kernel/linux.git/drivers/spi/internals.h, branch v7.0.10

spi: Rework per message DMA mapped flag to be per transfer

2024-06-10T11:49:03+00:00

The granularity of DMA mappings is transfer and moreover, the direction is also important as it can be unidirect. The current cur_msg_mapped flag doesn't fit well the DMA mapping and syncing calls and we have tons of checks around on top of it. So, instead of doing that rework the code to use per transfer per direction flag to show if it's DMA mapped or not. Signed-off-by: Andy Shevchenko Tested-by: Neil Armstrong # on SM8650-QRD Link: https://lore.kernel.org/r/20240531194723.1761567-9-andriy.shevchenko@linux.intel.com Reviewed-by: Serge Semin Tested-by: Nícolas F. R. A. Prado Signed-off-by: Mark Brown

spi: Introduce internal spi_xfer_is_dma_mapped() helper

2024-06-10T11:48:57+00:00

There are few drivers that use the same pattern to check if the transfer is DMA mapped or not. Provide a helper. Signed-off-by: Andy Shevchenko Tested-by: Neil Armstrong # on SM8650-QRD Link: https://lore.kernel.org/r/20240531194723.1761567-2-andriy.shevchenko@linux.intel.com Reviewed-by: Bryan O'Donoghue Reviewed-by: Serge Semin Tested-by: Nícolas F. R. A. Prado Signed-off-by: Mark Brown

spi: Add an helper to flush the message queue

2018-04-23T14:48:18+00:00

This is needed by the spi-mem logic to force all messages that have been queued before a memory operation to be sent before we start the memory operation. We do that in order to guarantee that spi-mem operations do not preempt regular SPI transfers. Signed-off-by: Boris Brezillon Signed-off-by: Mark Brown

spi: Expose spi_{map,unmap}_buf() for internal use

2018-04-23T14:48:06+00:00

spi_{map,unmap}_buf() are needed by the spi-mem logic that is about to be introduced to prepare data buffer for DMA operations. Remove the static specifier on these functions and add their prototypes to drivers/spi/internals.h. We do not export the symbols here because both SPI_MEM and SPI can't be enabled as modules and we'd like to prevent controller/device drivers from using these functions. Signed-off-by: Boris Brezillon Signed-off-by: Mark Brown