]> git.baikalelectronics.ru Git - kernel.git/commit
i2c: nvidia-gpu: Handle timeout correctly in gpu_i2c_check_status()
authorKai-Heng Feng <kai.heng.feng@canonical.com>
Tue, 24 Mar 2020 15:28:11 +0000 (23:28 +0800)
committerWolfram Sang <wsa@the-dreams.de>
Tue, 24 Mar 2020 21:40:55 +0000 (22:40 +0100)
commit519278ebbea2566d27872c14614102ff74d7fab3
tree0af8ad5ef21263aad1df5db0c60c19a8bd70f5c2
parent1062cedecbfe8c36a80635b42895a3f030984793
i2c: nvidia-gpu: Handle timeout correctly in gpu_i2c_check_status()

Nvidia card may come with a "phantom" UCSI device, and its driver gets
stuck in probe routine, prevents any system PM operations like suspend.

There's an unaccounted case that the target time can equal to jiffies in
gpu_i2c_check_status(), let's solve that by using readl_poll_timeout()
instead of jiffies comparison functions.

Fixes: d140226f71c2 ("i2c: add i2c bus driver for NVIDIA GPU")
Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Ajay Gupta <ajayg@nvidia.com>
Tested-by: Ajay Gupta <ajayg@nvidia.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
drivers/i2c/busses/i2c-nvidia-gpu.c