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Wysocki" , Rob Herring Subject: [RFC][PATCH] pinctrl: Rework driver_deferred_probe_check_state() evaluation since default timeout has changed Date: Sat, 8 Aug 2020 04:35:12 +0000 Message-Id: <20200808043512.106865-1-john.stultz@linaro.org> X-Mailer: git-send-email 2.17.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In commit bec6c0ecb243 ("pinctrl: Remove use of driver_deferred_probe_check_state_continue()"), we removed the use of driver_deferred_probe_check_state_continue() which effectively never returned -ETIMED_OUT, with the driver_deferred_probe_check_state() function that had been reworked to properly return ETIMED_OUT when the deferred probe timeout expired. Along with that change, we set the default timeout to 30 seconds. However, since moving the timeout to 30 seconds caused some issues for some users with optional dt links, we set the default timeout back to zero - see commit ce68929f07de ("driver core: Revert default driver_deferred_probe_timeout value to 0") This in essence changed the behavior of the pinctrl's usage of driver_deferred_probe_check_state(), as it now would return ETIMED_OUT by default. Thierry reported this caused problems with resume on tegra platforms. Thus this patch tweaks the pinctrl logic so that it behaves as before. If modules are enabled, we'll only return EPROBE_DEFERRED while we're missing drivers linked in the DT. Cc: linux-pm@vger.kernel.org Cc: Greg Kroah-Hartman Cc: Linus Walleij Cc: Thierry Reding Cc: Mark Brown Cc: Liam Girdwood Cc: Bjorn Andersson Cc: Saravana Kannan Cc: Todd Kjos Cc: Len Brown Cc: Pavel Machek Cc: Ulf Hansson Cc: Kevin Hilman Cc: "Rafael J. Wysocki" Cc: Rob Herring Fixes: bec6c0ecb243 ("pinctrl: Remove use of driver_deferred_probe_check_state_continue()") Fixes: ce68929f07de ("driver core: Revert default driver_deferred_probe_timeout value to 0") Reported-by: Thierry Reding Signed-off-by: John Stultz --- drivers/pinctrl/devicetree.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/pinctrl/devicetree.c b/drivers/pinctrl/devicetree.c index c6fe7d64c913..09ddf567ccb4 100644 --- a/drivers/pinctrl/devicetree.c +++ b/drivers/pinctrl/devicetree.c @@ -129,9 +129,8 @@ static int dt_to_map_one_config(struct pinctrl *p, if (!np_pctldev || of_node_is_root(np_pctldev)) { of_node_put(np_pctldev); ret = driver_deferred_probe_check_state(p->dev); - /* keep deferring if modules are enabled unless we've timed out */ - if (IS_ENABLED(CONFIG_MODULES) && !allow_default && - (ret == -ENODEV)) + /* keep deferring if modules are enabled */ + if (IS_ENABLED(CONFIG_MODULES) && !allow_default) ret = -EPROBE_DEFER; return ret; } -- 2.17.1