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| author |   Hersen Wu <hersenxs.wu@amd.com> | 2018-04-23 19:21:45 -0400 |
|---|---|---|
| committer |   Alex Deucher <alexander.deucher@amd.com> | 2018-06-15 12:20:23 -0500 |
| commit | 73770ca53f63489b32175ab8b5ddd4632b747275 (patch) | |
| tree | dc4176df0dcfdde5d9cf5eb07566d34b89067dff /drivers/gpu/drm/amd/display/dc/i2caux/dce110 | |
| parent | drm/amd/display: Prefix event prints with ==Event== (diff) | |
| download | linux-dev-73770ca53f63489b32175ab8b5ddd4632b747275.tar.xz linux-dev-73770ca53f63489b32175ab8b5ddd4632b747275.zip | |
drm/amd/display: AUX will exit when HPD LOW detected
This change shorten wait time when HPD LOW. With HPD LOW, without this
change, AUX routine delay is 450us. With this change, it is 42us.
Signed-off-by: Hersen Wu <hersenxs.wu@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/i2caux/dce110')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/i2caux/dce110/aux_engine_dce110.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/i2caux/dce110/aux_engine_dce110.c b/drivers/gpu/drm/amd/display/dc/i2caux/dce110/aux_engine_dce110.c index 90535787a461..2b927f25937b 100644 --- a/drivers/gpu/drm/amd/display/dc/i2caux/dce110/aux_engine_dce110.c +++ b/drivers/gpu/drm/amd/display/dc/i2caux/dce110/aux_engine_dce110.c @@ -291,6 +291,12 @@ static void process_channel_reply( value = REG_GET(AUX_SW_STATUS, AUX_SW_REPLY_BYTE_COUNT, &bytes_replied); + /* in case HPD is LOW, exit AUX transaction */ + if ((value & AUX_SW_STATUS__AUX_SW_HPD_DISCON_MASK)) { + reply->status = AUX_TRANSACTION_REPLY_HPD_DISCON; + return; + } + if (bytes_replied) { uint32_t reply_result; @@ -347,8 +353,10 @@ static void process_channel_reply( * because there was surely an error that was asserted * that should have been handled * for hot plug case, this could happens*/ - if (!(value & AUX_SW_STATUS__AUX_SW_HPD_DISCON_MASK)) + if (!(value & AUX_SW_STATUS__AUX_SW_HPD_DISCON_MASK)) { + reply->status = AUX_TRANSACTION_REPLY_INVALID; ASSERT_CRITICAL(false); + } } } @@ -371,6 +379,10 @@ static enum aux_channel_operation_result get_channel_status( value = REG_WAIT(AUX_SW_STATUS, AUX_SW_DONE, 1, 10, aux110->timeout_period/10); + /* in case HPD is LOW, exit AUX transaction */ + if ((value & AUX_SW_STATUS__AUX_SW_HPD_DISCON_MASK)) + return AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON; + /* Note that the following bits are set in 'status.bits' * during CTS 4.2.1.2 (FW 3.3.1): * AUX_SW_RX_MIN_COUNT_VIOL, AUX_SW_RX_INVALID_STOP, @@ -402,10 +414,10 @@ static enum aux_channel_operation_result get_channel_status( return AUX_CHANNEL_OPERATION_SUCCEEDED; } } else { - /*time_elapsed >= aux_engine->timeout_period */ - if (!(value & AUX_SW_STATUS__AUX_SW_HPD_DISCON_MASK)) - ASSERT_CRITICAL(false); - + /*time_elapsed >= aux_engine->timeout_period + * AUX_SW_STATUS__AUX_SW_HPD_DISCON = at this point + */ + ASSERT_CRITICAL(false); return AUX_CHANNEL_OPERATION_FAILED_TIMEOUT; } } |