drm/nouveau/mxm: implement ROM shadow method

	mxms_foreach(dev, 0x01, mxm_show_unmatched, NULL);

}

static bool

mxm_shadow_rom_fetch(struct nouveau_i2c_chan *i2c, u8 addr,

		     u8 offset, u8 size, u8 *data)

{

	struct i2c_msg msgs[] = {

		{ .addr = addr, .flags = 0, .len = 1, .buf = &offset },

		{ .addr = addr, .flags = I2C_M_RD, .len = size, .buf = data, },

	};

	return i2c_transfer(&i2c->adapter, msgs, 2) == 2;

}

static bool

mxm_shadow_rom(struct drm_device *dev, u8 version)

{

	struct drm_nouveau_private *dev_priv = dev->dev_private;

	struct nouveau_i2c_chan *i2c = NULL;

	u8 i2cidx, mxms[6], addr, size;

	i2cidx = mxm_ddc_map(dev, 1 /* LVDS_DDC */) & 0x0f;

	if (i2cidx < 0x0f)

		i2c = nouveau_i2c_find(dev, i2cidx);

	if (!i2c)

		return false;

	addr = 0x54;

	if (!mxm_shadow_rom_fetch(i2c, addr, 0, 6, mxms)) {

		addr = 0x56;

		if (!mxm_shadow_rom_fetch(i2c, addr, 0, 6, mxms))

			return false;

	}

	dev_priv->mxms = mxms;

	size = mxms_headerlen(dev) + mxms_structlen(dev);

	dev_priv->mxms = kmalloc(size, GFP_KERNEL);

	if (dev_priv->mxms &&

	    mxm_shadow_rom_fetch(i2c, addr, 0, size, dev_priv->mxms))

		return true;

	kfree(dev_priv->mxms);

	dev_priv->mxms = NULL;

	return false;

}