diff options
| author | Lucas Stach <l.stach@pengutronix.de> | 2021-05-10 07:00:41 +0300 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2021-05-23 05:58:12 +0300 |
| commit | fe58c887fb8ca25adab62fae20632d8423a00a91 (patch) | |
| tree | 0743413c864a56cf357e87476ec363c71078edca /drivers/soc/imx | |
| parent | c0ce75395f8d088ba56dcec3218c628ef2bb6d73 (diff) | |
| download | linux-fe58c887fb8ca25adab62fae20632d8423a00a91.tar.xz | |
soc: imx: gpcv2: add support for optional resets
Normally the reset for the devices inside the power domain is
triggered automatically from the PGC in the power-up sequencing,
however on i.MX8MM this doesn't work for the GPU power domains.
Add support for triggering the reset explicitly during the power
up sequencing.
Tested-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'drivers/soc/imx')
| -rw-r--r-- | drivers/soc/imx/gpcv2.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c index fdf759a7c865..04ce64326c19 100644 --- a/drivers/soc/imx/gpcv2.c +++ b/drivers/soc/imx/gpcv2.c @@ -15,6 +15,7 @@ #include <linux/pm_runtime.h> #include <linux/regmap.h> #include <linux/regulator/consumer.h> +#include <linux/reset.h> #include <linux/sizes.h> #include <dt-bindings/power/imx7-power.h> #include <dt-bindings/power/imx8mq-power.h> @@ -108,6 +109,7 @@ struct imx_pgc_domain { struct generic_pm_domain genpd; struct regmap *regmap; struct regulator *regulator; + struct reset_control *reset; struct clk_bulk_data *clks; int num_clks; @@ -163,6 +165,8 @@ static int imx_pgc_power_up(struct generic_pm_domain *genpd) goto out_regulator_disable; } + reset_control_assert(domain->reset); + if (domain->bits.pxx) { /* request the domain to power up */ regmap_update_bits(domain->regmap, GPC_PU_PGC_SW_PUP_REQ, @@ -185,6 +189,11 @@ static int imx_pgc_power_up(struct generic_pm_domain *genpd) GPC_PGC_CTRL_PCR); } + /* delay for reset to propagate */ + udelay(5); + + reset_control_deassert(domain->reset); + /* request the ADB400 to power up */ if (domain->bits.hskreq) { regmap_update_bits(domain->regmap, GPC_PU_PWRHSK, @@ -540,6 +549,11 @@ static int imx_pgc_domain_probe(struct platform_device *pdev) return dev_err_probe(domain->dev, domain->num_clks, "Failed to get domain's clocks\n"); + domain->reset = devm_reset_control_array_get_optional_exclusive(domain->dev); + if (IS_ERR(domain->reset)) + return dev_err_probe(domain->dev, PTR_ERR(domain->reset), + "Failed to get domain's resets\n"); + pm_runtime_enable(domain->dev); if (domain->bits.map) |