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55 lines
1.6 KiB
Diff
55 lines
1.6 KiB
Diff
From a32b0e7851320cba0144d20e87e5326ee81e1063 Mon Sep 17 00:00:00 2001
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From: Gabor Juhos <juhosg@openwrt.org>
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Date: Tue, 5 Feb 2013 20:57:55 +0100
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Subject: [PATCH] spi/ath79: add shutdown handler
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commit 7410e848583f9120dd5f9414629f01bb76b5ee5f upstream.
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The SPI controller of the AR7xxx/AR9xxx SoCs
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have a special mode which allows the SoC to
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directly read data from SPI flash chips. In
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this mode, the content of the SPI flash chip
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can be accessed via a memory mapped region.
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During early init time, the kernel expects
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that the flash chip is accessible through
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that memory region because it reads board
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specific values (e.g. MAC address, WiFi
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calibration data) from the flash on various
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boards.
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This is working if the kernel is loaded
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directly by the bootloader because that
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leaves the SPI controller in the special
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mode. However it is not working in a kexec'd
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kernel because the SPI driver does not restore
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the special mode during shutdown.
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The patch adds a shutdown handler to fix this
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issue.
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Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
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Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
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---
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drivers/spi/spi-ath79.c | 6 ++++++
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1 file changed, 6 insertions(+)
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--- a/drivers/spi/spi-ath79.c
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+++ b/drivers/spi/spi-ath79.c
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@@ -308,9 +308,15 @@ static int ath79_spi_remove(struct platf
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return 0;
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}
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+static void ath79_spi_shutdown(struct platform_device *pdev)
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+{
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+ ath79_spi_remove(pdev);
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+}
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+
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static struct platform_driver ath79_spi_driver = {
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.probe = ath79_spi_probe,
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.remove = ath79_spi_remove,
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+ .shutdown = ath79_spi_shutdown,
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.driver = {
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.name = DRV_NAME,
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.owner = THIS_MODULE,
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