Libertas driver performance on Samsung platform

Jacky Lam jackylam.gsl at
Mon Nov 16 01:43:38 EST 2009

Dear Dan,

	I just talk to tommy and find that the problem really happened in the
interrupt support as you said. Thanks for all advice from you.


Dan Williams 提到:
> On Mon, 2009-11-16 at 09:43 +0800, Jacky Lam wrote:
>> Dan Williams 提到:
>>> On Fri, 2009-11-13 at 13:12 +0800, Jacky Lam wrote:
>>>> Dear all,
>>>> 	I have read the previous mail about the low performance of Samsung
>>>> BSP's SDIO platform driver when working with Libertas. I want to know if
>>>> anyone have tried the kernel mainstream's Samsung driver and have any
>>>> improvement on that?
>>> Does the Samsung SDHC have quirks or limitations with respect to DMA,
>>> block size, transfer width, etc?
>>> Dan
>> Dear Dan,
>> 	I look through the source code and can't find any "special" limitation
>> for the DMA, block size, transfer width.....Maybe I am not familiar
>> enough with Linux MMC stack. Could you tell me if there is any
>> requirement for the MMC stack on the host's DMA, block size, transfer
>> width..etc? So, I can pinpoint my investigation?
> There's no requirement in the stack, but the libertas driver and
> firmware expect multi-block transfer ability and interrupt support.  The
> libertas firmware will fail to load if if the host controller doesn't
> support multi-block, which we just found to be a limitation of one of
> the i.MX platform for example.
> Dan

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