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| author | Nikola Cornij <nikola.cornij@amd.com> | 2018-05-09 17:07:36 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2018-06-15 12:20:25 -0500 |
| commit | 3c8e4316a0bf6f65e8fbcf777abbc3b0e629e800 (patch) | |
| tree | eadb1dfdac81204a94920d3da2d0fbd032c16a1d | |
| parent | bf58968647729ce320a7ef27077d60b7b2cdcd00 (diff) | |
| download | linux-3c8e4316a0bf6f65e8fbcf777abbc3b0e629e800.tar.gz linux-3c8e4316a0bf6f65e8fbcf777abbc3b0e629e800.zip | |
drm/amd/display: Optimize DP_SINK_STATUS_ESI range read on HPD
DP_SINK_STATUS_ESI range data is not continual, but rather than
getting it in two AUX reads, it's quicker to read more bytes in a
AUX read and then memcpy the required fields (it's only 8 more
bytes to read).
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>
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c index 1a42ee5113a9..509f265663d2 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c @@ -1647,22 +1647,26 @@ static enum dc_status read_hpd_rx_irq_data( irq_data->raw, sizeof(union hpd_irq_data)); else { - /* Read 2 bytes at this location,... */ + /* Read 14 bytes in a single read and then copy only the required fields. + * This is more efficient than doing it in two separate AUX reads. */ + + uint8_t tmp[DP_SINK_STATUS_ESI - DP_SINK_COUNT_ESI + 1]; + retval = core_link_read_dpcd( link, DP_SINK_COUNT_ESI, - irq_data->raw, - 2); + tmp, + sizeof(tmp)); 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); + irq_data->bytes.sink_cnt.raw = tmp[DP_SINK_COUNT_ESI - DP_SINK_COUNT_ESI]; + irq_data->bytes.device_service_irq.raw = tmp[DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0 - DP_SINK_COUNT_ESI]; + irq_data->bytes.lane01_status.raw = tmp[DP_LANE0_1_STATUS_ESI - DP_SINK_COUNT_ESI]; + irq_data->bytes.lane23_status.raw = tmp[DP_LANE2_3_STATUS_ESI - DP_SINK_COUNT_ESI]; + irq_data->bytes.lane_status_updated.raw = tmp[DP_LANE_ALIGN_STATUS_UPDATED_ESI - DP_SINK_COUNT_ESI]; + irq_data->bytes.sink_status.raw = tmp[DP_SINK_STATUS_ESI - DP_SINK_COUNT_ESI]; } return retval; |