linux-kernel - Re: [PATCH 2/3] msm: Peripheral Image Loader (PIL) driver

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Date:	Wed, 16 Mar 2011 03:20:19 -0700
From:	Daniel Walker <dwalker@...o99.com>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	David Brown <davidb@...eaurora.org>, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Saravana Kannan <skannan@...eaurora.org>
Subject: Re: [PATCH 2/3] msm: Peripheral Image Loader (PIL) driver

On Wed, 2011-03-09 at 20:44 -0800, Stephen Boyd wrote:
> On 8660, the modem, dsp, and sensors peripherals require their
> firmware to be loaded into memory before they can be properly
> taken out of reset.
> 
> Drivers are expected to call pil_get() when they wish to load a
> peripheral. This will initiate multiple firmware_request()s for
> the metadata and image blobs for a peripheral. Once the image has
> been loaded into memory, it is validated and brought out of reset
> via the peripheral reset driver.

Why can't this be part of the generic firmware request API ?

> Change-Id: I041139464bbd3b646b82370ab540f40b0ac9af6b

Can't have Change-Id's ..

> Reviewed-by: Saravana Kannan <skannan@...eaurora.org>
> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
> ---
>  arch/arm/mach-msm/Kconfig                          |   13 +
>  arch/arm/mach-msm/Makefile                         |    2 +
>  arch/arm/mach-msm/include/mach/peripheral-loader.h |   23 +
>  arch/arm/mach-msm/peripheral-loader.c              |  402
> +++++++++++++++
>  arch/arm/mach-msm/peripheral-loader.h              |   38 ++
>  arch/arm/mach-msm/peripheral-reset.c               |  528
> ++++++++++++++++++++
>  6 files changed, 1006 insertions(+), 0 deletions(-)
>  create mode 100644 arch/arm/mach-msm/include/mach/peripheral-loader.h
>  create mode 100644 arch/arm/mach-msm/peripheral-loader.c
>  create mode 100644 arch/arm/mach-msm/peripheral-loader.h
>  create mode 100644 arch/arm/mach-msm/peripheral-reset.c
> 
> diff --git a/arch/arm/mach-msm/Kconfig b/arch/arm/mach-msm/Kconfig
> index 997c5bd..25b73b0 100644
> --- a/arch/arm/mach-msm/Kconfig
> +++ b/arch/arm/mach-msm/Kconfig
> @@ -210,4 +210,17 @@ config IOMMU_API
>  
>  config MSM_SCM
>         bool
> +
> +config MSM_PIL
> +       bool "Peripheral image loading (PIL)"
> +       select FW_LOADER
> +       select MSM_SCM
> +       depends on ARCH_MSM8X60
> +       help
> +         Some peripherals need to be loaded into memory before they
> can be
> +         brought out of reset.
> +
> +         Say yes to support these devices.
> +
> +

You shouldn't be adding anything like this to the Kconfig. To me if you
add stuff like this it's a big red flag.

I didn't review the rest sign it might be wasted effort on my part..

Daniel


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