Documentation/timers/timers-howto.txt recommends to use usleep_range for delays 1-20ms. Let's adhere to it. No need for messing with HZ and still do busy looping these days.
Signed-off-by: Wolfram Sang <[email protected]> --- Here is a more detailed test page for this describing my tests: https://elinux.org/Tests:mmc-delay-refactor I did mainly test the insert/eject cycle because powering up the cards seemed to trigger most delays. Transferring data did not cause any calls to mmc_delay() for me. Please let me know if someone knows a test pattern which should be included before applying this change. Works fine for me on Lager (R-Car H2) and Salvator-X (R-Car M3-W). Testing on other platforms very welcome. This should be independent of the IP core. drivers/mmc/core/core.h | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h index 71e6c6d7ceb70d..b2877e2d740fa5 100644 --- a/drivers/mmc/core/core.h +++ b/drivers/mmc/core/core.h @@ -62,12 +62,10 @@ void mmc_set_initial_state(struct mmc_host *host); static inline void mmc_delay(unsigned int ms) { - if (ms < 1000 / HZ) { - cond_resched(); - mdelay(ms); - } else { + if (ms <= 20) + usleep_range(ms * 1000, ms * 1250); + else msleep(ms); - } } void mmc_rescan(struct work_struct *work); -- 2.11.0
