Hi Melinda,
the problem in my case was caused by the following instructions to allocate the
buffers for SPI controller tx and rx:
rxbuffer = (u8*)m8xx_cpm_hostalloc(SPI_MAX_BUFFER_SIZE);
txbuffer = (u8*)m8xx_cpm_hostalloc(SPI_MAX_BUFFER_SIZE);
// Set the bd's rx and tx buffer address pointers
rbdf->cbd_bufaddr = virt_to_bus((void *)rxbuffer);
tbdf->cbd_bufaddr = virt_to_bus((void *)txbuffer);
I don't know why (I'm asking an opinion to Vitaly Bordug), I replaced the
allocation of rx and tx buffers with:
...->cbd_bufaddr = __pa(__get_free_page(GFP_KERNEL | GFP_DMA))
but it will better to use dma_alloc_coherent.
In my case the use of m8xx_cpm_hostalloc led to an immediate kernel hang after
giving the start command to the spi controller.
Bye,
Antonio.
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