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linux-next/drivers/remoteproc/qcom_wcnss_iris.c
Bjorn Andersson 1fcef985c8 remoteproc: qcom: wcnss: Fix race with iris probe
The remoteproc driver is split between the responsibilities of getting
the SoC-internal ARM core up and running and the external RF (aka
"Iris") part configured.

In order to satisfy the regulator framework's need of a struct device *
to look up supplies this was implemented as two different drivers, using
of_platform_populate() in the remoteproc part to probe the iris part.

Unfortunately it's possible that the iris part probe defers on yet not
available regulators and an attempt to start the remoteproc will have to
be rejected, until this has been resolved. But there's no useful
mechanism of knowing when this would be.

Instead replace the of_platform_populate() and the iris probe with a
function that rolls its own struct device, with the relevant of_node
associated that is enough to acquire regulators and clocks specified in
the DT node and that may propagate the EPROBE_DEFER back to the wcnss
device's probe.

Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reported-by: Anibal Limon <anibal.limon@linaro.org>
Reported-by: Loic Poulain <loic.poulain@linaro.org>
Tested-by: Anibal Limon <anibal.limon@linaro.org>
Link: https://lore.kernel.org/r/20210312002251.3273013-1-bjorn.andersson@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2021-07-28 14:57:30 -05:00

207 lines
4.7 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Qualcomm Wireless Connectivity Subsystem Iris driver
*
* Copyright (C) 2016 Linaro Ltd
* Copyright (C) 2014 Sony Mobile Communications AB
* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
*/
#include <linux/clk.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include "qcom_wcnss.h"
struct qcom_iris {
struct device dev;
struct clk *xo_clk;
struct regulator_bulk_data *vregs;
size_t num_vregs;
};
struct iris_data {
const struct wcnss_vreg_info *vregs;
size_t num_vregs;
bool use_48mhz_xo;
};
static const struct iris_data wcn3620_data = {
.vregs = (struct wcnss_vreg_info[]) {
{ "vddxo", 1800000, 1800000, 10000 },
{ "vddrfa", 1300000, 1300000, 100000 },
{ "vddpa", 3300000, 3300000, 515000 },
{ "vdddig", 1800000, 1800000, 10000 },
},
.num_vregs = 4,
.use_48mhz_xo = false,
};
static const struct iris_data wcn3660_data = {
.vregs = (struct wcnss_vreg_info[]) {
{ "vddxo", 1800000, 1800000, 10000 },
{ "vddrfa", 1300000, 1300000, 100000 },
{ "vddpa", 2900000, 3000000, 515000 },
{ "vdddig", 1200000, 1225000, 10000 },
},
.num_vregs = 4,
.use_48mhz_xo = true,
};
static const struct iris_data wcn3680_data = {
.vregs = (struct wcnss_vreg_info[]) {
{ "vddxo", 1800000, 1800000, 10000 },
{ "vddrfa", 1300000, 1300000, 100000 },
{ "vddpa", 3300000, 3300000, 515000 },
{ "vdddig", 1800000, 1800000, 10000 },
},
.num_vregs = 4,
.use_48mhz_xo = true,
};
int qcom_iris_enable(struct qcom_iris *iris)
{
int ret;
ret = regulator_bulk_enable(iris->num_vregs, iris->vregs);
if (ret)
return ret;
ret = clk_prepare_enable(iris->xo_clk);
if (ret) {
dev_err(&iris->dev, "failed to enable xo clk\n");
goto disable_regulators;
}
return 0;
disable_regulators:
regulator_bulk_disable(iris->num_vregs, iris->vregs);
return ret;
}
void qcom_iris_disable(struct qcom_iris *iris)
{
clk_disable_unprepare(iris->xo_clk);
regulator_bulk_disable(iris->num_vregs, iris->vregs);
}
static const struct of_device_id iris_of_match[] = {
{ .compatible = "qcom,wcn3620", .data = &wcn3620_data },
{ .compatible = "qcom,wcn3660", .data = &wcn3660_data },
{ .compatible = "qcom,wcn3660b", .data = &wcn3680_data },
{ .compatible = "qcom,wcn3680", .data = &wcn3680_data },
{}
};
static void qcom_iris_release(struct device *dev)
{
struct qcom_iris *iris = container_of(dev, struct qcom_iris, dev);
of_node_put(iris->dev.of_node);
kfree(iris);
}
struct qcom_iris *qcom_iris_probe(struct device *parent, bool *use_48mhz_xo)
{
const struct of_device_id *match;
const struct iris_data *data;
struct device_node *of_node;
struct qcom_iris *iris;
int ret;
int i;
of_node = of_get_child_by_name(parent->of_node, "iris");
if (!of_node) {
dev_err(parent, "No child node \"iris\" found\n");
return ERR_PTR(-EINVAL);
}
iris = kzalloc(sizeof(*iris), GFP_KERNEL);
if (!iris) {
of_node_put(of_node);
return ERR_PTR(-ENOMEM);
}
device_initialize(&iris->dev);
iris->dev.parent = parent;
iris->dev.release = qcom_iris_release;
iris->dev.of_node = of_node;
dev_set_name(&iris->dev, "%s.iris", dev_name(parent));
ret = device_add(&iris->dev);
if (ret) {
put_device(&iris->dev);
return ERR_PTR(ret);
}
match = of_match_device(iris_of_match, &iris->dev);
if (!match) {
dev_err(&iris->dev, "no matching compatible for iris\n");
ret = -EINVAL;
goto err_device_del;
}
data = match->data;
iris->xo_clk = devm_clk_get(&iris->dev, "xo");
if (IS_ERR(iris->xo_clk)) {
ret = PTR_ERR(iris->xo_clk);
if (ret != -EPROBE_DEFER)
dev_err(&iris->dev, "failed to acquire xo clk\n");
goto err_device_del;
}
iris->num_vregs = data->num_vregs;
iris->vregs = devm_kcalloc(&iris->dev,
iris->num_vregs,
sizeof(struct regulator_bulk_data),
GFP_KERNEL);
if (!iris->vregs) {
ret = -ENOMEM;
goto err_device_del;
}
for (i = 0; i < iris->num_vregs; i++)
iris->vregs[i].supply = data->vregs[i].name;
ret = devm_regulator_bulk_get(&iris->dev, iris->num_vregs, iris->vregs);
if (ret) {
dev_err(&iris->dev, "failed to get regulators\n");
goto err_device_del;
}
for (i = 0; i < iris->num_vregs; i++) {
if (data->vregs[i].max_voltage)
regulator_set_voltage(iris->vregs[i].consumer,
data->vregs[i].min_voltage,
data->vregs[i].max_voltage);
if (data->vregs[i].load_uA)
regulator_set_load(iris->vregs[i].consumer,
data->vregs[i].load_uA);
}
*use_48mhz_xo = data->use_48mhz_xo;
return iris;
err_device_del:
device_del(&iris->dev);
return ERR_PTR(ret);
}
void qcom_iris_remove(struct qcom_iris *iris)
{
device_del(&iris->dev);
}