.h>
	#include <drm/drm_probe_helper.h>
	#include <drm/drm_vblank.h>

	#include "mgag200_drv.h"

	void mgag200_g200wb_init_registers(struct mga_device *mdev)
	{
	static const u8 dacvalue[] = {
	MGAG200_DAC_DEFAULT(0x07, 0xc9, 0x1f, 0x00, 0x00, 0x00)
	};

	size_t i;

	for (i = 0; i < ARRAY_SIZE(dacvalue); i++) {
	if ((i <= 0x17) \|\|
	(i == 0x1b) \|\|
	(i == 0x1c) \|\|
	((i >= 0x1f) && (i <= 0x29)) \|\|
	((i >= 0x30) && (i <= 0x37)) \|\|
	((i >= 0x44) && (i <= 0x4e)))
	continue;
	WREG_DAC(i, dacvalue[i]);
	}

	mgag200_init_registers(mdev);
	}

	/*
	* PIXPLLC
	*/

	static int mgag200_g200wb_pixpllc_atomic_check(struct drm_crtc *crtc,
	struct drm_atomic_state *new_state)
	{
	static const unsigned int vcomax = 550000;
	static const unsigned int vcomin = 150000;
	static const unsigned int pllreffreq = 48000;

	struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(new_state, crtc);
	struct mgag200_crtc_state *new_mgag200_crtc_state = to_mgag200_crtc_state(new_crtc_state);
	long clock = new_crtc_state->mode.clock;
	struct mgag200_pll_values *pixpllc = &new_mgag200_crtc_state->pixpllc;
	unsigned int delta, tmpdelta;
	unsigned int testp, testm, testn;
	unsigned int p, m, n, s;
	unsigned int computed;

	m = n = p = s = 0;
	delta = 0xffffffff;

	for (testp = 1; testp < 9; testp++) {
	if (clock * testp > vcomax)
	continue;
	if (clock * testp < vcomin)
	continue;

	for (testm = 1; testm < 17; testm++) {
	for (testn = 1; testn < 151; testn++) {
	computed = (pllreffreq * testn) / (testm * testp);
	if (computed > clock)
	tmpdelta = computed - clock;
	else
	tmpdelta = clock - computed;
	if (tmpdelta < delta) {
	delta = tmpdelta;
	n = testn;
	m = testm;
	p = testp;
	s = 0;
	}
	}
	}
	}

	pixpllc->m = m;
	pixpllc->n = n;
	pixpllc->p = p;
	pixpllc->s = s;

	return 0;
	}

	void mgag200_g200wb_pixpllc_atomic_update(struct drm_crtc *crtc,
	struct drm_atomic_state *old_state)
	{
	struct drm_device *dev = crtc->dev;
	struct mga_device *mdev = to_mga_device(dev);
	struct drm_crtc_state *crtc_state = crtc->state;
	struct mgag200_crtc_state *mgag200_crtc_state = to_mgag200_crtc_state(crtc_state);
	struct mgag200_pll_values *pixpllc = &mgag200_crtc_state->pixpllc;
	bool pll_locked = false;
	unsigned int pixpllcm, pixpllcn, pixpllcp, pixpllcs;
	u8 xpixpllcm, xpixpllcn, xpixpllcp, tmp;
	int i, j, tmpcount, vcount;

	pixpllcm = pixpllc->m - 1;
	pixpllcn = pixpllc->n - 1;
	pixpllcp = pixpllc->p - 1;
	pixpllcs = pixpllc->s;

	xpixpllcm = ((pixpllcn & BIT(8)) >> 1) \| pixpllcm;
	xpixpllcn = pixpllcn;
	xpixpllcp = ((pixpllcn & GENMASK(10, 9)) >> 3) \| (pixpllcs << 3) \| pixpllcp;

	WREG_MISC_MASKED(MGAREG_MISC_CLKSEL_MGA, MGAREG_MISC_CLKSEL_MASK);

	for (i = 0; i <= 32 && pll_locked == false; i++) {
	if (i > 0) {
	WREG8(MGAREG_CRTC_INDEX, 0x1e);
	tmp = RREG8(MGAREG_CRTC_DATA);
	if (tmp < 0xff)
	WREG8(MGAREG_CRTC_DATA, tmp+1);
	}

	/* set pixclkdis to 1 */
	WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
	tmp = RREG8(DAC_DATA);
	tmp \|= MGA1064_PIX_CLK_CTL_CLK_DIS;
	WREG8(DAC_DATA, tmp);

	WREG8(DAC_INDEX, MGA1064_REMHEADCTL);
	tmp = RREG8(DAC_DATA);
	tmp \|= MGA1064_REMHEADCTL_CLKDIS;
	WREG8(DAC_DATA, tmp);

	/* select PLL Set C */
	tmp = RREG8(MGAREG_MEM_MISC_READ);
	tmp \|= 0x3 << 2;
	WREG8(MGAREG_MEM_MISC_WRITE, tmp);

	WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
	tmp = RREG8(DAC_DATA);
	tmp \|= MGA1064_PIX_CLK_CTL_CLK_POW_DOWN \| 0x80;
	WREG8(DAC_DATA, tmp);

	udelay(500);

	/* reset the PLL */
	WREG8(DAC_INDEX, MGA1064_VREF_CTL);
	tmp = RREG8(DAC_DATA);
	tmp &= ~0x04;
	WREG8(DAC_DATA, tmp);

	udelay(50);

	/* program pixel pll register */
	WREG_DAC(MGA1064_WB_PIX_PLLC_N, xpixpllcn);
	WREG_DAC(MGA1064_WB_PIX_PLLC_M, xpixpllcm);
	WREG_DAC(MGA1064_WB_PIX_PLLC_P, xpixpllcp);

	udelay(50);

	/* turn pll on */
	WREG8(DAC_INDEX, MGA1064_VREF_CTL);
	tmp = RREG8(DAC_DATA);
	tmp \|= 0x04;
	WREG_DAC(MGA1064_VREF_CTL, tmp);

	udelay(500);

	/* select the pixel pll */
	WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
	tmp = RREG8(DAC_DATA);
	tmp &= ~MGA1064_PIX_CLK_CTL_SEL_MSK;
	tmp \|= MGA1064_PIX_CLK_CTL_SEL_PLL;
	WREG8(DAC_DATA, tmp);

	WREG8(DAC_INDEX, MGA1064_REMHEADCTL);
	tmp = RREG8(DAC_DATA);
	tmp &= ~MGA1064_REMHEADCTL_CLKSL_MSK;
	tmp \|= MGA1064_REMHEADCTL_CLKSL_PLL;
	WREG8(DAC_DATA, tmp);

	/* reset dotclock rate bit */
	WREG8(MGAREG_SEQ_INDEX, 1);
	tmp = RREG8(MGAREG_SEQ_DATA);
	tmp &= ~0x8;
	WREG8(MGAREG_SEQ_DATA, tmp);

	WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
	tmp = RREG8(DAC_DATA);
	tmp &= ~MGA1064_PIX_CLK_CTL_CLK_DIS;
	WREG8(DAC_DATA, tmp);

	vcount = RREG8(MGAREG_VCOUNT);

	for (j = 0; j < 30 && pll_locked == false; j++) {
	tmpcount = RREG8(MGAREG_VCOUNT);
	if (tmpcount < vcount)
	vcount = 0;
	if ((tmpcount - vcount) > 2)
	pll_locked = true;
	else
	udelay(5);
	}
	}

	WREG8(DAC_INDEX, MGA1064_REMHEADCTL);
	tmp = RREG8(DAC_DATA);
	tmp &= ~MGA1064_REMHEADCTL_CLKDIS;
	WREG_DAC(MGA1064_REMHEADCTL, tmp);
	}

	/*
	* Mode-setting pipeline
	*/

	static const struct drm_plane_helper_funcs mgag200_g200wb_primary_plane_helper_funcs = {
	MGAG200_PRIMARY_PLANE_HELPER_FUNCS,
	};

	static const struct drm_plane_funcs mgag200_g200wb_primary_plane_funcs = {
	MGAG200_PRIMARY_PLANE_FUNCS,
	};

	static const struct drm_crtc_helper_funcs mgag200_g200wb_crtc_helper_funcs = {
	MGAG200_CRTC_HELPER_FUNCS,
	};

	static const struct drm_crtc_funcs mgag200_g200wb_crtc_funcs = {
	MGAG200_CRTC_FUNCS,
	};

	static int mgag200_g200wb_pipeline_init(struct mga_device *mdev)
	{
	struct drm_device *dev = &mdev->base;
	struct drm_plane *primary_plane = &mdev->primary_plane;
	struct drm_crtc *crtc = &mdev->crtc;
	int ret;

	ret = drm_universal_plane_init(dev, primary_plane, 0,
	&mgag200_g200wb_primary_plane_funcs,
	mgag200_primary_plane_formats,
	mgag200_primary_plane_formats_size,
	mgag200_primary_plane_fmtmods,
	DRM_PLANE_TYPE_PRIMARY, NULL);
	if (ret) {
	drm_err(dev, "drm_universal_plane_init() failed: %d\n", ret);
	return ret;
	}
	drm_plane_helper_add(primary_plane, &mgag200_g200wb_primary_plane_helper_funcs);
	drm_plane_enable_fb_damage_clips(primary_plane);

	ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL,
	&mgag200_g200wb_crtc_funcs, NULL);
	if (ret) {
	drm_err(dev, "drm_crtc_init_with_planes() failed: %d\n", ret);
	return ret;
	}
	drm_crtc_helper_add(crtc, &mgag200_g200wb_crtc_helper_funcs);

	/* FIXME: legacy gamma tables, but atomic gamma doesn't work without */
	drm_mode_crtc_set_gamma_size(crtc, MGAG200_LUT_SIZE);
	drm_crtc_enable_color_mgmt(crtc, 0, false, MGAG200_LUT_SIZE);

	ret = mgag200_vga_bmc_output_init(mdev);
	if (ret)
	return ret;

	return 0;
	}

	/*
	* DRM device
	*/

	static const struct mgag200_device_info mgag200_g200wb_device_info =
	MGAG200_DEVICE_INFO_INIT(1280, 1024, 31877, true, 0, 1, false);

	static const struct mgag200_device_funcs mgag200_g200wb_device_funcs = {
	.pixpllc_atomic_check = mgag200_g200wb_pixpllc_atomic_check,
	.pixpllc_atomic_update = mgag200_g200wb_pixpllc_atomic_update,
	};

	struct mga_device mgag200_g200wb_device_create(struct pci_dev pdev, const struct drm_driver *drv)
	{
	struct mga_device *mdev;
	struct drm_device *dev;
	resource_size_t vram_available;
	int ret;

	mdev = devm_drm_dev_alloc(&pdev->dev, drv, struct mga_device, base);
	if (IS_ERR(mdev))
	return mdev;
	dev = &mdev->base;

	pci_set_drvdata(pdev, dev);

	ret = mgag200_init_pci_options(pdev, 0x41049120, 0x0000b000);
	if (ret)
	return ERR_PTR(ret);

	ret = mgag200_device_preinit(mdev);
	if (ret)
	return ERR_PTR(ret);

	ret = mgag200_device_init(mdev, &mgag200_g200wb_device_info,
	&mgag200_g200wb_device_funcs);
	if (ret)
	return ERR_PTR(ret);

	mgag200_g200wb_init_registers(mdev);

	vram_available = mgag200_device_probe_vram(mdev);

	ret = mgag200_mode_config_init(mdev, vram_available);
	if (ret)
	return ERR_PTR(ret);

	ret = mgag200_g200wb_pipeline_init(mdev);
	if (ret)
	return ERR_PTR(ret);

	drm_mode_config_reset(dev);
	drm_kms_helper_poll_init(dev);

	ret = drm_vblank_init(dev, 1);
	if (ret)
	return ERR_PTR(ret);

	return mdev;
	}