From: Hersen Wu Date: Mon, 23 Apr 2018 23:21:45 +0000 (-0400) Subject: drm/amd/display: AUX will exit when HPD LOW detected X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=73770ca53f63489b32175ab8b5ddd4632b747275;p=linux.git 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 Reviewed-by: Tony Cheng Reviewed-by: Harry Wentland Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/display/dc/i2caux/aux_engine.c b/drivers/gpu/drm/amd/display/dc/i2caux/aux_engine.c index bb526ad326e59..1d7309611978e 100644 --- a/drivers/gpu/drm/amd/display/dc/i2caux/aux_engine.c +++ b/drivers/gpu/drm/amd/display/dc/i2caux/aux_engine.c @@ -157,6 +157,10 @@ static void process_read_reply( ctx->operation_succeeded = false; } break; + case AUX_TRANSACTION_REPLY_HPD_DISCON: + ctx->status = I2CAUX_TRANSACTION_STATUS_FAILED_HPD_DISCON; + ctx->operation_succeeded = false; + break; default: ctx->status = I2CAUX_TRANSACTION_STATUS_UNKNOWN; ctx->operation_succeeded = false; @@ -215,6 +219,10 @@ static void process_read_request( * so we should not wait here */ } break; + case AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON: + ctx->status = I2CAUX_TRANSACTION_STATUS_FAILED_HPD_DISCON; + ctx->operation_succeeded = false; + break; default: ctx->status = I2CAUX_TRANSACTION_STATUS_UNKNOWN; ctx->operation_succeeded = false; @@ -370,6 +378,10 @@ static void process_write_reply( ctx->operation_succeeded = false; } break; + case AUX_TRANSACTION_REPLY_HPD_DISCON: + ctx->status = I2CAUX_TRANSACTION_STATUS_FAILED_HPD_DISCON; + ctx->operation_succeeded = false; + break; default: ctx->status = I2CAUX_TRANSACTION_STATUS_UNKNOWN; ctx->operation_succeeded = false; @@ -422,6 +434,10 @@ static void process_write_request( * so we should not wait here */ } break; + case AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON: + ctx->status = I2CAUX_TRANSACTION_STATUS_FAILED_HPD_DISCON; + ctx->operation_succeeded = false; + break; default: ctx->status = I2CAUX_TRANSACTION_STATUS_UNKNOWN; ctx->operation_succeeded = false; diff --git a/drivers/gpu/drm/amd/display/dc/i2caux/aux_engine.h b/drivers/gpu/drm/amd/display/dc/i2caux/aux_engine.h index 8e71324ccb109..b9e35d0474c6a 100644 --- a/drivers/gpu/drm/amd/display/dc/i2caux/aux_engine.h +++ b/drivers/gpu/drm/amd/display/dc/i2caux/aux_engine.h @@ -51,6 +51,8 @@ enum aux_transaction_reply { AUX_TRANSACTION_REPLY_I2C_NACK = 0x10, AUX_TRANSACTION_REPLY_I2C_DEFER = 0x20, + AUX_TRANSACTION_REPLY_HPD_DISCON = 0x40, + AUX_TRANSACTION_REPLY_INVALID = 0xFF }; @@ -64,7 +66,8 @@ enum aux_channel_operation_result { AUX_CHANNEL_OPERATION_SUCCEEDED, AUX_CHANNEL_OPERATION_FAILED_REASON_UNKNOWN, AUX_CHANNEL_OPERATION_FAILED_INVALID_REPLY, - AUX_CHANNEL_OPERATION_FAILED_TIMEOUT + AUX_CHANNEL_OPERATION_FAILED_TIMEOUT, + AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON }; struct aux_engine; 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 90535787a4618..2b927f25937b4 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; } } diff --git a/drivers/gpu/drm/amd/display/dc/i2caux/engine.h b/drivers/gpu/drm/amd/display/dc/i2caux/engine.h index 33de8a8834dc1..c1109706a8808 100644 --- a/drivers/gpu/drm/amd/display/dc/i2caux/engine.h +++ b/drivers/gpu/drm/amd/display/dc/i2caux/engine.h @@ -53,7 +53,8 @@ enum i2caux_transaction_status { I2CAUX_TRANSACTION_STATUS_FAILED_INCOMPLETE, I2CAUX_TRANSACTION_STATUS_FAILED_OPERATION, I2CAUX_TRANSACTION_STATUS_FAILED_INVALID_OPERATION, - I2CAUX_TRANSACTION_STATUS_FAILED_BUFFER_OVERFLOW + I2CAUX_TRANSACTION_STATUS_FAILED_BUFFER_OVERFLOW, + I2CAUX_TRANSACTION_STATUS_FAILED_HPD_DISCON }; struct i2caux_transaction_request { diff --git a/drivers/gpu/drm/amd/display/include/ddc_service_types.h b/drivers/gpu/drm/amd/display/include/ddc_service_types.h index 019e7a095ea10..d968956a10cd5 100644 --- a/drivers/gpu/drm/amd/display/include/ddc_service_types.h +++ b/drivers/gpu/drm/amd/display/include/ddc_service_types.h @@ -40,7 +40,8 @@ enum ddc_result { DDC_RESULT_FAILED_INCOMPLETE, DDC_RESULT_FAILED_OPERATION, DDC_RESULT_FAILED_INVALID_OPERATION, - DDC_RESULT_FAILED_BUFFER_OVERFLOW + DDC_RESULT_FAILED_BUFFER_OVERFLOW, + DDC_RESULT_FAILED_HPD_DISCON }; enum ddc_service_type {