[OpenWrt-Devel] [PATCH] ramips: reset m25p80 when shutdown

[Weijie Gao]

2015-11-08 4:42 GMT+08:00 Shonn Lu <countrysideboy at qq.com>:

> Signed-off-by: Shonn Lu <countrysideboy at qq.com>
> ---
>  .../0064-reset-m25p80-when-shutdown.patch          | 24
> ++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>  create mode 100644
> target/linux/ramips/patches-3.18/0064-reset-m25p80-when-shutdown.patch
>
> diff --git
> a/target/linux/ramips/patches-3.18/0064-reset-m25p80-when-shutdown.patch
> b/target/linux/ramips/patches-3.18/0064-reset-m25p80-when-shutdown.patch
> new file mode 100644
> index 0000000..76f916a
> --- /dev/null
> +++
> b/target/linux/ramips/patches-3.18/0064-reset-m25p80-when-shutdown.patch
> @@ -0,0 +1,24 @@
> +--- a/drivers/mtd/devices/m25p80.c
> ++++ b/drivers/mtd/devices/m25p80.c
> +@@ -319,6 +319,12 @@
> + {
> +       struct m25p     *flash = spi_get_drvdata(spi);
> +
> ++    //        play4fun: add spi flash reset code
> ++      flash->command[0] = 0x66;
> ++      spi_write(flash->spi, flash->command, 1);
> ++      flash->command[0] = 0x99;
> ++      spi_write(flash->spi, flash->command, 1);
> ++
> +       /* Clean up MTD stuff. */
> +       return mtd_device_unregister(&flash->mtd);
> + }
> +@@ -382,6 +388,8 @@
> +       .id_table       = m25p_ids,
> +       .probe  = m25p_probe,
> +       .remove = m25p_remove,
> ++      //      play4fun add shutdown method to reset spi flash
> ++      .shutdown = m25p_remove,
> +
> +       /* REVISIT: many of these chips have deep power-down modes, which
> +        * should clearly be entered on suspend() to minimize power use.
> --
> 1.9.1
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This is not enough for w25q256.
The Extended Address Register (EAR) must be cleared, or the higher half
16MB may be accessed in 3-byte addressing mode, and this will cause a boot
failure.
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