2017-11-09 18:14 GMT+08:00 Arnd Bergmann :
> On Thu, Nov 9, 2017 at 8:12 AM, Greentime Hu wrote:
>> 2017-11-08 17:09 GMT+08:00 Arnd Bergmann :
>>> On Wed, Nov 8, 2017 at 6:55 AM, Greentime Hu wrote:
>>>
>
>>> You do the same cache operations for _to_cpu and _to_device, which
>>> usually works,
>>
On Thu, Nov 9, 2017 at 8:12 AM, Greentime Hu wrote:
> 2017-11-08 17:09 GMT+08:00 Arnd Bergmann :
>> On Wed, Nov 8, 2017 at 6:55 AM, Greentime Hu wrote:
>>
>> You do the same cache operations for _to_cpu and _to_device, which
>> usually works,
>> but is more expensive than you need. It's better t
2017-11-08 17:09 GMT+08:00 Arnd Bergmann :
> On Wed, Nov 8, 2017 at 6:55 AM, Greentime Hu wrote:
>
>> +static void consistent_sync(void *vaddr, size_t size, int direction)
>> +{
>> + unsigned long start = (unsigned long)vaddr;
>> + unsigned long end = start + size;
>> +
>> + swit
On Wed, Nov 8, 2017 at 6:55 AM, Greentime Hu wrote:
> +static void consistent_sync(void *vaddr, size_t size, int direction)
> +{
> + unsigned long start = (unsigned long)vaddr;
> + unsigned long end = start + size;
> +
> + switch (direction) {
> + case DMA_FROM_DEVICE: /
