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On prep, a spin lock is taken and the next entry in the circular buffer is filled. On submit, the spin lock just needs to be released as the requests are already pending. When switchtec_dma_issue_pending() is called, the sq_tail register is written to indicate there are new jobs for the dma engine to start on. Pause and resume operations are implemented by writing to a control register. Signed-off-by: Kelvin Cao <kelvin.cao@microchip.com> Co-developed-by: George Ge <george.ge@microchip.com> Signed-off-by: George Ge <george.ge@microchip.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Link: https://patch.msgid.link/20260302210419.3656-4-logang@deltatee.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
1437 lines
37 KiB
1437 lines
37 KiB