Some power domains require extra voltages to be applied. For example
trying to enable the GPU domain on RK3588 fails when the SoC does not
have VDD GPU enabled.
The solution to temporarily change the device's device tree node has
been taken over from the Mediatek power domain driver.
The regulator is not acquired at probe time, since that creates circular
dependencies. The power domain driver must be probed early, since SoC
peripherals need it. Regulators on the other hand depend on SoC
peripherals like SPI, I2C or GPIO.
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
drivers/pmdomain/rockchip/pm-domains.c | 57 +++++++++++++++++++++++++-
1 file changed, 55 insertions(+), 2 deletions(-)
diff --git a/drivers/pmdomain/rockchip/pm-domains.c b/drivers/pmdomain/rockchip/pm-domains.c
index 663d390faaeb..ae6990897928 100644
--- a/drivers/pmdomain/rockchip/pm-domains.c
+++ b/drivers/pmdomain/rockchip/pm-domains.c
@@ -18,6 +18,7 @@
#include <linux/of_clk.h>
#include <linux/clk.h>
#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
#include <linux/mfd/syscon.h>
#include <soc/rockchip/pm_domains.h>
#include <dt-bindings/power/px30-power.h>
@@ -89,6 +90,8 @@ struct rockchip_pm_domain {
u32 *qos_save_regs[MAX_QOS_REGS_NUM];
int num_clks;
struct clk_bulk_data *clks;
+ struct device_node *node;
+ struct regulator *supply;
};
struct rockchip_pmu {
@@ -571,18 +574,67 @@ static int rockchip_pd_power(struct rockchip_pm_domain *pd, bool power_on)
return 0;
}
+static int rockchip_pd_regulator_disable(struct rockchip_pm_domain *pd)
+{
+ return pd->supply ? regulator_disable(pd->supply) : 0;
+}
+
+
+static int rockchip_pd_regulator_enable(struct rockchip_pm_domain *pd)
+{
+ struct rockchip_pmu *pmu = pd->pmu;
+ struct device_node *main_node;
+
+ if (!pd->supply) {
+ /*
+ * Find regulator in current power domain node.
+ * devm_regulator_get() finds regulator in a node and its child
+ * node, so set of_node to current power domain node then change
+ * back to original node after regulator is found for current
+ * power domain node.
+ */
+ main_node = pmu->dev->of_node;
+ pmu->dev->of_node = pd->node;
+ pd->supply = devm_regulator_get(pmu->dev, "domain");
+ pmu->dev->of_node = main_node;
+ if (IS_ERR(pd->supply)) {
+ pd->supply = NULL;
+ return 0;
+ }
+ }
+
+ return regulator_enable(pd->supply);
+}
+
static int rockchip_pd_power_on(struct generic_pm_domain *domain)
{
struct rockchip_pm_domain *pd = to_rockchip_pd(domain);
+ int ret;
+
+ ret = rockchip_pd_regulator_enable(pd);
+ if (ret) {
+ dev_err(pd->pmu->dev, "Failed to enable supply: %d\n", ret);
+ return ret;
+ }
- return rockchip_pd_power(pd, true);
+ ret = rockchip_pd_power(pd, true);
+ if (ret)
+ rockchip_pd_regulator_disable(pd);
+
+ return ret;
}
static int rockchip_pd_power_off(struct generic_pm_domain *domain)
{
struct rockchip_pm_domain *pd = to_rockchip_pd(domain);
+ int ret;
- return rockchip_pd_power(pd, false);
+ ret = rockchip_pd_power(pd, false);
+ if (ret)
+ return ret;
+
+ rockchip_pd_regulator_disable(pd);
+ return ret;
}
static int rockchip_pd_attach_dev(struct generic_pm_domain *genpd,
@@ -663,6 +715,7 @@ static int rockchip_pm_add_one_domain(struct rockchip_pmu *pmu,
pd->info = pd_info;
pd->pmu = pmu;
+ pd->node = node;
pd->num_clks = of_clk_get_parent_count(node);
if (pd->num_clks > 0) {
--
2.45.2Am Dienstag, 10. September 2024, 19:57:14 CEST schrieb Sebastian Reichel:
> Some power domains require extra voltages to be applied. For example
> trying to enable the GPU domain on RK3588 fails when the SoC does not
> have VDD GPU enabled.
>
> The solution to temporarily change the device's device tree node has
> been taken over from the Mediatek power domain driver.
>
> The regulator is not acquired at probe time, since that creates circular
> dependencies. The power domain driver must be probed early, since SoC
> peripherals need it. Regulators on the other hand depend on SoC
> peripherals like SPI, I2C or GPIO.
>
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> ---
> drivers/pmdomain/rockchip/pm-domains.c | 57 +++++++++++++++++++++++++-
> 1 file changed, 55 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pmdomain/rockchip/pm-domains.c b/drivers/pmdomain/rockchip/pm-domains.c
> index 663d390faaeb..ae6990897928 100644
> --- a/drivers/pmdomain/rockchip/pm-domains.c
> +++ b/drivers/pmdomain/rockchip/pm-domains.c
> @@ -18,6 +18,7 @@
> #include <linux/of_clk.h>
> #include <linux/clk.h>
> #include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> #include <linux/mfd/syscon.h>
> #include <soc/rockchip/pm_domains.h>
> #include <dt-bindings/power/px30-power.h>
> @@ -89,6 +90,8 @@ struct rockchip_pm_domain {
> u32 *qos_save_regs[MAX_QOS_REGS_NUM];
> int num_clks;
> struct clk_bulk_data *clks;
> + struct device_node *node;
> + struct regulator *supply;
> };
>
> struct rockchip_pmu {
> @@ -571,18 +574,67 @@ static int rockchip_pd_power(struct rockchip_pm_domain *pd, bool power_on)
> return 0;
> }
>
> +static int rockchip_pd_regulator_disable(struct rockchip_pm_domain *pd)
> +{
> + return pd->supply ? regulator_disable(pd->supply) : 0;
> +}
> +
> +
nit: double-empty line
other than that, this looks ok for the time being and as Sebastian
mentioned in Vienna, this also blocks actually testing
the Panthor-GPU driver right now.
So while we will likely convert to the hopefully soon existing
regulator stuff, this change is helpful for right now
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Am Dienstag, 10. September 2024, 19:57:14 CEST schrieb Sebastian Reichel:
> Some power domains require extra voltages to be applied. For example
> trying to enable the GPU domain on RK3588 fails when the SoC does not
> have VDD GPU enabled.
>
> The solution to temporarily change the device's device tree node has
> been taken over from the Mediatek power domain driver.
>
> The regulator is not acquired at probe time, since that creates circular
> dependencies. The power domain driver must be probed early, since SoC
> peripherals need it. Regulators on the other hand depend on SoC
> peripherals like SPI, I2C or GPIO.
>
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
It does look like Chen-Yu Tsai is working on a similar problem [0].
I.e. this really is a hack, so I started looking around the regulator API
and found of_regulator_bulk_get existing but unused that already
operates on a of-node.
Googling further I stumbled upon the linked patch from some days
ago ;-) . So maybe that could be a cleaner way forward?
[0] https://patchwork.kernel.org/project/linux-mediatek/patch/20240904090016.2841572-6-wenst@chromium.org/
> ---
> drivers/pmdomain/rockchip/pm-domains.c | 57 +++++++++++++++++++++++++-
> 1 file changed, 55 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pmdomain/rockchip/pm-domains.c b/drivers/pmdomain/rockchip/pm-domains.c
> index 663d390faaeb..ae6990897928 100644
> --- a/drivers/pmdomain/rockchip/pm-domains.c
> +++ b/drivers/pmdomain/rockchip/pm-domains.c
> @@ -18,6 +18,7 @@
> #include <linux/of_clk.h>
> #include <linux/clk.h>
> #include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> #include <linux/mfd/syscon.h>
> #include <soc/rockchip/pm_domains.h>
> #include <dt-bindings/power/px30-power.h>
> @@ -89,6 +90,8 @@ struct rockchip_pm_domain {
> u32 *qos_save_regs[MAX_QOS_REGS_NUM];
> int num_clks;
> struct clk_bulk_data *clks;
> + struct device_node *node;
> + struct regulator *supply;
> };
>
> struct rockchip_pmu {
> @@ -571,18 +574,67 @@ static int rockchip_pd_power(struct rockchip_pm_domain *pd, bool power_on)
> return 0;
> }
>
> +static int rockchip_pd_regulator_disable(struct rockchip_pm_domain *pd)
> +{
> + return pd->supply ? regulator_disable(pd->supply) : 0;
> +}
> +
> +
> +static int rockchip_pd_regulator_enable(struct rockchip_pm_domain *pd)
> +{
> + struct rockchip_pmu *pmu = pd->pmu;
> + struct device_node *main_node;
> +
> + if (!pd->supply) {
> + /*
> + * Find regulator in current power domain node.
> + * devm_regulator_get() finds regulator in a node and its child
> + * node, so set of_node to current power domain node then change
> + * back to original node after regulator is found for current
> + * power domain node.
> + */
> + main_node = pmu->dev->of_node;
> + pmu->dev->of_node = pd->node;
> + pd->supply = devm_regulator_get(pmu->dev, "domain");
> + pmu->dev->of_node = main_node;
> + if (IS_ERR(pd->supply)) {
> + pd->supply = NULL;
> + return 0;
> + }
> + }
> +
> + return regulator_enable(pd->supply);
> +}
> +
> static int rockchip_pd_power_on(struct generic_pm_domain *domain)
> {
> struct rockchip_pm_domain *pd = to_rockchip_pd(domain);
> + int ret;
> +
> + ret = rockchip_pd_regulator_enable(pd);
> + if (ret) {
> + dev_err(pd->pmu->dev, "Failed to enable supply: %d\n", ret);
> + return ret;
> + }
>
> - return rockchip_pd_power(pd, true);
> + ret = rockchip_pd_power(pd, true);
> + if (ret)
> + rockchip_pd_regulator_disable(pd);
> +
> + return ret;
> }
>
> static int rockchip_pd_power_off(struct generic_pm_domain *domain)
> {
> struct rockchip_pm_domain *pd = to_rockchip_pd(domain);
> + int ret;
>
> - return rockchip_pd_power(pd, false);
> + ret = rockchip_pd_power(pd, false);
> + if (ret)
> + return ret;
> +
> + rockchip_pd_regulator_disable(pd);
> + return ret;
> }
>
> static int rockchip_pd_attach_dev(struct generic_pm_domain *genpd,
> @@ -663,6 +715,7 @@ static int rockchip_pm_add_one_domain(struct rockchip_pmu *pmu,
>
> pd->info = pd_info;
> pd->pmu = pmu;
> + pd->node = node;
>
> pd->num_clks = of_clk_get_parent_count(node);
> if (pd->num_clks > 0) {
>
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