linux-kernel - Re: [PATCH v2 0/3] Introduce the request

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Date:   Tue, 17 Mar 2020 15:25:05 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Baolin Wang <baolin.wang7@...il.com>, ulf.hansson@...aro.org
Cc:     orsonzhai@...il.com, zhang.lyra@...il.com, arnd@...db.de,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/3] Introduce the request_atomic() for the host

On 17/03/20 12:14 pm, Baolin Wang wrote:
> This patch set introduces a new request_atomic() interface for the
> MMC host controller, which is used to submit a request to host in
> the atomic context, such as in the irq hard handler, to reduce the
> request latency.
> 
> Any comments are welcome. Thanks.
> 
> Note: Adrian pointed out that it is not good if moving the polling of
> inhibit bits in sdhci_send_command() into the interrupt context, but
> now I have not found a better way to address Adrian's concern. Moveover
> this is an unusual abnormal case and the original code has the same
> problem, so I plan to create another patch set to talk about and fix
> this issue.

I tend to think the API requires the possibility for host controllers to
return "busy", so that should be sorted out first.

> 
> Changes from v1:
>  - Re-split the changes to make them more clear suggested by Ulf.
>  - Factor out the auto CMD23 checking into a separate function.
> 
> Baolin Wang (3):
>   mmc: host: Introduce the request_atomic() for the host
>   mmc: host: sdhci: Implement the request_atomic() API
>   mmc: host: sdhci-sprd: Implement the request_atomic() API
> 
>  drivers/mmc/host/mmc_hsq.c    |  5 ++++-
>  drivers/mmc/host/sdhci-sprd.c | 23 ++++++++++++++++++++---
>  drivers/mmc/host/sdhci.c      | 27 +++++++++++++++++++--------
>  drivers/mmc/host/sdhci.h      |  1 +
>  include/linux/mmc/host.h      |  3 +++
>  5 files changed, 47 insertions(+), 12 deletions(-)
>