GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-23 23:21:46 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

drm/amd/display: Read DP_SINK_COUNT_ESI range on HPD for DP 1.4

Browse source 
DP 1.4 compliance now requires that registers at DP_SINK_COUNT_ESI range
(0x2002-0x2003, 0x200c-0x200f) are read instead of DP_SINK_COUNT range
(0x200-0x2005.

Signed-off-by: Nikola Cornij <nikola.cornij@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nikola Cornij 2018-05-09 13:11:35 -04:00 • committed by Alex Deucher
parent 794550c6ea
commit c733e40c74
1 changed files with 30 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

27
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
View file

@ -1630,17 +1630,42 @@ static enum dc_status read_hpd_rx_irq_data(
struct dc_link *link,
union hpd_irq_data *irq_data)
{
static enum dc_status retval;
/* The HW reads 16 bytes from 200h on HPD,
* but if we get an AUX_DEFER, the HW cannot retry
* and this causes the CTS tests 4.3.2.1 - 3.2.4 to
* fail, so we now explicitly read 6 bytes which is
* the req from the above mentioned test cases.
*
* For DP 1.4 we need to read those from 2002h range.
*/
return core_link_read_dpcd(
if (link->dpcd_caps.dpcd_rev.raw < DPCD_REV_14)
retval = core_link_read_dpcd(
link,
DP_SINK_COUNT,
irq_data->raw,
sizeof(union hpd_irq_data));
else {
/* Read 2 bytes at this location,... */
retval = core_link_read_dpcd(
link,
DP_SINK_COUNT_ESI,
irq_data->raw,
2);
if (retval != DC_OK)
return retval;
/* ... then read remaining 4 at the other location */
retval = core_link_read_dpcd(
link,
DP_LANE0_1_STATUS_ESI,
&irq_data->raw[2],
4);
}
return retval;
}
static bool allow_hpd_rx_irq(const struct dc_link *link)