Commit fe58c887 authored by Lucas Stach's avatar Lucas Stach Committed by Shawn Guo
Browse files

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: default avatarFrieder Schrempf <frieder.schrempf@kontron.de>
Reviewed-by: default avatarFrieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: default avatarLucas Stach <l.stach@pengutronix.de>
Signed-off-by: default avatarPeng Fan <peng.fan@nxp.com>
Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
parent c0ce7539

drivers/soc/imx/gpcv2.c

+14 −0
Original line number Diff line number Diff line
@@ -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)