Re: [PATCH 0/7] Raspberry Pi spi0 improvements

[kernel@xxxxxxxxxxxxxxxx]

Patches: 1-5:
Reviewed-By: Martin Sperl <kernel@xxxxxxxxxxxxxxxx>

> On 08.11.2018, at 08:06, Lukas Wunner <lukas@xxxxxxxxx> wrote:
> 
> Here's a first batch of improvements for the spi0 master on the
> Raspberry Pi.  The meat of the series is in its last two patches:
> 
> * Patch [6/7] allows DMA for transfer buffers starting at an offset not a
>  multiple of 4.  This overcomes a limitation affecting Ethernet drivers
>  such as ks8851 which call netdev_alloc_skb_ip_align() to allocate
>  deliberately unaligned receive buffers.
> 
> * Patch [7/7] speeds up PIO transfers by not polling the RX FIFO when it
>  is known to contain data, or the TX FIFO when it is known to have free
>  space.
> 
> The preceding patches fix rarely encountered bugs, remove obsolete code
> and add documentation.
> 
> The series has been tested extensively on the "Revolution Pi" family of
> open source PLCs (https://revolution.kunbus.com/), but further testing
> would be welcome to raise the confidence.
> 
> Thanks,
> 
> Lukas
> 
> 
> Lukas Wunner (7):
>  spi: bcm2835: Avoid finishing transfer prematurely in IRQ mode
>  spi: bcm2835: Fix book-keeping of DMA termination
>  spi: bcm2835: Fix race on DMA termination
>  spi: bcm2835: Drop unused code for native Chip Select
>  spi: bcm2835: Document struct bcm2835_spi
>  spi: bcm2835: Overcome sglist entry length limitation
>  spi: bcm2835: Speed up FIFO access if fill level is known
> 
> drivers/spi/spi-bcm2835.c | 478 ++++++++++++++++++++++++++------------
> 1 file changed, 334 insertions(+), 144 deletions(-)
> 
> -- 
> 2.19.1
>