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drm/nv30: Workaround dual TMDS brain damage.

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Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Francisco Jerez 2010-07-25 19:13:43 +02:00 committed by Ben Skeggs
parent bfe9dbcfc6
commit 2d14e35c95
1 changed files with 35 additions and 4 deletions
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39
drivers/gpu/drm/nouveau/nv04_dfp.c
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@ -146,6 +146,36 @@ void nv04_dfp_update_fp_control(struct drm_encoder *encoder, int mode)
}
}
static struct drm_encoder *get_tmds_slave(struct drm_encoder *encoder)
{
struct drm_device *dev = encoder->dev;
struct dcb_entry *dcb = nouveau_encoder(encoder)->dcb;
struct drm_encoder *slave;
if (dcb->type != OUTPUT_TMDS || dcb->location == DCB_LOC_ON_CHIP)
return NULL;
/* Some BIOSes (e.g. the one in a Quadro FX1000) report several
* TMDS transmitters at the same I2C address, in the same I2C
* bus. This can still work because in that case one of them is
* always hard-wired to a reasonable configuration using straps,
* and the other one needs to be programmed.
*
* I don't think there's a way to know which is which, even the
* blob programs the one exposed via I2C for *both* heads, so
* let's do the same.
*/
list_for_each_entry(slave, &dev->mode_config.encoder_list, head) {
struct dcb_entry *slave_dcb = nouveau_encoder(slave)->dcb;
if (slave_dcb->type == OUTPUT_TMDS && get_slave_funcs(slave) &&
slave_dcb->tmdsconf.slave_addr == dcb->tmdsconf.slave_addr)
return slave;
}
return NULL;
}
static bool nv04_dfp_mode_fixup(struct drm_encoder *encoder,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
@ -432,9 +462,9 @@ static void nv04_dfp_commit(struct drm_encoder *encoder)
NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + nv04_dac_output_offset(encoder), 0x00100000);
/* Init external transmitters */
if (get_slave_funcs(encoder))
get_slave_funcs(encoder)->mode_set(encoder, &nv_encoder->mode,
&nv_encoder->mode);
if (get_tmds_slave(encoder))
get_slave_funcs(get_tmds_slave(encoder))->mode_set(
encoder, &nv_encoder->mode, &nv_encoder->mode);
helper->dpms(encoder, DRM_MODE_DPMS_ON);
@ -581,7 +611,8 @@ static void nv04_tmds_slave_init(struct drm_encoder *encoder)
};
int type;
if (!nv_gf4_disp_arch(dev) || !i2c)
if (!nv_gf4_disp_arch(dev) || !i2c ||
get_tmds_slave(encoder))
return;
type = nouveau_i2c_identify(dev, "TMDS transmitter", info, 2);