On 03/16/2011 03:20 AM, Daniel Walker wrote:

On Wed, 2011-03-09 at 20:44 -0800, Stephen Boyd wrote:

quoted

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 ?

The generic firmware request API gets a blob from userspace.  The PIL
driver uses this interface to get blobs.  The additions here are:

- ref counting, per-name
- peripheral reset sequence, per-name
- configurable loading mechanism, secure vs. non-secure
- common format for retrieving metadata to verify image integrity

Since several peripherals need this exact sequence, it made sense to
create a small driver for this functionality.

quoted

Change-Id: I041139464bbd3b646b82370ab540f40b0ac9af6b

Can't have Change-Id's ..

Dave noted this for the first patch in the series.  For subsequent
postings, Steve will remove the Change-Ids.  Otherwise, Dave said he
would remove them prior to adding them to the MSM tree.

quoted

Reviewed-by: Saravana Kannan <redacted>
Signed-off-by: Stephen Boyd <redacted>
---
 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

Would you elaborate on your objection here?  Should the Kconfig be
dropped and the Makefile use 'obj-$(ARCH_MSM8X60)'?  That doesn't make
sense to me since we already have a 2nd architecture, 8960, that uses
PIL.  How do you think this should be handled?  Thanks.

- Bryan

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