Re: [PATCH] pata_sl82c105: wrong assumptions about compatible PIO modes

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On Tue, 30 Jan 2007 20:40:30 +0300
Sergei Shtylyov <sshtylyov@xxxxxxxxxxxxx> wrote:

> Fix the wrong "compatible" PIO mode choices: MWDMA0 has 480 ns cycle while PIO1
> only has 383 ns cycle, and MWDMA2 timings matchs those of PIO4 exactly.

Thanks for all this review work

> Frankly speaking, I'm not sure this function is useful or correct at all --
> with the DMA timings being actually programmed in sl82c105_bmdma_start()...

It ought to be right
- bmdma_start loads the real DMA mode
- set_dmamode/set_piomode load the right PIO timings
- bmdma_stop restores the right PIO timings

> And the issue of the same registers being used for both PIO and DMA timings is
> not specific for this driver at all but seems to be addressed only by it...

For most drivers (those using the ata_timing interface) the timing merge
is done by ata_timing_compute(). 

> Signed-off-by: Sergei Shtylyov <sshtylyov@xxxxxxxxxxxxx>

Acked-by: Alan Cox <alan@xxxxxxxxxx>

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