diff options
Diffstat (limited to 'drivers/bus')
| -rw-r--r-- | drivers/bus/mhi/core/internal.h | 3 | ||||
| -rw-r--r-- | drivers/bus/mhi/core/main.c | 23 |
2 files changed, 26 insertions, 0 deletions
diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h index 7aa5cfd874e4..e690f154212f 100644 --- a/drivers/bus/mhi/core/internal.h +++ b/drivers/bus/mhi/core/internal.h @@ -646,6 +646,9 @@ int __must_check mhi_read_reg(struct mhi_controller *mhi_cntrl, int __must_check mhi_read_reg_field(struct mhi_controller *mhi_cntrl, void __iomem *base, u32 offset, u32 mask, u32 shift, u32 *out); +int __must_check mhi_poll_reg_field(struct mhi_controller *mhi_cntrl, + void __iomem *base, u32 offset, u32 mask, + u32 shift, u32 val, u32 delayus); void mhi_write_reg(struct mhi_controller *mhi_cntrl, void __iomem *base, u32 offset, u32 val); void mhi_write_reg_field(struct mhi_controller *mhi_cntrl, void __iomem *base, diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index 8b68657c76c3..58b8111ce66c 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -4,6 +4,7 @@ * */ +#include <linux/delay.h> #include <linux/device.h> #include <linux/dma-direction.h> #include <linux/dma-mapping.h> @@ -37,6 +38,28 @@ int __must_check mhi_read_reg_field(struct mhi_controller *mhi_cntrl, return 0; } +int __must_check mhi_poll_reg_field(struct mhi_controller *mhi_cntrl, + void __iomem *base, u32 offset, + u32 mask, u32 shift, u32 val, u32 delayus) +{ + int ret; + u32 out, retry = (mhi_cntrl->timeout_ms * 1000) / delayus; + + while (retry--) { + ret = mhi_read_reg_field(mhi_cntrl, base, offset, mask, shift, + &out); + if (ret) + return ret; + + if (out == val) + return 0; + + fsleep(delayus); + } + + return -ETIMEDOUT; +} + void mhi_write_reg(struct mhi_controller *mhi_cntrl, void __iomem *base, u32 offset, u32 val) { |