From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Sasha Levin <sashal@kernel.org>, Shawn Guo <shawnguo@kernel.org>,
linux-arm-kernel@lists.infradead.org,
Lucas Stach <l.stach@pengutronix.de>
Subject: [PATCH AUTOSEL 4.14 04/30] soc: imx: gpc: fix power up sequencing
Date: Wed, 15 Apr 2020 07:46:45 -0400 [thread overview]
Message-ID: <20200415114711.15381-4-sashal@kernel.org> (raw)
In-Reply-To: <20200415114711.15381-1-sashal@kernel.org>
From: Lucas Stach <l.stach@pengutronix.de>
[ Upstream commit e0ea2d11f8a08ba7066ff897e16c5217215d1e68 ]
Currently we wait only until the PGC inverts the isolation setting
before disabling the peripheral clocks. This doesn't ensure that the
reset is properly propagated through the peripheral devices in the
power domain.
Wait until the PGC signals that the power up request is done and
wait a bit for resets to propagate before disabling the clocks.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/soc/imx/gpc.c | 24 +++++++++++++-----------
1 file changed, 13 insertions(+), 11 deletions(-)
diff --git a/drivers/soc/imx/gpc.c b/drivers/soc/imx/gpc.c
index 3a12123de4662..0e083fe8b893f 100644
--- a/drivers/soc/imx/gpc.c
+++ b/drivers/soc/imx/gpc.c
@@ -97,8 +97,8 @@ static int imx6_pm_domain_power_off(struct generic_pm_domain *genpd)
static int imx6_pm_domain_power_on(struct generic_pm_domain *genpd)
{
struct imx_pm_domain *pd = to_imx_pm_domain(genpd);
- int i, ret, sw, sw2iso;
- u32 val;
+ int i, ret;
+ u32 val, req;
if (pd->supply) {
ret = regulator_enable(pd->supply);
@@ -117,17 +117,18 @@ static int imx6_pm_domain_power_on(struct generic_pm_domain *genpd)
regmap_update_bits(pd->regmap, pd->reg_offs + GPC_PGC_CTRL_OFFS,
0x1, 0x1);
- /* Read ISO and ISO2SW power up delays */
- regmap_read(pd->regmap, pd->reg_offs + GPC_PGC_PUPSCR_OFFS, &val);
- sw = val & 0x3f;
- sw2iso = (val >> 8) & 0x3f;
-
/* Request GPC to power up domain */
- val = BIT(pd->cntr_pdn_bit + 1);
- regmap_update_bits(pd->regmap, GPC_CNTR, val, val);
+ req = BIT(pd->cntr_pdn_bit + 1);
+ regmap_update_bits(pd->regmap, GPC_CNTR, req, req);
- /* Wait ISO + ISO2SW IPG clock cycles */
- udelay(DIV_ROUND_UP(sw + sw2iso, pd->ipg_rate_mhz));
+ /* Wait for the PGC to handle the request */
+ ret = regmap_read_poll_timeout(pd->regmap, GPC_CNTR, val, !(val & req),
+ 1, 50);
+ if (ret)
+ pr_err("powerup request on domain %s timed out\n", genpd->name);
+
+ /* Wait for reset to propagate through peripherals */
+ usleep_range(5, 10);
/* Disable reset clocks for all devices in the domain */
for (i = 0; i < pd->num_clks; i++)
@@ -329,6 +330,7 @@ static const struct regmap_config imx_gpc_regmap_config = {
.rd_table = &access_table,
.wr_table = &access_table,
.max_register = 0x2ac,
+ .fast_io = true,
};
static struct generic_pm_domain *imx_gpc_onecell_domains[] = {
--
2.20.1
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next prev parent reply other threads:[~2020-04-15 11:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-15 11:46 [PATCH AUTOSEL 4.14 01/30] clk: at91: usb: continue if clk_hw_round_rate() return zero Sasha Levin
2020-04-15 11:46 ` Sasha Levin [this message]
2020-04-15 11:46 ` [PATCH AUTOSEL 4.14 15/30] net: stmmac: dwmac1000: fix out-of-bounds mac address reg setting Sasha Levin
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