@@ -142,6 +142,13 @@ enum mhi_state mhi_get_mhi_state(struct mhi_controller *mhi_cntrl)
}
EXPORT_SYMBOL_GPL(mhi_get_mhi_state);
+void mhi_reg_soc_reset(struct mhi_controller *mhi_cntrl)
+{
+ mhi_write_reg(mhi_cntrl, mhi_cntrl->regs, MHI_SOC_RESET_REQ_OFFSET,
+ MHI_SOC_RESET_REQ);
+}
+EXPORT_SYMBOL_GPL(mhi_reg_soc_reset);
+
int mhi_map_single_no_bb(struct mhi_controller *mhi_cntrl,
struct mhi_buf_info *buf_info)
{
@@ -687,6 +687,13 @@ enum mhi_ee_type mhi_get_exec_env(struct mhi_controller *mhi_cntrl);
enum mhi_state mhi_get_mhi_state(struct mhi_controller *mhi_cntrl);
/**
+ * mhi_reg_soc_reset - Trigger a device reset. This can be used as a last resort
+ * to reset and recover a device.
+ * @mhi_cntrl: MHI controller
+ */
+void mhi_reg_soc_reset(struct mhi_controller *mhi_cntrl);
+
+/**
* mhi_device_get - Disable device low power mode
* @mhi_dev: Device associated with the channel
*/
The MHI specification allows to perform a hard reset of the device when writing to the SOC_RESET register. It can be used to completely restart the device (e.g. in case of unrecoverable MHI error). This is up to the MHI controller driver to determine when this hard reset should be used, and in case of MHI errors, should be used as a reset of last resort (after standard MHI stack reset). This function is prefixed with 'mhi_reg' to highlight that this is a stateless function, the MHI layer do nothing except triggering the reset by writing into the right register, this is up to the caller to ensure right mhi_controller state (e.g. unregister the controller if necessary). Signed-off-by: Loic Poulain <loic.poulain@linaro.org> --- drivers/bus/mhi/core/main.c | 7 +++++++ include/linux/mhi.h | 7 +++++++ 2 files changed, 14 insertions(+) -- 2.7.4