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