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drm/i915: Force sink crc stop before start.

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By Vesa DP spec, test counter at DP_TEST_SINK_MISC just reset to 0
when unsetting DP_TEST_SINK_START, so let's force this stop here.

But let's minimize the aux transactions and just do it when we know
it hasn't been properly stoped.

Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Rafael Antognolli <rafael.antognolli@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Rodrigo Vivi 2015-07-23 16:35:48 -07:00 committed by Daniel Vetter
parent c6d576cc57
commit e5a1cab5e5
2 changed files with 20 additions and 3 deletions
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22
drivers/gpu/drm/i915/intel_dp.c
View file

@ -3995,22 +3995,30 @@ intel_dp_probe_mst(struct intel_dp *intel_dp)
return intel_dp->is_mst;
}
static void intel_dp_sink_crc_stop(struct intel_dp *intel_dp)
static int intel_dp_sink_crc_stop(struct intel_dp *intel_dp)
{
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct intel_crtc *intel_crtc = to_intel_crtc(dig_port->base.base.crtc);
u8 buf;
int ret = 0;
if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) {
DRM_DEBUG_KMS("Sink CRC couldn't be stopped properly\n");
return;
ret = -EIO;
goto out;
}
if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK,
buf & ~DP_TEST_SINK_START) < 0)
buf & ~DP_TEST_SINK_START) < 0) {
DRM_DEBUG_KMS("Sink CRC couldn't be stopped properly\n");
ret = -EIO;
goto out;
}
intel_dp->sink_crc_started = false;
out:
hsw_enable_ips(intel_crtc);
return ret;
}
static int intel_dp_sink_crc_start(struct intel_dp *intel_dp)
@ -4018,6 +4026,13 @@ static int intel_dp_sink_crc_start(struct intel_dp *intel_dp)
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct intel_crtc *intel_crtc = to_intel_crtc(dig_port->base.base.crtc);
u8 buf;
int ret;
if (intel_dp->sink_crc_started) {
ret = intel_dp_sink_crc_stop(intel_dp);
if (ret)
return ret;
}
if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0)
return -EIO;
@ -4036,6 +4051,7 @@ static int intel_dp_sink_crc_start(struct intel_dp *intel_dp)
return -EIO;
}
intel_dp->sink_crc_started = true;
return 0;
}

1
drivers/gpu/drm/i915/intel_drv.h
View file

@ -713,6 +713,7 @@ struct intel_dp {
/* sink rates as reported by DP_SUPPORTED_LINK_RATES */
uint8_t num_sink_rates;
int sink_rates[DP_MAX_SUPPORTED_RATES];
bool sink_crc_started;
struct drm_dp_aux aux;
uint8_t train_set[4];
int panel_power_up_delay;