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firmware: raspberrypi: notify VC4 firmware of a reboot 

The firmware-owned GPIO expander on RPi 3 B+ must be in same state
after a reboot as initial power on. Otherwise this would cause a
network boot failure of the BOOTROM. So inform the VC4 firmware to restore
the expander before doing a reboot.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Tested-by: Phil Elwell <phil@raspberrypi.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
hifive-unleashed-5.1
Stefan Wahren 2018-12-07 19:21:11 +01:00
parent c6275e4b12
commit b80ec7c0ef
1 changed files with 11 additions and 0 deletions
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11
drivers/firmware/raspberrypi.c
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@ -238,6 +238,16 @@ static int rpi_firmware_probe(struct platform_device *pdev)
return 0;
}
static void rpi_firmware_shutdown(struct platform_device *pdev)
{
struct rpi_firmware *fw = platform_get_drvdata(pdev);
if (!fw)
return;
rpi_firmware_property(fw, RPI_FIRMWARE_NOTIFY_REBOOT, NULL, 0);
}
static int rpi_firmware_remove(struct platform_device *pdev)
{
struct rpi_firmware *fw = platform_get_drvdata(pdev);
@ -278,6 +288,7 @@ static struct platform_driver rpi_firmware_driver = {
.of_match_table = rpi_firmware_of_match,
},
.probe = rpi_firmware_probe,
.shutdown = rpi_firmware_shutdown,
.remove = rpi_firmware_remove,
};
module_platform_driver(rpi_firmware_driver);