Thread (9 messages) 9 messages, 4 authors, 2019-09-30
STALE2463d

[PATCH v2 2/2] soc: amlogic: ee-pwrc: ensure driver state maches HW state

From: Kevin Hilman <khilman@kernel.org>
Date: 2019-09-25 21:35:58
Also in: linux-amlogic, linux-pm
Subsystem: arm/amlogic meson soc support, the rest · Maintainers: Neil Armstrong, Kevin Hilman, Linus Torvalds

From: Kevin Hilman <khilman@baylibre.com>

During init, ensure that the driver on/off state as well as clock and
reset state matches the hardware state.  Do this by always calling the
drivers 'on' function, and then callling the 'off' function if the
HW state was initially detected as off.

Signed-off-by: Kevin Hilman <khilman@baylibre.com>
---
 drivers/soc/amlogic/meson-ee-pwrc.c | 29 ++++++++---------------------
 1 file changed, 8 insertions(+), 21 deletions(-)
diff --git a/drivers/soc/amlogic/meson-ee-pwrc.c b/drivers/soc/amlogic/meson-ee-pwrc.c
index dcce8e694a07..2e8eee0dc166 100644
--- a/drivers/soc/amlogic/meson-ee-pwrc.c
+++ b/drivers/soc/amlogic/meson-ee-pwrc.c
@@ -323,6 +323,8 @@ static int meson_ee_pwrc_init_domain(struct platform_device *pdev,
 				     struct meson_ee_pwrc *pwrc,
 				     struct meson_ee_pwrc_domain *dom)
 {
+	bool is_off;
+
 	dom->pwrc = pwrc;
 	dom->num_rstc = dom->desc.reset_names_count;
 	dom->num_clks = dom->desc.clk_names_count;
@@ -356,27 +358,12 @@ static int meson_ee_pwrc_init_domain(struct platform_device *pdev,
 	dom->base.power_on = meson_ee_pwrc_on;
 	dom->base.power_off = meson_ee_pwrc_off;
 
-	/*
-         * TOFIX: This is a special case for the VPU power domain, which can
-	 * be enabled previously by the bootloader. In this case the VPU
-         * pipeline may be functional but no driver maybe never attach
-         * to this power domain, and if the domain is disabled it could
-         * cause system errors. This is why the pm_domain_always_on_gov
-         * is used here.
-         * For the same reason, the clocks should be enabled in case
-         * we need to power the domain off, otherwise the internal clocks
-         * prepare/enable counters won't be in sync.
-         */
-	if (dom->num_clks && dom->desc.is_off && !dom->desc.is_off(dom)) {
-		int ret = clk_bulk_prepare_enable(dom->num_clks, dom->clks);
-		if (ret)
-			return ret;
-
-		pm_genpd_init(&dom->base, &pm_domain_always_on_gov, false);
-	} else
-		pm_genpd_init(&dom->base, NULL,
-			      (dom->desc.is_off ?
-			       dom->desc.is_off(dom) : true));
+	/* Ensure that driver state matches HW state */
+	is_off = dom->desc.is_off ? dom->desc.is_off(dom) : true;
+	meson_ee_pwrc_on(&dom->base);
+	if (is_off)
+		meson_ee_pwrc_off(&dom->base);
+	pm_genpd_init(&dom->base, NULL, is_off);
 
 	return 0;
 }
-- 
2.22.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help