sdmmc(4): sdmmc_io_function_enable(): don't sleep on lbolt

[Scott Cheloha]

Hi,

I'd like to remove lbolt from the kernel.  I think having it in the
kernel complicates otherwise simple code.

We can start with sdmmc(4).

The goal in sdmmc_io_function_enable() is calling sdmmc_io_function_ready()
up to six times and sleep 1 second between each attempt.  Here's rewritten
code that does with without lbolt.

ok?

Index: sdmmc_io.c
===================================================================
RCS file: /cvs/src/sys/dev/sdmmc/sdmmc_io.c,v
retrieving revision 1.41
diff -u -p -r1.41 sdmmc_io.c
--- sdmmc_io.c  31 Dec 2019 10:05:33 -0000      1.41
+++ sdmmc_io.c  12 Dec 2020 01:04:59 -0000
@@ -231,8 +231,8 @@ sdmmc_io_function_enable(struct sdmmc_fu
 {
        struct sdmmc_softc *sc = sf->sc;
        struct sdmmc_function *sf0 = sc->sc_fn0;
+       int chan, retry = 5;
        u_int8_t rv;
-       int retry = 5;
 
        rw_assert_wrlock(&sc->sc_lock);
 
@@ -244,7 +244,7 @@ sdmmc_io_function_enable(struct sdmmc_fu
        sdmmc_io_write_1(sf0, SD_IO_CCCR_FN_ENABLE, rv);
 
        while (!sdmmc_io_function_ready(sf) && retry-- > 0)
-               tsleep_nsec(&lbolt, PPAUSE, "pause", INFSLP);
+               tsleep_nsec(&chan, PPAUSE, "pause", SEC_TO_NSEC(1));
        return (retry >= 0) ? 0 : ETIMEDOUT;
 }