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Date: Tue, 10 Apr 2018 10:39:33 -0700
From: Bjorn Andersson <bjorn.andersson@...aro.org>
To: Taniya Das <tdas@...eaurora.org>
Cc: Stephen Boyd <sboyd@...eaurora.org>,
Michael Turquette <mturquette@...libre.com>,
Andy Gross <andy.gross@...aro.org>,
David Brown <david.brown@...aro.org>,
Rajendra Nayak <rnayak@...eaurora.org>,
Odelu Kukatla <okukatla@...eaurora.org>,
Amit Nischal <anischal@...eaurora.org>,
linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, David Collins <collinsd@...eaurora.org>
Subject: Re: [[PATCH v2] 1/2] clk: qcom: clk-rpmh: Add QCOM RPMh clock driver
On Sun 08 Apr 03:32 PDT 2018, Taniya Das wrote:
> From: Amit Nischal <anischal@...eaurora.org>
>
> Add the RPMh clock driver to control the RPMh managed clock resources on
> some of the Qualcomm Technologies, Inc. SoCs.
>
> Signed-off-by: David Collins <collinsd@...eaurora.org>
> Signed-off-by: Amit Nischal <anischal@...eaurora.org>
> Signed-off-by: Taniya Das <tdas@...eaurora.org>
> ---
> drivers/clk/qcom/Kconfig | 9 +
> drivers/clk/qcom/Makefile | 1 +
> drivers/clk/qcom/clk-rpmh.c | 394 ++++++++++++++++++++++++++++++++++
> include/dt-bindings/clock/qcom,rpmh.h | 25 +++
> 4 files changed, 429 insertions(+)
> create mode 100644 drivers/clk/qcom/clk-rpmh.c
> create mode 100644 include/dt-bindings/clock/qcom,rpmh.h
>
> diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
> index fbf4532..3697a6a 100644
> --- a/drivers/clk/qcom/Kconfig
> +++ b/drivers/clk/qcom/Kconfig
> @@ -112,6 +112,15 @@ config IPQ_GCC_8074
> i2c, USB, SD/eMMC, etc. Select this for the root clock
> of ipq8074.
>
> +config MSM_CLK_RPMH
QCOM_CLK_RPMH
> + tristate "RPMh Clock Driver"
> + depends on COMMON_CLK_QCOM && QCOM_RPMH
> + help
> + RPMh manages shared resources on some Qualcomm Technologies, Inc.
> + SoCs. It accepts requests from other hardware subsystems via RSC.
> + Say Y if you want to support the clocks exposed by RPMh on
> + platforms such as sdm845.
> +
> config MSM_GCC_8660
> tristate "MSM8660 Global Clock Controller"
> depends on COMMON_CLK_QCOM
> diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
> index 230332c..b7da05b 100644
> --- a/drivers/clk/qcom/Makefile
> +++ b/drivers/clk/qcom/Makefile
> @@ -23,6 +23,7 @@ obj-$(CONFIG_IPQ_GCC_8074) += gcc-ipq8074.o
> obj-$(CONFIG_IPQ_LCC_806X) += lcc-ipq806x.o
> obj-$(CONFIG_MDM_GCC_9615) += gcc-mdm9615.o
> obj-$(CONFIG_MDM_LCC_9615) += lcc-mdm9615.o
> +obj-$(CONFIG_MSM_CLK_RPMH) += clk-rpmh.o
> obj-$(CONFIG_MSM_GCC_8660) += gcc-msm8660.o
> obj-$(CONFIG_MSM_GCC_8916) += gcc-msm8916.o
> obj-$(CONFIG_MSM_GCC_8960) += gcc-msm8960.o
> diff --git a/drivers/clk/qcom/clk-rpmh.c b/drivers/clk/qcom/clk-rpmh.c
> new file mode 100644
> index 0000000..763401f
> --- /dev/null
> +++ b/drivers/clk/qcom/clk-rpmh.c
> @@ -0,0 +1,394 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/err.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
Unused
> +#include <soc/qcom/cmd-db.h>
> +#include <soc/qcom/rpmh.h>
> +
> +#include <dt-bindings/clock/qcom,rpmh.h>
> +
> +#include "common.h"
> +#include "clk-regmap.h"
Unused
> +
> +#define CLK_RPMH_ARC_EN_OFFSET 0
> +#define CLK_RPMH_VRM_EN_OFFSET 4
> +#define CLK_RPMH_VRM_OFF_VAL 0
> +#define CLK_RPMH_VRM_ON_VAL 1
Use a bool (true/false) rather than lugging around these two defines.
> +#define CLK_RPMH_APPS_RSC_AO_STATE_MASK (BIT(RPMH_WAKE_ONLY_STATE) | \
> + BIT(RPMH_ACTIVE_ONLY_STATE))
> +#define CLK_RPMH_APPS_RSC_STATE_MASK (BIT(RPMH_WAKE_ONLY_STATE) | \
> + BIT(RPMH_ACTIVE_ONLY_STATE) | \
> + BIT(RPMH_SLEEP_STATE))
> +struct clk_rpmh {
> + struct clk_hw hw;
> + const char *res_name;
> + u32 res_addr;
> + u32 res_en_offset;
> + u32 res_on_val;
> + u32 res_off_val;
res_off_val is 0 for all clocks.
> + u32 state;
> + u32 aggr_state;
> + u32 last_sent_aggr_state;
Through the use of some local variables you shouldn't have to lug around
aggr_state and last_sent_aggr_state.
> + u32 valid_state_mask;
> + struct rpmh_client *rpmh_client;
> + unsigned long rate;
> + struct clk_rpmh *peer;
> +};
> +
> +struct rpmh_cc {
> + struct clk_onecell_data data;
> + struct clk *clks[];
> +};
> +
> +struct clk_rpmh_desc {
> + struct clk_hw **clks;
> + size_t num_clks;
> +};
> +
> +static DEFINE_MUTEX(rpmh_clk_lock);
> +
> +#define __DEFINE_CLK_RPMH(_platform, _name, _name_active, _res_name, \
> + _res_en_offset, _res_on, _res_off, _rate, \
> + _state_mask, _state_on_mask) \
> + static struct clk_rpmh _platform##_##_name_active; \
> + static struct clk_rpmh _platform##_##_name = { \
> + .res_name = _res_name, \
> + .res_en_offset = _res_en_offset, \
> + .res_on_val = _res_on, \
> + .res_off_val = _res_off, \
> + .rate = _rate, \
> + .peer = &_platform##_##_name_active, \
> + .valid_state_mask = _state_mask, \
This is always CLK_RPMH_APPS_RSC_STATE_MASK
> + .hw.init = &(struct clk_init_data){ \
> + .ops = &clk_rpmh_ops, \
> + .name = #_name, \
> + }, \
> + }; \
> + static struct clk_rpmh _platform##_##_name_active = { \
> + .res_name = _res_name, \
> + .res_en_offset = _res_en_offset, \
> + .res_on_val = _res_on, \
> + .res_off_val = _res_off, \
> + .rate = _rate, \
> + .peer = &_platform##_##_name, \
> + .valid_state_mask = _state_on_mask, \
and this is always CLK_RPMH_APPS_RSC_AO_STATE_MASK. If you just hard
code them here (until there's a need for them to be anything else) the
clock list below becomes tidier.
> + .hw.init = &(struct clk_init_data){ \
> + .ops = &clk_rpmh_ops, \
> + .name = #_name_active, \
> + }, \
> + }
> +
> +#define DEFINE_CLK_RPMH_ARC(_platform, _name, _name_active, _res_name, \
> + _res_on, _res_off, _rate, _state_mask, \
> + _state_on_mask) \
> + __DEFINE_CLK_RPMH(_platform, _name, _name_active, _res_name, \
> + CLK_RPMH_ARC_EN_OFFSET, _res_on, _res_off, \
> + _rate, _state_mask, _state_on_mask)
> +
> +#define DEFINE_CLK_RPMH_VRM(_platform, _name, _name_active, _res_name, \
> + _rate, _state_mask, _state_on_mask) \
> + __DEFINE_CLK_RPMH(_platform, _name, _name_active, _res_name, \
> + CLK_RPMH_VRM_EN_OFFSET, CLK_RPMH_VRM_ON_VAL, \
> + CLK_RPMH_VRM_OFF_VAL, _rate, _state_mask, \
> + _state_on_mask)
> +
> +static inline struct clk_rpmh *to_clk_rpmh(struct clk_hw *_hw)
> +{
> + return container_of(_hw, struct clk_rpmh, hw);
> +}
> +
> +static inline bool has_state_changed(struct clk_rpmh *c, u32 state)
> +{
> + return ((c->last_sent_aggr_state & BIT(state))
> + != (c->aggr_state & BIT(state)));
> +}
> +
> +static int clk_rpmh_send_aggregate_command(struct clk_rpmh *c)
> +{
> + struct tcs_cmd cmd = { 0 };
> + int ret = 0;
> +
> + cmd.addr = c->res_addr + c->res_en_offset;
> +
> + if (has_state_changed(c, RPMH_SLEEP_STATE)) {
> + cmd.data = (c->aggr_state & BIT(RPMH_SLEEP_STATE))
> + ? c->res_on_val : c->res_off_val;
As these values are reused several times in this function you could by
using some local variables get this down to the much more readable:
cmd.data = state & BIT(RPMH_SLEEP_STATE) ? on_val : off_val;
And as off_val is 0 for all your clocks you can even drop the latter.
> + ret = rpmh_write_async(c->rpmh_client, RPMH_SLEEP_STATE,
> + &cmd, 1);
> + if (ret) {
> + pr_err("%s: rpmh_write_async(%s, state=%d) failed (%d)\n",
> + __func__, c->res_name, RPMH_SLEEP_STATE, ret);
Please drop the __func__, the error string is unique in this driver; and
rather than passing a constant to a %d actually write your error message
in a human readable form, like: "set sleep state of %s failed: %d\n".
And please do carry the struct device, so that you can use dev_err()
instead.
> + return ret;
> + }
> + }
> +
> + if (has_state_changed(c, RPMH_WAKE_ONLY_STATE)) {
> + cmd.data = (c->aggr_state & BIT(RPMH_WAKE_ONLY_STATE))
> + ? c->res_on_val : c->res_off_val;
> + ret = rpmh_write_async(c->rpmh_client,
> + RPMH_WAKE_ONLY_STATE, &cmd, 1);
> + if (ret) {
> + pr_err("%s: rpmh_write_async(%s, state=%d) failed (%d)\n"
You're missing a , for this to compile.
> + __func__, c->res_name, RPMH_WAKE_ONLY_STATE,
> + ret);
> + return ret;
> + }
> + }
> +
> + if (has_state_changed(c, RPMH_ACTIVE_ONLY_STATE)) {
> + cmd.data = (c->aggr_state & BIT(RPMH_ACTIVE_ONLY_STATE))
> + ? c->res_on_val : c->res_off_val;
> + ret = rpmh_write(c->rpmh_client, RPMH_ACTIVE_ONLY_STATE,
> + &cmd, 1);
> + if (ret) {
> + pr_err("%s: rpmh_write(%s, state=%d) failed (%d)\n",
> + __func__, c->res_name, RPMH_ACTIVE_ONLY_STATE,
> + ret);
> + return ret;
> + }
> + }
But, RPMH_SLEEP_STATE, RPMH_WAKE_ONLY_STATE and RPMH_ACTIVE_ONLY_STATE
are values in an enum, so you could roll these up in a for loop and
reduce the duplication.
> +
> + c->last_sent_aggr_state = c->aggr_state;
> + c->peer->last_sent_aggr_state = c->last_sent_aggr_state;
> +
> + return 0;
> +}
> +
> +static int clk_rpmh_aggregate_state_send_command(struct clk_rpmh *c,
> + bool enable)
> +{
> + /* Update state and aggregate state values based on enable value. */
> + c->state = enable ? c->valid_state_mask : 0;
> + c->aggr_state = c->state | c->peer->state;
> + c->peer->aggr_state = c->aggr_state;
> +
> + ret = clk_rpmh_send_aggregate_command(c);
"ret" doesn't exist.
> + if (ret && enable)
> + c->state = 0;
> + else if (ret) {
If you have any part of your conditional wrapped in braces do wrap all
the others too.
> + c->state = c->valid_state_mask;
> + WARN(1, "clk: %s failed to disable\n", c->res_name);
> + }
> +
> + return ret;
> +}
> +
> +static int clk_rpmh_prepare(struct clk_hw *hw)
> +{
> + struct clk_rpmh *c = to_clk_rpmh(hw);
> + int ret = 0;
> +
> + mutex_lock(&rpmh_clk_lock);
> +
> + if (c->state)
> + goto out;
> +
> + ret = clk_rpmh_aggregate_state_send_command(c, true);
> +out:
> + mutex_unlock(&rpmh_clk_lock);
> + return ret;
> +};
> +
> +static void clk_rpmh_unprepare(struct clk_hw *hw)
> +{
> + struct clk_rpmh *c = to_clk_rpmh(hw);
> +
> + mutex_lock(&rpmh_clk_lock);
> +
> + if (!c->state)
> + goto out;
> +
> + clk_rpmh_aggregate_state_send_command(c, false);
> +out:
> + mutex_unlock(&rpmh_clk_lock);
> + return;
> +};
> +
> +static unsigned long clk_rpmh_recalc_rate(struct clk_hw *hw,
> + unsigned long parent_rate)
> +{
> + struct clk_rpmh *r = to_clk_rpmh(hw);
> +
> + /*
> + * RPMh clocks have a fixed rate. Return static rate set
> + * at init time.
> + */
> + return r->rate;
> +}
> +
> +static const struct clk_ops clk_rpmh_ops = {
> + .prepare = clk_rpmh_prepare,
> + .unprepare = clk_rpmh_unprepare,
> + .recalc_rate = clk_rpmh_recalc_rate,
> +};
> +
> +/* Resource name must match resource id present in cmd-db. */
> +DEFINE_CLK_RPMH_ARC(sdm845, bi_tcxo, bi_tcxo_ao, "xo.lvl", 0x3, 0x0,
> + 19200000, CLK_RPMH_APPS_RSC_STATE_MASK,
> + CLK_RPMH_APPS_RSC_AO_STATE_MASK);
> +DEFINE_CLK_RPMH_VRM(sdm845, ln_bb_clk2, ln_bb_clk2_ao, "lnbclka2",
> + 19200000, CLK_RPMH_APPS_RSC_STATE_MASK,
> + CLK_RPMH_APPS_RSC_AO_STATE_MASK);
> +DEFINE_CLK_RPMH_VRM(sdm845, ln_bb_clk3, ln_bb_clk3_ao, "lnbclka3",
> + 19200000, CLK_RPMH_APPS_RSC_STATE_MASK,
> + CLK_RPMH_APPS_RSC_AO_STATE_MASK);
> +DEFINE_CLK_RPMH_VRM(sdm845, rf_clk1, rf_clk1_ao, "rfclka1",
> + 38400000, CLK_RPMH_APPS_RSC_STATE_MASK,
> + CLK_RPMH_APPS_RSC_AO_STATE_MASK);
> +DEFINE_CLK_RPMH_VRM(sdm845, rf_clk2, rf_clk2_ao, "rfclka2",
> + 38400000, CLK_RPMH_APPS_RSC_STATE_MASK,
> + CLK_RPMH_APPS_RSC_AO_STATE_MASK);
> +DEFINE_CLK_RPMH_VRM(sdm845, rf_clk3, rf_clk3_ao, "rfclka3",
> + 38400000, CLK_RPMH_APPS_RSC_STATE_MASK,
> + CLK_RPMH_APPS_RSC_AO_STATE_MASK);
> +
> +static struct clk_hw *sdm845_rpmh_clocks[] = {
> + [RPMH_CXO_CLK] = &sdm845_bi_tcxo.hw,
> + [RPMH_CXO_CLK_A] = &sdm845_bi_tcxo_ao.hw,
Registering these fails with EEXIST because the gcc driver also register
them.
> + [RPMH_LN_BB_CLK2] = &sdm845_ln_bb_clk2.hw,
> + [RPMH_LN_BB_CLK2_A] = &sdm845_ln_bb_clk2_ao.hw,
> + [RPMH_LN_BB_CLK3] = &sdm845_ln_bb_clk3.hw,
> + [RPMH_LN_BB_CLK3_A] = &sdm845_ln_bb_clk3_ao.hw,
> + [RPMH_RF_CLK1] = &sdm845_rf_clk1.hw,
> + [RPMH_RF_CLK1_A] = &sdm845_rf_clk1_ao.hw,
> + [RPMH_RF_CLK2] = &sdm845_rf_clk2.hw,
> + [RPMH_RF_CLK2_A] = &sdm845_rf_clk2_ao.hw,
> + [RPMH_RF_CLK3] = &sdm845_rf_clk3.hw,
> + [RPMH_RF_CLK3_A] = &sdm845_rf_clk3_ao.hw,
> +};
> +
> +static const struct clk_rpmh_desc clk_rpmh_sdm845 = {
> + .clks = sdm845_rpmh_clocks,
> + .num_clks = ARRAY_SIZE(sdm845_rpmh_clocks),
> +};
> +
> +static const struct of_device_id clk_rpmh_match_table[] = {
> + { .compatible = "qcom,rpmh-clk-sdm845", .data = &clk_rpmh_sdm845},
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, clk_rpmh_match_table);
Please move the match_table just prior to the definition of your
platform_driver.
> +
> +static int clk_rpmh_probe(struct platform_device *pdev)
> +{
> + struct clk **clks;
> + struct clk *clk;
> + struct rpmh_cc *rcc;
> + struct clk_onecell_data *data;
> + int ret;
> + size_t num_clks, i;
> + struct clk_hw **hw_clks;
> + struct clk_rpmh *rpmh_clk;
> + const struct clk_rpmh_desc *desc;
> + struct property *prop;
prop is unused.
> + struct rpmh_client *rpmh_client = NULL;
Don't goto err until you have acquired rpmh_client and you don't need to
initialize this variable.
> +
> + desc = of_device_get_match_data(&pdev->dev);
> + if (!desc) {
> + ret = -EINVAL;
> + goto err;
> + }
This won't happen, no need to check for it.
> +
> + ret = cmd_db_ready();
> + if (ret) {
> + if (ret != -EPROBE_DEFER) {
> + dev_err(&pdev->dev, "Command DB not available (%d)\n",
> + ret);
> + goto err;
goto err? There's nothing to clean up at this point.
> + }
> + return ret;
> + }
> +
> + rpmh_client = rpmh_get_client(pdev);
> + if (IS_ERR(rpmh_client)) {
> + ret = PTR_ERR(rpmh_client);
> + if (ret != -EPROBE_DEFER)
You're getting a handle to your parent, it's not going to return
-EPROBE_DEFER.
> + dev_err(&pdev->dev, "failed to request RPMh client, ret=%d\n",
> + ret);
> + return ret;
> + }
> +
> + hw_clks = desc->clks;
> + num_clks = desc->num_clks;
> +
> + rcc = devm_kzalloc(&pdev->dev, sizeof(*rcc) + sizeof(*clks) * num_clks,
> + GFP_KERNEL);
> + if (!rcc) {
> + ret = -ENOMEM;
> + goto err;
> + }
> +
> + clks = rcc->clks;
> + data = &rcc->data;
> + data->clks = clks;
> + data->clk_num = num_clks;
> +
> + for (i = 0; i < num_clks; i++) {
> + rpmh_clk = to_clk_rpmh(hw_clks[i]);
> + rpmh_clk->res_addr = cmd_db_read_addr(rpmh_clk->res_name);
> + if (!rpmh_clk->res_addr) {
> + dev_err(&pdev->dev, "missing RPMh resource address for %s\n",
> + rpmh_clk->res_name);
> + ret = -ENODEV;
> + goto err;
> + }
> +
> + rpmh_clk->rpmh_client = rpmh_client;
> +
> + clk = devm_clk_register(&pdev->dev, hw_clks[i]);
> + if (IS_ERR(clk)) {
Please add:
dev_err(&pdev->dev, "failed to register %s\n", hw_clks[i]->init->name);
> + ret = PTR_ERR(clk);
> + goto err;
> + }
> +
> + clks[i] = clk;
> + }
> +
> + ret = of_clk_add_provider(pdev->dev.of_node, of_clk_src_onecell_get,
> + data);
> + if (ret)
Please add:
dev_err(&pdev->dev, "failed to add clock provider\n");
> + goto err;
> +
> + dev_info(&pdev->dev, "Registered RPMh clocks\n");
Please don't spam the kernel log.
> + return ret;
ret can't be anything but 0 here, so let's make it easer to read by
writing 0 here.
> +
> +err:
> + if (rpmh_client)
> + rpmh_release(rpmh_client);
This is annoying (but not your fault).
> +
> + dev_err(&pdev->dev, "Error registering RPMh Clock driver (%d)\n", ret);
Testing the driver I got this error message, it didn't help! Had to add
the two dev_err above, just drop this one.
> + return ret;
> +}
> +
> +static struct platform_driver clk_rpmh_driver = {
> + .probe = clk_rpmh_probe,
Your driver is tristate and works just fine as a kernel module, so you
need a remove function to call rpmh_release(rpmh_client) - or we need to
get rid of the need to call that.
> + .driver = {
> + .name = "clk-rpmh",
> + .of_match_table = clk_rpmh_match_table,
> + },
> +};
> +
> +static int __init clk_rpmh_init(void)
> +{
> + return platform_driver_register(&clk_rpmh_driver);
> +}
> +subsys_initcall(clk_rpmh_init);
> +
> +static void __exit clk_rpmh_exit(void)
> +{
> + platform_driver_unregister(&clk_rpmh_driver);
> +}
> +module_exit(clk_rpmh_exit);
> +
> +MODULE_DESCRIPTION("QTI RPMh Clock Driver");
We use "Qualcomm" or "QCOM" in all existing driver, can you please use
that here too?
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:clk-rpmh");
Nothing is going to attempt to autoload a driver based on the alias
platform:clk-rpmh, so just drop this.
Regards,
Bjorn
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