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authorStephan Gerhold <stephan@gerhold.net>2020-09-16 13:41:33 +0300
committerBjorn Andersson <bjorn.andersson@linaro.org>2020-10-26 18:23:11 +0300
commit858bce9c4cddd11088695751e6e30a5230806b06 (patch)
tree1f4aceb9b89c8252564b6cbccc2c6168420b65cb /drivers/remoteproc
parent20a2269c1983aff7894f432b86434ef1738e6d52 (diff)
downloadlinux-858bce9c4cddd11088695751e6e30a5230806b06.tar.xz
remoteproc: qcom_wcnss: Allow replacing regulators with power domains
So far we have been doing all proxy votes by voting for raw voltages/load through the regulator interface. But actually VDDCX and VDDMX represent power domains that should be preferably managed using corner votes through the power domain interface. Looking closer the code was actually never doing the proxy votes correctly: The vddcx regulator is specified as: { "vddcx", .super_turbo = true }, which is supposed to say that we should vote for the maximum corner of the VDDCX power domain. But actually "super_turbo" is unused so all we did so far is to enable the power domain. We did not vote for it to scale to the maximum performance state. Using them through the power domain interface allows voting for the maximum performance state. However, we still need to support using them through the regulator interface for old device trees. The way this is implemented here is that we check if attaching the two power domain succeeds. If yes, we skip the first "num_pd_vregs" regulators in the "vregs" list and only request the remaining ones. Signed-off-by: Stephan Gerhold <stephan@gerhold.net> Link: https://lore.kernel.org/r/20200916104135.25085-9-stephan@gerhold.net Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Diffstat (limited to 'drivers/remoteproc')
-rw-r--r--drivers/remoteproc/qcom_wcnss.c109
1 files changed, 93 insertions, 16 deletions
diff --git a/drivers/remoteproc/qcom_wcnss.c b/drivers/remoteproc/qcom_wcnss.c
index e2573f79a137..f95854255c70 100644
--- a/drivers/remoteproc/qcom_wcnss.c
+++ b/drivers/remoteproc/qcom_wcnss.c
@@ -17,6 +17,8 @@
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
#include <linux/qcom_scm.h>
#include <linux/regulator/consumer.h>
#include <linux/remoteproc.h>
@@ -51,12 +53,15 @@
#define WCNSS_PMU_XO_MODE_19p2 0
#define WCNSS_PMU_XO_MODE_48 3
+#define WCNSS_MAX_PDS 2
+
struct wcnss_data {
size_t pmu_offset;
size_t spare_offset;
+ const char *pd_names[WCNSS_MAX_PDS];
const struct wcnss_vreg_info *vregs;
- size_t num_vregs;
+ size_t num_vregs, num_pd_vregs;
};
struct qcom_wcnss {
@@ -80,6 +85,8 @@ struct qcom_wcnss {
struct mutex iris_lock;
struct qcom_iris *iris;
+ struct device *pds[WCNSS_MAX_PDS];
+ size_t num_pds;
struct regulator_bulk_data *vregs;
size_t num_vregs;
@@ -111,24 +118,28 @@ static const struct wcnss_data pronto_v1_data = {
.pmu_offset = 0x1004,
.spare_offset = 0x1088,
+ .pd_names = { "mx", "cx" },
.vregs = (struct wcnss_vreg_info[]) {
{ "vddmx", 950000, 1150000, 0 },
{ "vddcx", .super_turbo = true},
{ "vddpx", 1800000, 1800000, 0 },
},
- .num_vregs = 3,
+ .num_pd_vregs = 2,
+ .num_vregs = 1,
};
static const struct wcnss_data pronto_v2_data = {
.pmu_offset = 0x1004,
.spare_offset = 0x1088,
+ .pd_names = { "mx", "cx" },
.vregs = (struct wcnss_vreg_info[]) {
{ "vddmx", 1287500, 1287500, 0 },
{ "vddcx", .super_turbo = true },
{ "vddpx", 1800000, 1800000, 0 },
},
- .num_vregs = 3,
+ .num_pd_vregs = 2,
+ .num_vregs = 1,
};
void qcom_wcnss_assign_iris(struct qcom_wcnss *wcnss,
@@ -219,7 +230,7 @@ static void wcnss_configure_iris(struct qcom_wcnss *wcnss)
static int wcnss_start(struct rproc *rproc)
{
struct qcom_wcnss *wcnss = (struct qcom_wcnss *)rproc->priv;
- int ret;
+ int ret, i;
mutex_lock(&wcnss->iris_lock);
if (!wcnss->iris) {
@@ -228,9 +239,18 @@ static int wcnss_start(struct rproc *rproc)
goto release_iris_lock;
}
+ for (i = 0; i < wcnss->num_pds; i++) {
+ dev_pm_genpd_set_performance_state(wcnss->pds[i], INT_MAX);
+ ret = pm_runtime_get_sync(wcnss->pds[i]);
+ if (ret < 0) {
+ pm_runtime_put_noidle(wcnss->pds[i]);
+ goto disable_pds;
+ }
+ }
+
ret = regulator_bulk_enable(wcnss->num_vregs, wcnss->vregs);
if (ret)
- goto release_iris_lock;
+ goto disable_pds;
ret = qcom_iris_enable(wcnss->iris);
if (ret)
@@ -262,6 +282,11 @@ disable_iris:
qcom_iris_disable(wcnss->iris);
disable_regulators:
regulator_bulk_disable(wcnss->num_vregs, wcnss->vregs);
+disable_pds:
+ for (i--; i >= 0; i--) {
+ pm_runtime_put(wcnss->pds[i]);
+ dev_pm_genpd_set_performance_state(wcnss->pds[i], 0);
+ }
release_iris_lock:
mutex_unlock(&wcnss->iris_lock);
@@ -371,14 +396,54 @@ static irqreturn_t wcnss_stop_ack_interrupt(int irq, void *dev)
return IRQ_HANDLED;
}
+static int wcnss_init_pds(struct qcom_wcnss *wcnss,
+ const char * const pd_names[WCNSS_MAX_PDS])
+{
+ int i, ret;
+
+ for (i = 0; i < WCNSS_MAX_PDS; i++) {
+ if (!pd_names[i])
+ break;
+
+ wcnss->pds[i] = dev_pm_domain_attach_by_name(wcnss->dev, pd_names[i]);
+ if (IS_ERR_OR_NULL(wcnss->pds[i])) {
+ ret = PTR_ERR(wcnss->pds[i]) ? : -ENODATA;
+ for (i--; i >= 0; i--)
+ dev_pm_domain_detach(wcnss->pds[i], false);
+ return ret;
+ }
+ }
+ wcnss->num_pds = i;
+
+ return 0;
+}
+
+static void wcnss_release_pds(struct qcom_wcnss *wcnss)
+{
+ int i;
+
+ for (i = 0; i < wcnss->num_pds; i++)
+ dev_pm_domain_detach(wcnss->pds[i], false);
+}
+
static int wcnss_init_regulators(struct qcom_wcnss *wcnss,
const struct wcnss_vreg_info *info,
- int num_vregs)
+ int num_vregs, int num_pd_vregs)
{
struct regulator_bulk_data *bulk;
int ret;
int i;
+ /*
+ * If attaching the power domains suceeded we can skip requesting
+ * the regulators for the power domains. For old device trees we need to
+ * reserve extra space to manage them through the regulator interface.
+ */
+ if (wcnss->num_pds)
+ info += num_pd_vregs;
+ else
+ num_vregs += num_pd_vregs;
+
bulk = devm_kcalloc(wcnss->dev,
num_vregs, sizeof(struct regulator_bulk_data),
GFP_KERNEL);
@@ -514,33 +579,42 @@ static int wcnss_probe(struct platform_device *pdev)
wcnss->pmu_cfg = mmio + data->pmu_offset;
wcnss->spare_out = mmio + data->spare_offset;
- ret = wcnss_init_regulators(wcnss, data->vregs, data->num_vregs);
- if (ret)
+ /*
+ * We might need to fallback to regulators instead of power domains
+ * for old device trees. Don't report an error in that case.
+ */
+ ret = wcnss_init_pds(wcnss, data->pd_names);
+ if (ret && (ret != -ENODATA || !data->num_pd_vregs))
goto free_rproc;
+ ret = wcnss_init_regulators(wcnss, data->vregs, data->num_vregs,
+ data->num_pd_vregs);
+ if (ret)
+ goto detach_pds;
+
ret = wcnss_request_irq(wcnss, pdev, "wdog", false, wcnss_wdog_interrupt);
if (ret < 0)
- goto free_rproc;
+ goto detach_pds;
wcnss->wdog_irq = ret;
ret = wcnss_request_irq(wcnss, pdev, "fatal", false, wcnss_fatal_interrupt);
if (ret < 0)
- goto free_rproc;
+ goto detach_pds;
wcnss->fatal_irq = ret;
ret = wcnss_request_irq(wcnss, pdev, "ready", true, wcnss_ready_interrupt);
if (ret < 0)
- goto free_rproc;
+ goto detach_pds;
wcnss->ready_irq = ret;
ret = wcnss_request_irq(wcnss, pdev, "handover", true, wcnss_handover_interrupt);
if (ret < 0)
- goto free_rproc;
+ goto detach_pds;
wcnss->handover_irq = ret;
ret = wcnss_request_irq(wcnss, pdev, "stop-ack", true, wcnss_stop_ack_interrupt);
if (ret < 0)
- goto free_rproc;
+ goto detach_pds;
wcnss->stop_ack_irq = ret;
if (wcnss->stop_ack_irq) {
@@ -548,7 +622,7 @@ static int wcnss_probe(struct platform_device *pdev)
&wcnss->stop_bit);
if (IS_ERR(wcnss->state)) {
ret = PTR_ERR(wcnss->state);
- goto free_rproc;
+ goto detach_pds;
}
}
@@ -556,15 +630,17 @@ static int wcnss_probe(struct platform_device *pdev)
wcnss->sysmon = qcom_add_sysmon_subdev(rproc, "wcnss", WCNSS_SSCTL_ID);
if (IS_ERR(wcnss->sysmon)) {
ret = PTR_ERR(wcnss->sysmon);
- goto free_rproc;
+ goto detach_pds;
}
ret = rproc_add(rproc);
if (ret)
- goto free_rproc;
+ goto detach_pds;
return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
+detach_pds:
+ wcnss_release_pds(wcnss);
free_rproc:
rproc_free(rproc);
@@ -582,6 +658,7 @@ static int wcnss_remove(struct platform_device *pdev)
qcom_remove_sysmon_subdev(wcnss->sysmon);
qcom_remove_smd_subdev(wcnss->rproc, &wcnss->smd_subdev);
+ wcnss_release_pds(wcnss);
rproc_free(wcnss->rproc);
return 0;