Re: [PATCH 09/16] soc: imx: gpcv2: add support for optional resets
From: Frieder Schrempf <hidden>
Date: 2021-05-03 14:30:12
Also in:
linux-devicetree, lkml
On 29.04.21 09:30, Peng Fan (OSS) wrote:
quoted hunk ↗ jump to hunk
From: Lucas Stach <l.stach@pengutronix.de> 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. Signed-off-by: Lucas Stach <l.stach@pengutronix.de> --- drivers/soc/imx/gpcv2.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c index 640f4165cfba..4a2c2a255d1a 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, 0); } + /* 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,@@ -531,11 +540,17 @@ static int imx_pgc_domain_probe(struct platform_device *pdev) domain->voltage, domain->voltage); } +
Spurious blank line. Otherwise: Reviewed-by: Frieder Schrempf <redacted>
domain->num_clks = devm_clk_bulk_get_all(domain->dev, &domain->clks); if (domain->num_clks < 0) 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)
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