diff options
| -rw-r--r-- | drivers/bus/ti-sysc.c | 65 |
1 files changed, 53 insertions, 12 deletions
diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index a51c2a8feed9..efd8f0f7cfe3 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -17,6 +17,7 @@ #include <linux/of_platform.h> #include <linux/slab.h> #include <linux/sys_soc.h> +#include <linux/timekeeping.h> #include <linux/iopoll.h> #include <linux/platform_data/ti-sysc.h> @@ -223,37 +224,77 @@ static u32 sysc_read_sysstatus(struct sysc *ddata) return sysc_read(ddata, offset); } -/* Poll on reset status */ -static int sysc_wait_softreset(struct sysc *ddata) +static int sysc_poll_reset_sysstatus(struct sysc *ddata) { - u32 sysc_mask, syss_done, rstval; - int syss_offset, error = 0; - - if (ddata->cap->regbits->srst_shift < 0) - return 0; - - syss_offset = ddata->offsets[SYSC_SYSSTATUS]; - sysc_mask = BIT(ddata->cap->regbits->srst_shift); + int error, retries; + u32 syss_done, rstval; if (ddata->cfg.quirks & SYSS_QUIRK_RESETDONE_INVERTED) syss_done = 0; else syss_done = ddata->cfg.syss_mask; - if (syss_offset >= 0) { + if (likely(!timekeeping_suspended)) { error = readx_poll_timeout_atomic(sysc_read_sysstatus, ddata, rstval, (rstval & ddata->cfg.syss_mask) == syss_done, 100, MAX_MODULE_SOFTRESET_WAIT); + } else { + retries = MAX_MODULE_SOFTRESET_WAIT; + while (retries--) { + rstval = sysc_read_sysstatus(ddata); + if ((rstval & ddata->cfg.syss_mask) == syss_done) + return 0; + udelay(2); /* Account for udelay flakeyness */ + } + error = -ETIMEDOUT; + } - } else if (ddata->cfg.quirks & SYSC_QUIRK_RESET_STATUS) { + return error; +} + +static int sysc_poll_reset_sysconfig(struct sysc *ddata) +{ + int error, retries; + u32 sysc_mask, rstval; + + sysc_mask = BIT(ddata->cap->regbits->srst_shift); + + if (likely(!timekeeping_suspended)) { error = readx_poll_timeout_atomic(sysc_read_sysconfig, ddata, rstval, !(rstval & sysc_mask), 100, MAX_MODULE_SOFTRESET_WAIT); + } else { + retries = MAX_MODULE_SOFTRESET_WAIT; + while (retries--) { + rstval = sysc_read_sysconfig(ddata); + if (!(rstval & sysc_mask)) + return 0; + udelay(2); /* Account for udelay flakeyness */ + } + error = -ETIMEDOUT; } return error; } +/* Poll on reset status */ +static int sysc_wait_softreset(struct sysc *ddata) +{ + int syss_offset, error = 0; + + if (ddata->cap->regbits->srst_shift < 0) + return 0; + + syss_offset = ddata->offsets[SYSC_SYSSTATUS]; + + if (syss_offset >= 0) + error = sysc_poll_reset_sysstatus(ddata); + else if (ddata->cfg.quirks & SYSC_QUIRK_RESET_STATUS) + error = sysc_poll_reset_sysconfig(ddata); + + return error; +} + static int sysc_add_named_clock_from_child(struct sysc *ddata, const char *name, const char *optfck_name) |