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Re: [PATCH v2 2/2] spi: spi-ti-qspi: Use bounce buffer if read buffer is not DMA'ble

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On Tue, Apr 11, 2017 at 05:22:25PM +0530, Vignesh R wrote:
> Flash filesystems like JFFS2, UBIFS and MTD block layer can provide
> vmalloc'd or kmap'd buffers that cannot be mapped using dma_map_sg() and
> can potentially be in memory region above 32bit addressable region(ie
> buffers belonging to memory region backed by LPAE) of DMA, implement
> spi_flash_can_dma() interface to inform SPI core not to map such
> buffers.

I'll apply this since it fixes bugs for your systems but it feels like
something that we should be moving further into the core since LPAE
isn't specific to your devices.  We should ideally have something
(possibly in the DMA mapping code even) which does the remapping without
the driver needing to know about it.

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[PATCH v2 0/2] spi-ti-qspi: Handle vmalloc'd buffers Vignesh R <vigneshr@ti.com> - 2017-04-11 14:00 +0200
  [PATCH v2 2/2] spi: spi-ti-qspi: Use bounce buffer if read buffer is not DMA'ble Vignesh R <vigneshr@ti.com> - 2017-04-11 14:00 +0200
    Applied "spi: spi-ti-qspi: Use bounce buffer if read buffer is not DMA'ble" to the spi tree Mark Brown <broonie@kernel.org> - 2017-04-21 20:30 +0200
    Re: [PATCH v2 2/2] spi: spi-ti-qspi: Use bounce buffer if read  buffer is not DMA'ble Mark Brown <broonie@kernel.org> - 2017-04-21 20:40 +0200

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