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

[John Crispin]

Hi,

one more request

On 16/11/2015 18:03, 未命名 wrote:
> Instead of use the set_4byte function in spi-nor.c, I use this patch
> for simplest modification. In fact, set_4byte also send 0xe9 command to
> the spi flash.
> 
> Signed-off-by: Shonn Lu <countrysideboy at qq.com>
> ---
>  .../0064-reset-m25p80-when-shutdown.patch          | 27
> ++++++++++++++++++++++
>  1 file changed, 27 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..aca758d
> --- /dev/null
> +++ b/target/linux/ramips/patches-3.18/0064-reset-m25p80-when-shutdown.patch
> @@ -0,0 +1,27 @@
> +--- a/drivers/mtd/devices/m25p80.c
> ++++ b/drivers/mtd/devices/m25p80.c
> +@@ -322,6 +322,16 @@
> + {
> + struct m25p *flash = spi_get_drvdata(spi);
> +
> ++ if ((&flash->spi_nor)->addr_width > 3) {
> ++ printk(KERN_INFO "m25p80: exit 4-byte address mode\n");
> ++ flash->command[0] = SPINOR_OP_EX4B;  // exit 4-byte address mode: 0xe9
> ++ spi_write(flash->spi, flash->command, 1);
> ++ flash->command[0] = 0x66;  // enable reset
> ++ spi_write(flash->spi, flash->command, 1); 
> ++ flash->command[0] = 0x99;  // reset
> ++ spi_write(flash->spi, flash->command, 1);

this needs to be indented with tabs

	John

> ++ }
> ++
> + /* Clean up MTD stuff. */
> + return mtd_device_unregister(&flash->mtd);
> + }
> +@@ -385,6 +395,7 @@
> + .id_table = m25p_ids,
> + .probe = m25p_probe,
> + .remove = m25p_remove,
> ++ .shutdown = m25p_remove, // add shutdown method to reset spi flash
> +
> + /* 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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> 
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