On Intel platforms there is a strict order requirement for the DMA programming: DSP side configures the buffer and sets the GEN bit Host side sets the RUN bit.
In order to follow this flow, a new global message type has been added to prepare the DSP side of the DMA:
host sends LOAD_LIBRARY_PREPARE with the dma_id DSP side sets its buffer and sets the GEN bit Host sets the RUN bit Host sends LOAD_LIBRARY with dma_id and lib_id DSP receives the library data.
It is up to the platform code to use the new prepare stage message and how to handle the reply to it from the firmware, which can indicate that the message type is not supported/handled. In this case the kernel should proceed to the LOAD_LIBRARY stage assuming a single stage library loading:
host sends LOAD_LIBRARY_PREPARE with the dma_id DSP replies that the message type is not supported/handled Host acknowledges the return code and sets the RUN bit Host sends LOAD_LIBRARY with dma_id and lib_id DSP receives the library data.
Signed-off-by: Peter Ujfalusi peter.ujfalusi@linux.intel.com Reviewed-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Reviewed-by: Guennadi Liakhovetski guennadi.liakhovetski@linux.intel.com Reviewed-by: Ranjani Sridharan ranjani.sridharan@linux.intel.com Reviewed-by: Chao Song chao.song@linux.intel.com --- include/sound/sof/ipc4/header.h | 15 +++++++++++---- sound/soc/sof/ipc4.c | 1 + 2 files changed, 12 insertions(+), 4 deletions(-)
diff --git a/include/sound/sof/ipc4/header.h b/include/sound/sof/ipc4/header.h index 78568abe2673..c58f00ef054a 100644 --- a/include/sound/sof/ipc4/header.h +++ b/include/sound/sof/ipc4/header.h @@ -106,12 +106,19 @@ enum sof_ipc4_global_msg { SOF_IPC4_GLB_SAVE_PIPELINE, SOF_IPC4_GLB_RESTORE_PIPELINE,
- /* Loads library (using Code Load or HD/A Host Output DMA) */ + /* + * library loading + * + * Loads library (using Code Load or HD/A Host Output DMA) + */ SOF_IPC4_GLB_LOAD_LIBRARY, + /* + * Prepare the host DMA channel for library loading, must be followed by + * a SOF_IPC4_GLB_LOAD_LIBRARY message as the library loading step + */ + SOF_IPC4_GLB_LOAD_LIBRARY_PREPARE,
- /* 25: RESERVED - do not use */ - - SOF_IPC4_GLB_INTERNAL_MESSAGE = 26, + SOF_IPC4_GLB_INTERNAL_MESSAGE,
/* Notification (FW to SW driver) */ SOF_IPC4_GLB_NOTIFICATION, diff --git a/sound/soc/sof/ipc4.c b/sound/soc/sof/ipc4.c index 24e9c29f3579..e14924048eb5 100644 --- a/sound/soc/sof/ipc4.c +++ b/sound/soc/sof/ipc4.c @@ -157,6 +157,7 @@ static const char * const ipc4_dbg_glb_msg_type[] = { DBG_IPC4_MSG_TYPE_ENTRY(GLB_SAVE_PIPELINE), DBG_IPC4_MSG_TYPE_ENTRY(GLB_RESTORE_PIPELINE), DBG_IPC4_MSG_TYPE_ENTRY(GLB_LOAD_LIBRARY), + DBG_IPC4_MSG_TYPE_ENTRY(GLB_LOAD_LIBRARY_PREPARE), DBG_IPC4_MSG_TYPE_ENTRY(GLB_INTERNAL_MESSAGE), DBG_IPC4_MSG_TYPE_ENTRY(GLB_NOTIFICATION), };