lkml.org 
[lkml]   [2019]   [Jan]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH V10 3/4] mmc: sdhci: Add ADMA3 DMA support for V4 enabled host
On Tue, Jan 22, 2019 at 11:56:32AM -0800, Sowjanya Komatineni wrote:
> Below are the supported DMA types in Host Control1 Register
> with Version 4 enable
> b'00 - SDMA
> b'01 - Not Used
> b'10 - ADMA2
> b'11 - ADMA2 or ADMA3
>
> ADMA3 uses Command Descriptor to issue an SD command.
> A multi-block data transfer is performed by using a pair of CMD
> descriptor and ADMA2 descriptor.
>
> ADMA3 performs multiple of multi-block data transfer by using
> Integrated Descriptor which is more suitable for Command Queuing
> to fetch both Command and Transfer descriptors.
>
> Host Capabilities register indiactes the supports of ADMA3 DMA.
>
> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
> ---
> [V10]: Changes are same as V9 except this series has SDHCI core changes
> into seperate patch
>
> drivers/mmc/host/sdhci.c | 9 ++++++++-
> drivers/mmc/host/sdhci.h | 2 ++
> 2 files changed, 10 insertions(+), 1 deletion(-)

Reviewed-by: Thierry Reding <treding@nvidia.com>
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2019-01-23 10:16    [W:0.065 / U:0.860 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site