bus: sunxi-rsb: Fix shutdown

Function sunxi_rsb_hw_exit() is sometimes called with pm runtime
disabled, so in such cases pm_runtime_resume() will fail with -EACCES.

Instead of doing whole dance of enabling pm runtime and thus clock just
to disable it again immediately, just check if disabling clock is
needed. That way calling pm_runtime_resume() is not needed at all.

Fixes: 4a0dbc12e618 ("bus: sunxi-rsb: Implement runtime power management")
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20211121083537.612473-1-jernej.skrabec@gmail.com

diff --git a/drivers/bus/sunxi-rsb.c b/drivers/bus/sunxi-rsb.c
index 6f225dd..4566e73 100644 (file)
--- a/drivers/bus/sunxi-rsb.c
+++ b/drivers/bus/sunxi-rsb.c
@@ -687,11 +687,11 @@ err_clk_disable:
 
 static void sunxi_rsb_hw_exit(struct sunxi_rsb *rsb)
 {
-       /* Keep the clock and PM reference counts consistent. */
-       if (pm_runtime_status_suspended(rsb->dev))
-               pm_runtime_resume(rsb->dev);
        reset_control_assert(rsb->rstc);
-       clk_disable_unprepare(rsb->clk);
+
+       /* Keep the clock and PM reference counts consistent. */
+       if (!pm_runtime_status_suspended(rsb->dev))
+               clk_disable_unprepare(rsb->clk);
 }
 
 static int __maybe_unused sunxi_rsb_runtime_suspend(struct device *dev)