117 lines
3.3 KiB
Diff
117 lines
3.3 KiB
Diff
|
From 302cd9b8a9f1f8a7735fabea3b9a7645dc40f9cc Mon Sep 17 00:00:00 2001
|
||
|
|
From: Myy Miouyouyou <myy@miouyouyou.fr>
|
||
|
|
Date: Sun, 7 Jan 2018 01:52:44 +0100
|
||
|
|
Subject: [PATCH] drivers: mmc: dw-mci-rockchip: Handle ASUS Tinkerboard reboot
|
||
|
|
|
||
|
|
On ASUS Tinkerboard systems, if the SDMMC hardware is shutdown before
|
||
|
|
rebooting, the system will be dead, as the SDMMC is the only way to
|
||
|
|
boot anything, and the hardware doesn't power up the SDMMC hardware
|
||
|
|
automatically when rebooting.
|
||
|
|
|
||
|
|
So, when using an ASUS Tinkerboard system, a new reboot handler is
|
||
|
|
installed. This reboot handler takes care of powering the SDMMC
|
||
|
|
hardware again before restarting the system, resolving the issue.
|
||
|
|
|
||
|
|
The code was inspired by the pwrseq_emmc.c, which seems to overcome
|
||
|
|
similar effects with eMMC hardware.
|
||
|
|
|
||
|
|
Signed-off-by: Myy Miouyouyou <myy@miouyouyou.fr>
|
||
|
|
---
|
||
|
|
drivers/mmc/host/dw_mmc-rockchip.c | 66 ++++++++++++++++++++++++++++++++++++++
|
||
|
|
1 file changed, 66 insertions(+)
|
||
|
|
|
||
|
|
diff --git a/drivers/mmc/host/dw_mmc-rockchip.c b/drivers/mmc/host/dw_mmc-rockchip.c
|
||
|
|
index a3f1c2b30..7eac1f221 100644
|
||
|
|
--- a/drivers/mmc/host/dw_mmc-rockchip.c
|
||
|
|
+++ b/drivers/mmc/host/dw_mmc-rockchip.c
|
||
|
|
@@ -16,6 +16,11 @@
|
||
|
|
#include <linux/pm_runtime.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
|
||
|
|
+#include <linux/regulator/consumer.h>
|
||
|
|
+#include <linux/reboot.h>
|
||
|
|
+#include <linux/delay.h>
|
||
|
|
+#include "../core/core.h"
|
||
|
|
+
|
||
|
|
#include "dw_mmc.h"
|
||
|
|
#include "dw_mmc-pltfm.h"
|
||
|
|
|
||
|
|
@@ -334,6 +339,66 @@ static const struct of_device_id dw_mci_rockchip_match[] = {
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, dw_mci_rockchip_match);
|
||
|
|
|
||
|
|
+struct dw_mci_rockchip_broken_boards_data {
|
||
|
|
+ struct notifier_block reset_nb;
|
||
|
|
+ struct platform_device *pdev;
|
||
|
|
+};
|
||
|
|
+
|
||
|
|
+/* This reboot handler handles cases where disabling the SDMMC on
|
||
|
|
+ * reboot will cause the hardware to be unable to start correctly
|
||
|
|
+ * after rebooting.
|
||
|
|
+ *
|
||
|
|
+ * This happens with Tinkerboard systems...
|
||
|
|
+ */
|
||
|
|
+static int dw_mci_rockchip_broken_boards_reset_nb(
|
||
|
|
+ struct notifier_block *this,
|
||
|
|
+ unsigned long mode, void *cmd)
|
||
|
|
+{
|
||
|
|
+ struct dw_mci_rockchip_broken_boards_data const *data =
|
||
|
|
+ container_of(this,
|
||
|
|
+ struct dw_mci_rockchip_broken_boards_data,
|
||
|
|
+ reset_nb);
|
||
|
|
+ struct dw_mci *host = platform_get_drvdata(data->pdev);
|
||
|
|
+ struct mmc_host *mmc = host->slot->mmc;
|
||
|
|
+
|
||
|
|
+ printk(KERN_ERR "Meow.\n");
|
||
|
|
+
|
||
|
|
+ mmc_power_off(mmc);
|
||
|
|
+
|
||
|
|
+ mdelay(20);
|
||
|
|
+
|
||
|
|
+ if (!IS_ERR(mmc->supply.vmmc))
|
||
|
|
+ regulator_enable(mmc->supply.vmmc);
|
||
|
|
+
|
||
|
|
+ if (!IS_ERR(mmc->supply.vqmmc))
|
||
|
|
+ regulator_set_voltage(mmc->supply.vqmmc, 3000000, 3300000);
|
||
|
|
+
|
||
|
|
+ printk(KERN_ERR "woeM.\n");
|
||
|
|
+
|
||
|
|
+ return NOTIFY_DONE;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+static void dw_mci_rockchip_register_broken_boards_reboot_handler(
|
||
|
|
+ struct platform_device *pdev)
|
||
|
|
+{
|
||
|
|
+ struct dw_mci_rockchip_broken_boards_data *data;
|
||
|
|
+
|
||
|
|
+ if (!of_machine_is_compatible("asus,rk3288-tinker"))
|
||
|
|
+ return;
|
||
|
|
+
|
||
|
|
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
|
||
|
|
+
|
||
|
|
+ if (!data)
|
||
|
|
+ return;
|
||
|
|
+
|
||
|
|
+ data->reset_nb.notifier_call =
|
||
|
|
+ dw_mci_rockchip_broken_boards_reset_nb;
|
||
|
|
+ data->reset_nb.priority = 255;
|
||
|
|
+ register_restart_handler(&data->reset_nb);
|
||
|
|
+
|
||
|
|
+ data->pdev = pdev;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
static int dw_mci_rockchip_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
const struct dw_mci_drv_data *drv_data;
|
||
|
|
@@ -361,6 +426,7 @@ static int dw_mci_rockchip_probe(struct platform_device *pdev)
|
||
|
|
}
|
||
|
|
|
||
|
|
pm_runtime_put_autosuspend(&pdev->dev);
|
||
|
|
+ dw_mci_rockchip_register_broken_boards_reboot_handler(pdev);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
--
|
||
|
|
2.14.1
|
||
|
|
|