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The device_terminate_all() callback for this driver stops current DMA operations by clearing RUNSTOP bit in the control register and waiting HALTED bit set in the status register. But AXI CDMA which is one of the supported DMA engine by this driver does not provide the run / stop controls and those bits in the control and status registers are reserved. So when device_terminate_all() is called, the error message is printed and the channel is marked as having errors in xilinx_dma_halt(). This change adds stop_transfer() callback which differentiates CDMA and other DMA engine. The CDMA's one avoids the unsupported operations and instead polls the status register to check if the DMA operations are in progress for AXI CDMA. Cc: Vinod Koul <vinod.koul@intel.com> Cc: Kedareswara rao Appana <appana.durga.rao@xilinx.com> Cc: Michal Simek <monstr@monstr.eu> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.