[BISECTED] v4.9: OMAP MMC regression

[Peter Ujfalusi]

On 12/22/2016 10:58 PM, Aaro Koskinen wrote:
> Hi,
> 
> On Sun, Dec 18, 2016 at 12:01:21AM +0200, Aaro Koskinen wrote:
>> OMAP MMC is silently missing when booting v4.9 on Nokia 770 (OMAP1).
>>
>> Bisected to:
>>
>> commit 2d1a9a946faebfedd660a1f1c2b90984fff41f91
>> Author: Peter Ujfalusi <peter.ujfalusi at ti.com>
>> Date:   Wed Jul 20 11:50:29 2016 +0300
>>
>>     dmaengine: omap-dma: Dynamically allocate memory for lch_map
>>
>> Reveting the commit makes MMC to appear and work again...
> 
> This commit basically reduces dma_requests count to 17 (from 127)
> on OMAP1.
> 
> This cannot be correct, since OMAP1 MMC is using requests (from
> omap1_init_mmc):
> 
>                         rx_req = 22;
>                         tx_req = 21;
> [...]
>                         rx_req = 55;
>                         tx_req = 54;
> 
> MMC probe will fail because omap_dma_filter_fn() will fail during
> dma_request_chan().
> 
> I think 2d1a9a946faebfedd660a1f1c2b90984fff41f91 should be reverted.
> I cannot anymore boot my 770 with >= 4.9 kernel.

I rather fix this instead of reverting the commit, I will send a patch
today for this.

-- 
Péter