diff options
| author | Bhaumik Bhatt <bbhatt@codeaurora.org> | 2021-03-31 21:34:24 +0300 |
|---|---|---|
| committer | Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> | 2021-03-31 21:39:52 +0300 |
| commit | 1a42aef2588052c4e3f7df241b947425641f05c9 (patch) | |
| tree | 93a894dc0e8415caed1d4a92aeb449d18175aec0 /drivers/bus | |
| parent | 19e60d6e88a63df70091574b3dfe85945d2fd70f (diff) | |
| download | linux-1a42aef2588052c4e3f7df241b947425641f05c9.tar.xz | |
bus: mhi: core: Introduce internal register poll helper function
Introduce helper function to allow MHI core driver to poll for
a value in a register field. This helps reach a common path to
read and poll register values along with a retry time interval.
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Loic Poulain <loic.poulain@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/1617215665-19593-2-git-send-email-bbhatt@codeaurora.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
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) { |