bus: ti-sysc: Fix timekeeping_suspended warning on resume

On resume we can get a warning at kernel/time/timekeeping.c:824 for
timekeeping_suspended.

Let's fix this by adding separate functions for sysc_poll_reset_sysstatus()
and sysc_poll_reset_sysconfig() and have the new functions handle also
timekeeping_suspended.

If iopoll at some point supports timekeeping_suspended, we can just drop
the custom handling from these functions.

Fixes: d46f9fbec719 ("bus: ti-sysc: Use optional clocks on for enable and wait for softreset bit")
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index a51c2a8..efd8f0f 100644 (file)
--- 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)