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Subject: Re: [virtio-comment] [PATCH] [PATCH v5] virtio-spi: add the device specification
On 29-11-23, 18:31, Haixu Cui wrote: > Hi Viresh, > > Thank you for your helpful comments. In next patch, I will clearly point > this out: Great, finally we are on the same page. Thanks Haixu. > "For full-duplex read and write transfer, both \field{tx_buf} and > \field{rx_buf} are used and the buffer size of \field{tx_buf} must be same > as \field{rx_buf}." Suggest rewriting as: In full-duplex transfer mode, both \field{tx_buf} and \field{rx_buf} are sent by the driver, \field{tx_buf} followed by \field{rx_buf}. The length of both the buffers MUST be same. > And in drivernormative section, I will add a requirement: > "For full-duplex transfer, Virtio SPI driver MUST guarantee the write > transfer size is equal to the read transfer size" Maybe: drivernormative: In full-duplex transfer mode, the Virtio SPI driver MUST guarantee that the length of both \field{tx_buf} and \field{rx_buf} are same. devicenormative: In full-duplex transfer mode, the Virtio SPI device MUST verify that the length of both \field{tx_buf} and \field{rx_buf} are same. In case of any mismatch, the device MUST fail the transfer and notify the driver. > In fact, in my prototype, I only perform the transfers with same tx/rx > length. Great. Thanks. -- viresh
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