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soc: imx: gpcv2: Assert reset before ungating clock

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[ Upstream commit df88005bd8 ]

In case the power domain clock are ungated before the reset is asserted,
the system might freeze completely. This is likely due to a device is an
undefined state being attached to bus, which sporadically leads to a bus
hang. Assert the reset before the clock are enabled to assure the device
is in defined state before being attached to bus.

Fixes: fe58c887fb ("soc: imx: gpcv2: add support for optional resets")
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Marek Vasut
2022-08-12 19:08:02 +02:00
committed by Greg Kroah-Hartman
parent 83a7e5d2f1
commit a53b30716c
1 changed files with 4 additions and 1 deletions
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5
drivers/soc/imx/gpcv2.c
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@@ -237,6 +237,8 @@ static int imx_pgc_power_up(struct generic_pm_domain *genpd)
}
}
reset_control_assert(domain->reset);
/* Enable reset clocks for all devices in the domain */
ret = clk_bulk_prepare_enable(domain->num_clks, domain->clks);
if (ret) {
@@ -244,7 +246,8 @@ static int imx_pgc_power_up(struct generic_pm_domain *genpd)
goto out_regulator_disable;
}
reset_control_assert(domain->reset);
/* delays for reset to propagate */
udelay(5);
if (domain->bits.pxx) {
/* request the domain to power up */