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drm/nouveau/mxm: implement ROM shadow method

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Untested, -ENOHW.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2011-11-07 16:16:24 +10:00
parent 3952315b9d
commit c37e99050c
1 changed files with 39 additions and 0 deletions
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39
drivers/gpu/drm/nouveau/nouveau_mxm.c
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@ -470,9 +470,48 @@ mxm_dcb_sanitise(struct drm_device *dev)
mxms_foreach(dev, 0x01, mxm_show_unmatched, NULL); 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 static bool
mxm_shadow_rom(struct drm_device *dev, u8 version) 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; return false;
} }