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MLK-25468: seco_mu: hook v2x reset event 

after get v2x reset event, return error at read
v2x reset after system enter ks1.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
This commit is contained in:
Frank Li 2021-04-20 11:04:29 -05:00 committed by Denys Drozdov
parent fee1ade052
commit dc760ca6a5
1 changed files with 46 additions and 0 deletions
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46
drivers/firmware/imx/seco_mu.c
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@ -91,6 +91,8 @@
#define MAX_DATA_SIZE_PER_USER (65 * 1024)
#define SC_IRQ_V2X_RESET (1<<7)
/* Header of the messages exchange with the SECO */
struct she_mu_hdr {
u8 ver;
@ -138,6 +140,8 @@ struct seco_mu_device_ctx {
u32 temp_cmd[MAX_MESSAGE_SIZE];
u32 temp_resp[MAX_RECV_SIZE];
u32 temp_resp_size;
struct notifier_block scu_notify;
bool v2x_reset;
};
/* Private struct for seco MU driver. */
@ -275,6 +279,7 @@ static int seco_mu_fops_open(struct inode *nd, struct file *fp)
dev_ctx->status = MU_OPENED;
dev_ctx->pending_hdr = 0;
dev_ctx->v2x_reset = 0;
goto exit;
@ -472,6 +477,11 @@ static ssize_t seco_mu_fops_read(struct file *fp, char __user *buf,
goto exit;
}
if (dev_ctx->v2x_reset) {
err = -EINVAL;
goto exit;
}
/* Wait until the complete message is received on the MU. */
err = wait_event_interruptible(dev_ctx->wq, dev_ctx->pending_hdr != 0);
if (err) {
@ -479,6 +489,12 @@ static ssize_t seco_mu_fops_read(struct file *fp, char __user *buf,
goto exit;
}
if (dev_ctx->v2x_reset) {
err = -EINVAL;
dev_ctx->v2x_reset = 0;
goto exit;
}
devctx_dbg(dev_ctx, "%s %s\n", __func__,
"message received, start transmit to user");
@ -995,6 +1011,20 @@ exit:
return ret;
}
static int imx_sc_v2x_reset_notify(struct notifier_block *nb,
unsigned long event, void *group)
{
struct seco_mu_device_ctx *dev_ctx = container_of(nb,
struct seco_mu_device_ctx, scu_notify);
if (!(event & SC_IRQ_V2X_RESET))
return 0;
dev_ctx->v2x_reset = true;
wake_up_interruptible(&dev_ctx->wq);
return 0;
}
/* Driver probe.*/
static int seco_mu_probe(struct platform_device *pdev)
{
@ -1134,11 +1164,27 @@ static int seco_mu_probe(struct platform_device *pdev)
ret = devm_add_action(dev, if_misc_deregister,
&dev_ctx->miscdev);
dev_ctx->scu_notify.notifier_call = imx_sc_v2x_reset_notify;
ret = imx_scu_irq_register_notifier(&dev_ctx->scu_notify);
if (ret) {
dev_err(&pdev->dev, "v2x reqister scu notifier failed.\n");
return ret;
}
if (ret)
dev_warn(dev,
"failed to add managed removal of miscdev\n");
}
ret = imx_scu_irq_group_enable(IMX_SC_IRQ_GROUP_WAKE,
SC_IRQ_V2X_RESET, true);
if (ret) {
dev_warn(&pdev->dev, "v2x Enable irq failed.\n");
return ret;
}
exit:
return ret;
}