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drm/radeon/kms: always do extended edid probe

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Rather than having a quirk list just always check the EDID header
when probing.  This is the recommended behavior according to the
display team.  This avoids problems with improperly terminated
i2c lines on some boards.  This is also what the proprietary
driver does.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alex Deucher
2011-10-30 16:54:27 -04:00
committed by Dave Airlie
parent fab249ed97
commit bc1c4dc390
3 changed files with 18 additions and 85 deletions
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28
drivers/gpu/drm/radeon/radeon_i2c.c
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@@ -32,7 +32,7 @@
* radeon_ddc_probe
*
*/
bool radeon_ddc_probe(struct radeon_connector *radeon_connector, bool requires_extended_probe)
bool radeon_ddc_probe(struct radeon_connector *radeon_connector)
{
u8 out = 0x0;
u8 buf[8];
@@ -47,15 +47,11 @@ bool radeon_ddc_probe(struct radeon_connector *radeon_connector, bool requires_e
{
.addr = 0x50,
.flags = I2C_M_RD,
.len = 1,
.len = 8,
.buf = buf,
}
};
/* Read 8 bytes from i2c for extended probe of EDID header */
if (requires_extended_probe)
msgs[1].len = 8;
/* on hw with routers, select right port */
if (radeon_connector->router.ddc_valid)
radeon_router_select_ddc_port(radeon_connector);
@@ -64,17 +60,15 @@ bool radeon_ddc_probe(struct radeon_connector *radeon_connector, bool requires_e
if (ret != 2)
/* Couldn't find an accessible DDC on this connector */
return false;
if (requires_extended_probe) {
/* Probe also for valid EDID header
* EDID header starts with:
* 0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00.
* Only the first 6 bytes must be valid as
* drm_edid_block_valid() can fix the last 2 bytes */
if (drm_edid_header_is_valid(buf) < 6) {
/* Couldn't find an accessible EDID on this
* connector */
return false;
}
/* Probe also for valid EDID header
* EDID header starts with:
* 0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00.
* Only the first 6 bytes must be valid as
* drm_edid_block_valid() can fix the last 2 bytes */
if (drm_edid_header_is_valid(buf) < 6) {
/* Couldn't find an accessible EDID on this
* connector */
return false;
}
return true;
}