[PATCH v5 10/10] Platform: OLPC: Add restart support to XO-1.75 EC driver
flat view
STALE2789d
SUPERSEDED
From: Lubomir Rintel <lkundrak@v3.sk>
Date: 2019-01-10 17:59:29
Also in:
linux-arm-kernel, linux-pm, lkml, platform-driver-x86
Subsystem:
the rest, x86 platform drivers · Maintainers:
Linus Torvalds, Hans de Goede, Ilpo Järvinen
Revision v5 of 7 in this series.
Revisions (7)
This hooks to arm_pm_restart instead od utilizing a restart handler notifier, because the reboot dance on XO 1.75 needs to sleep (it pokes a GPIO and waits for the EC to initiate the command transaction) and the restart handler is called in atomic context. Sad. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> --- Changes since v4: - Split off from the driver. drivers/platform/olpc/Kconfig | 2 +- drivers/platform/olpc/olpc-xo175-ec.c | 13 +++++++++++++ 2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/olpc/Kconfig b/drivers/platform/olpc/Kconfig
index 858ac1d2290a..02b232c34444 100644
--- a/drivers/platform/olpc/Kconfig
+++ b/drivers/platform/olpc/Kconfig@@ -4,7 +4,7 @@ config OLPC_EC config OLPC_XO175_EC tristate "OLPC XO 1.75 Embedded Controller" - depends on ARCH_MMP || COMPILE_TEST + depends on ARM && (ARCH_MMP || COMPILE_TEST) select SPI_SLAVE select OLPC_EC help
diff --git a/drivers/platform/olpc/olpc-xo175-ec.c b/drivers/platform/olpc/olpc-xo175-ec.c
index c3a176ce474d..74db06bacc44 100644
--- a/drivers/platform/olpc/olpc-xo175-ec.c
+++ b/drivers/platform/olpc/olpc-xo175-ec.c@@ -23,6 +23,7 @@ #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/spi/spi.h> +#include <asm/system_misc.h> struct ec_cmd_t { u8 cmd;
@@ -578,6 +579,14 @@ static int olpc_xo175_ec_set_event_mask(unsigned int mask) return olpc_ec_cmd(CMD_WRITE_EXT_SCI_MASK, args, 2, NULL, 0); } +static void olpc_xo175_ec_restart(enum reboot_mode mode, const char *cmd) +{ + while (1) { + olpc_ec_cmd(CMD_POWER_CYCLE, NULL, 0, NULL, 0); + mdelay(1000); + } +} + static void olpc_xo175_ec_power_off(void) { while (1) {
@@ -649,6 +658,8 @@ static int olpc_xo175_ec_remove(struct spi_device *spi) { if (pm_power_off == olpc_xo175_ec_power_off) pm_power_off = NULL; + if (arm_pm_restart == olpc_xo175_ec_restart) + arm_pm_restart = NULL; spi_slave_abort(spi);
@@ -716,6 +727,8 @@ static int olpc_xo175_ec_probe(struct spi_device *spi) if (pm_power_off == NULL) pm_power_off = olpc_xo175_ec_power_off; + if (arm_pm_restart == NULL) + arm_pm_restart = olpc_xo175_ec_restart; dev_info(&spi->dev, "OLPC XO-1.75 Embedded Controller driver\n");
--
2.20.1