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drm/amd/display: USB-C / thunderbolt dock specific workaround 

reading dpcd 0x600 cause link loss for a particular USB-C dock with
thurderbolt.  workaround by avoiding dcpd 0x600 read unless it's
necessary.

Signed-off-by: Hersen Wu <hersenxs.wu@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:
Hersen Wu 2017-11-20 12:45:54 -05:00 committed by Alex Deucher
parent 320a127437
commit 97011249c3
1 changed files with 40 additions and 45 deletions
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85
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
View File

@ -1512,7 +1512,7 @@ static bool hpd_rx_irq_check_link_loss_status(
struct dc_link *link,
union hpd_irq_data *hpd_irq_dpcd_data)
{
uint8_t irq_reg_rx_power_state;
uint8_t irq_reg_rx_power_state = 0;
enum dc_status dpcd_result = DC_ERROR_UNEXPECTED;
union lane_status lane_status;
uint32_t lane;
@ -1524,60 +1524,55 @@ static bool hpd_rx_irq_check_link_loss_status(
if (link->cur_link_settings.lane_count == 0)
return return_code;
/*1. Check that we can handle interrupt: Not in FS DOS,
* Not in "Display Timeout" state, Link is trained.
*/
dpcd_result = core_link_read_dpcd(link,
DP_SET_POWER,
&irq_reg_rx_power_state,
sizeof(irq_reg_rx_power_state));
/*1. Check that Link Status changed, before re-training.*/
if (dpcd_result != DC_OK) {
irq_reg_rx_power_state = DP_SET_POWER_D0;
dm_logger_write(link->ctx->logger, LOG_HW_HPD_IRQ,
"%s: DPCD read failed to obtain power state.\n",
__func__);
/*parse lane status*/
for (lane = 0; lane < link->cur_link_settings.lane_count; lane++) {
/* check status of lanes 0,1
* changed DpcdAddress_Lane01Status (0x202)
*/
lane_status.raw = get_nibble_at_index(
&hpd_irq_dpcd_data->bytes.lane01_status.raw,
lane);
if (!lane_status.bits.CHANNEL_EQ_DONE_0 ||
!lane_status.bits.CR_DONE_0 ||
!lane_status.bits.SYMBOL_LOCKED_0) {
/* if one of the channel equalization, clock
* recovery or symbol lock is dropped
* consider it as (link has been
* dropped) dp sink status has changed
*/
sink_status_changed = true;
break;
}
}
if (irq_reg_rx_power_state == DP_SET_POWER_D0) {
/* Check interlane align.*/
if (sink_status_changed ||
!hpd_irq_dpcd_data->bytes.lane_status_updated.bits.INTERLANE_ALIGN_DONE) {
/*2. Check that Link Status changed, before re-training.*/
dm_logger_write(link->ctx->logger, LOG_HW_HPD_IRQ,
"%s: Link Status changed.\n", __func__);
/*parse lane status*/
for (lane = 0;
lane < link->cur_link_settings.lane_count;
lane++) {
return_code = true;
/* check status of lanes 0,1
* changed DpcdAddress_Lane01Status (0x202)*/
lane_status.raw = get_nibble_at_index(
&hpd_irq_dpcd_data->bytes.lane01_status.raw,
lane);
if (!lane_status.bits.CHANNEL_EQ_DONE_0 ||
!lane_status.bits.CR_DONE_0 ||
!lane_status.bits.SYMBOL_LOCKED_0) {
/* if one of the channel equalization, clock
* recovery or symbol lock is dropped
* consider it as (link has been
* dropped) dp sink status has changed*/
sink_status_changed = true;
break;
}
}
/* Check interlane align.*/
if (sink_status_changed ||
!hpd_irq_dpcd_data->bytes.lane_status_updated.bits.
INTERLANE_ALIGN_DONE) {
/*2. Check that we can handle interrupt: Not in FS DOS,
* Not in "Display Timeout" state, Link is trained.
*/
dpcd_result = core_link_read_dpcd(link,
DP_SET_POWER,
&irq_reg_rx_power_state,
sizeof(irq_reg_rx_power_state));
if (dpcd_result != DC_OK) {
dm_logger_write(link->ctx->logger, LOG_HW_HPD_IRQ,
"%s: Link Status changed.\n",
"%s: DPCD read failed to obtain power state.\n",
__func__);
return_code = true;
} else {
if (irq_reg_rx_power_state != DP_SET_POWER_D0)
return_code = false;
}
}