linux-kernel - Re: [PATCH v5 0/5] Add memory mapped read support for ti-qspi

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Date:	Mon, 21 Dec 2015 17:33:02 +0530
From:	Vignesh R <vigneshr@...com>
To:	Tony Lindgren <tony@...mide.com>,
	Brian Norris <computersforpeace@...il.com>,
	Mark Brown <broonie@...nel.org>
CC:	Rob Herring <robh+dt@...nel.org>,
	Russell King <linux@....linux.org.uk>, <hramrach@...il.com>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-mtd@...ts.infradead.org>, <linux-spi@...r.kernel.org>
Subject: Re: [PATCH v5 0/5] Add memory mapped read support for ti-qspi



On 12/11/2015 09:39 AM, Vignesh R wrote:
> Changes since v4:
> Use syscon to access system control module register in ti-qspi driver.
> 
> Changes since v3:
> Rework to introduce spi_flash_read_message struct.
> Support different opcode/addr/data formats as per Brian's suggestion
> here: https://lkml.org/lkml/2015/11/11/454
> 

Gentle Ping on the series...


> Changes since v2:
> Remove mmap_lock_mutex.
> Optimize enable/disable of mmap mode.
> 
> Changes since v1:
> Introduce API in SPI core that MTD flash driver can call for mmap read
> instead of directly calling spi-master driver callback. This API makes
> sure that SPI core msg queue is locked during mmap transfers.
> v1: https://lkml.org/lkml/2015/9/4/103
> 
> 
> Cover letter:
> 
> This patch series adds support for memory mapped read port of ti-qspi.
> ti-qspi has a special memory mapped port through which SPI flash
> memories can be accessed directly via SoC specific memory region.
> 
> First patch adds a method to pass flash specific information like read
> opcode, dummy bytes etc and to request mmap read. Second patch
> implements mmap read method in ti-qspi driver. Patch 3 adapts m25p80 to
> use mmap read method before trying normal SPI transfer. Patch 4 and 5
> add memory map region DT entries for DRA7xx and AM43xx SoCs.
> 
> This patch series is based on the discussions here:
> http://www.spinics.net/lists/linux-spi/msg04796.html
> 
> Tested on DRA74 EVM and AM437x-SK.
> Read performance increases from ~100kB/s to ~2.5MB/s.
> 
> Vignesh R (5):
>   spi: introduce accelerated read support for spi flash devices
>   spi: spi-ti-qspi: add mmap mode read support
>   mtd: devices: m25p80: add support for mmap read request
>   ARM: dts: DRA7: add entry for qspi mmap region
>   ARM: dts: AM4372: add entry for qspi mmap region
> 
>  Documentation/devicetree/bindings/spi/ti_qspi.txt |  22 +++-
>  arch/arm/boot/dts/am4372.dtsi                     |   4 +-
>  arch/arm/boot/dts/dra7.dtsi                       |   6 +-
>  drivers/mtd/devices/m25p80.c                      |  20 ++++
>  drivers/spi/spi-ti-qspi.c                         | 139 +++++++++++++++++-----
>  drivers/spi/spi.c                                 |  45 +++++++
>  include/linux/spi/spi.h                           |  41 +++++++
>  7 files changed, 243 insertions(+), 34 deletions(-)
> 

-- 
Regards
Vignesh
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