Re: [PATCH 05/21] media: atmel: atmel-isc: split the clock code into separate source file

From: Jacopo Mondi
Date: Fri Nov 05 2021 - 05:01:24 EST

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Hi Eugen

On Fri, Oct 22, 2021 at 10:52:31AM +0300, Eugen Hristev wrote:
> The atmel-isc-base is getting crowded. Split the clock functions into
> atmel-isc-clk.c.
>
> Signed-off-by: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
> ---
> drivers/media/platform/atmel/Makefile | 2 +-
> drivers/media/platform/atmel/atmel-isc-base.c | 294 ----------------
> drivers/media/platform/atmel/atmel-isc-clk.c | 316 ++++++++++++++++++
> 3 files changed, 317 insertions(+), 295 deletions(-)
> create mode 100644 drivers/media/platform/atmel/atmel-isc-clk.c
>
> diff --git a/drivers/media/platform/atmel/Makefile b/drivers/media/platform/atmel/Makefile
> index 39f0a7eba702..1f6fe7427769 100644
> --- a/drivers/media/platform/atmel/Makefile
> +++ b/drivers/media/platform/atmel/Makefile
> @@ -3,7 +3,7 @@ atmel-isc-objs = atmel-sama5d2-isc.o
> atmel-xisc-objs = atmel-sama7g5-isc.o
>
> obj-$(CONFIG_VIDEO_ATMEL_ISI) += atmel-isi.o
> -obj-$(CONFIG_VIDEO_ATMEL_ISC_BASE) += atmel-isc-base.o
> +obj-$(CONFIG_VIDEO_ATMEL_ISC_BASE) += atmel-isc-base.o atmel-isc-clk.o
> obj-$(CONFIG_VIDEO_ATMEL_ISC) += atmel-isc.o
> obj-$(CONFIG_VIDEO_ATMEL_XISC) += atmel-xisc.o
> obj-$(CONFIG_VIDEO_MICROCHIP_CSI2DC) += microchip-csi2dc.o
> diff --git a/drivers/media/platform/atmel/atmel-isc-base.c b/drivers/media/platform/atmel/atmel-isc-base.c
> index ebf264b980f9..f532fd03e807 100644
> --- a/drivers/media/platform/atmel/atmel-isc-base.c
> +++ b/drivers/media/platform/atmel/atmel-isc-base.c
> @@ -8,9 +8,6 @@
> * Author: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
> *
> */
> -
> -#include <linux/clk.h>
> -#include <linux/clkdev.h>
> #include <linux/clk-provider.h>

Do you still need clk-provider here ?

> #include <linux/delay.h>
> #include <linux/interrupt.h>
> @@ -100,297 +97,6 @@ static inline void isc_reset_awb_ctrls(struct isc_device *isc)
> }
> }
>
> -static int isc_wait_clk_stable(struct clk_hw *hw)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> - struct regmap *regmap = isc_clk->regmap;
> - unsigned long timeout = jiffies + usecs_to_jiffies(1000);
> - unsigned int status;
> -
> - while (time_before(jiffies, timeout)) {
> - regmap_read(regmap, ISC_CLKSR, &status);
> - if (!(status & ISC_CLKSR_SIP))
> - return 0;
> -
> - usleep_range(10, 250);
> - }
> -
> - return -ETIMEDOUT;
> -}
> -
> -static int isc_clk_prepare(struct clk_hw *hw)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> - int ret;
> -
> - ret = pm_runtime_resume_and_get(isc_clk->dev);
> - if (ret < 0)
> - return ret;
> -
> - return isc_wait_clk_stable(hw);
> -}
> -
> -static void isc_clk_unprepare(struct clk_hw *hw)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> -
> - isc_wait_clk_stable(hw);
> -
> - pm_runtime_put_sync(isc_clk->dev);
> -}
> -
> -static int isc_clk_enable(struct clk_hw *hw)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> - u32 id = isc_clk->id;
> - struct regmap *regmap = isc_clk->regmap;
> - unsigned long flags;
> - unsigned int status;
> -
> - dev_dbg(isc_clk->dev, "ISC CLK: %s, id = %d, div = %d, parent id = %d\n",
> - __func__, id, isc_clk->div, isc_clk->parent_id);
> -
> - spin_lock_irqsave(&isc_clk->lock, flags);
> - regmap_update_bits(regmap, ISC_CLKCFG,
> - ISC_CLKCFG_DIV_MASK(id) | ISC_CLKCFG_SEL_MASK(id),
> - (isc_clk->div << ISC_CLKCFG_DIV_SHIFT(id)) |
> - (isc_clk->parent_id << ISC_CLKCFG_SEL_SHIFT(id)));
> -
> - regmap_write(regmap, ISC_CLKEN, ISC_CLK(id));
> - spin_unlock_irqrestore(&isc_clk->lock, flags);
> -
> - regmap_read(regmap, ISC_CLKSR, &status);
> - if (status & ISC_CLK(id))
> - return 0;
> - else
> - return -EINVAL;
> -}
> -
> -static void isc_clk_disable(struct clk_hw *hw)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> - u32 id = isc_clk->id;
> - unsigned long flags;
> -
> - spin_lock_irqsave(&isc_clk->lock, flags);
> - regmap_write(isc_clk->regmap, ISC_CLKDIS, ISC_CLK(id));
> - spin_unlock_irqrestore(&isc_clk->lock, flags);
> -}
> -
> -static int isc_clk_is_enabled(struct clk_hw *hw)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> - u32 status;
> - int ret;
> -
> - ret = pm_runtime_resume_and_get(isc_clk->dev);
> - if (ret < 0)
> - return 0;
> -
> - regmap_read(isc_clk->regmap, ISC_CLKSR, &status);
> -
> - pm_runtime_put_sync(isc_clk->dev);
> -
> - return status & ISC_CLK(isc_clk->id) ? 1 : 0;
> -}
> -
> -static unsigned long
> -isc_clk_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> -
> - return DIV_ROUND_CLOSEST(parent_rate, isc_clk->div + 1);
> -}
> -
> -static int isc_clk_determine_rate(struct clk_hw *hw,
> - struct clk_rate_request *req)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> - long best_rate = -EINVAL;
> - int best_diff = -1;
> - unsigned int i, div;
> -
> - for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
> - struct clk_hw *parent;
> - unsigned long parent_rate;
> -
> - parent = clk_hw_get_parent_by_index(hw, i);
> - if (!parent)
> - continue;
> -
> - parent_rate = clk_hw_get_rate(parent);
> - if (!parent_rate)
> - continue;
> -
> - for (div = 1; div < ISC_CLK_MAX_DIV + 2; div++) {
> - unsigned long rate;
> - int diff;
> -
> - rate = DIV_ROUND_CLOSEST(parent_rate, div);
> - diff = abs(req->rate - rate);
> -
> - if (best_diff < 0 || best_diff > diff) {
> - best_rate = rate;
> - best_diff = diff;
> - req->best_parent_rate = parent_rate;
> - req->best_parent_hw = parent;
> - }
> -
> - if (!best_diff || rate < req->rate)
> - break;
> - }
> -
> - if (!best_diff)
> - break;
> - }
> -
> - dev_dbg(isc_clk->dev,
> - "ISC CLK: %s, best_rate = %ld, parent clk: %s @ %ld\n",
> - __func__, best_rate,
> - __clk_get_name((req->best_parent_hw)->clk),
> - req->best_parent_rate);
> -
> - if (best_rate < 0)
> - return best_rate;
> -
> - req->rate = best_rate;
> -
> - return 0;
> -}
> -
> -static int isc_clk_set_parent(struct clk_hw *hw, u8 index)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> -
> - if (index >= clk_hw_get_num_parents(hw))
> - return -EINVAL;
> -
> - isc_clk->parent_id = index;
> -
> - return 0;
> -}
> -
> -static u8 isc_clk_get_parent(struct clk_hw *hw)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> -
> - return isc_clk->parent_id;
> -}
> -
> -static int isc_clk_set_rate(struct clk_hw *hw,
> - unsigned long rate,
> - unsigned long parent_rate)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> - u32 div;
> -
> - if (!rate)
> - return -EINVAL;
> -
> - div = DIV_ROUND_CLOSEST(parent_rate, rate);
> - if (div > (ISC_CLK_MAX_DIV + 1) || !div)
> - return -EINVAL;
> -
> - isc_clk->div = div - 1;
> -
> - return 0;
> -}
> -
> -static const struct clk_ops isc_clk_ops = {
> - .prepare = isc_clk_prepare,
> - .unprepare = isc_clk_unprepare,
> - .enable = isc_clk_enable,
> - .disable = isc_clk_disable,
> - .is_enabled = isc_clk_is_enabled,
> - .recalc_rate = isc_clk_recalc_rate,
> - .determine_rate = isc_clk_determine_rate,
> - .set_parent = isc_clk_set_parent,
> - .get_parent = isc_clk_get_parent,
> - .set_rate = isc_clk_set_rate,
> -};
> -
> -static int isc_clk_register(struct isc_device *isc, unsigned int id)
> -{
> - struct regmap *regmap = isc->regmap;
> - struct device_node *np = isc->dev->of_node;
> - struct isc_clk *isc_clk;
> - struct clk_init_data init;
> - const char *clk_name = np->name;
> - const char *parent_names[3];
> - int num_parents;
> -
> - if (id == ISC_ISPCK && !isc->ispck_required)
> - return 0;
> -
> - num_parents = of_clk_get_parent_count(np);
> - if (num_parents < 1 || num_parents > 3)
> - return -EINVAL;
> -
> - if (num_parents > 2 && id == ISC_ISPCK)
> - num_parents = 2;
> -
> - of_clk_parent_fill(np, parent_names, num_parents);
> -
> - if (id == ISC_MCK)
> - of_property_read_string(np, "clock-output-names", &clk_name);
> - else
> - clk_name = "isc-ispck";
> -
> - init.parent_names = parent_names;
> - init.num_parents = num_parents;
> - init.name = clk_name;
> - init.ops = &isc_clk_ops;
> - init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
> -
> - isc_clk = &isc->isc_clks[id];
> - isc_clk->hw.init = &init;
> - isc_clk->regmap = regmap;
> - isc_clk->id = id;
> - isc_clk->dev = isc->dev;
> - spin_lock_init(&isc_clk->lock);
> -
> - isc_clk->clk = clk_register(isc->dev, &isc_clk->hw);
> - if (IS_ERR(isc_clk->clk)) {
> - dev_err(isc->dev, "%s: clock register fail\n", clk_name);
> - return PTR_ERR(isc_clk->clk);
> - } else if (id == ISC_MCK)
> - of_clk_add_provider(np, of_clk_src_simple_get, isc_clk->clk);
> -
> - return 0;
> -}
> -
> -int isc_clk_init(struct isc_device *isc)
> -{
> - unsigned int i;
> - int ret;
> -
> - for (i = 0; i < ARRAY_SIZE(isc->isc_clks); i++)
> - isc->isc_clks[i].clk = ERR_PTR(-EINVAL);
> -
> - for (i = 0; i < ARRAY_SIZE(isc->isc_clks); i++) {
> - ret = isc_clk_register(isc, i);
> - if (ret)
> - return ret;
> - }
> -
> - return 0;
> -}
> -EXPORT_SYMBOL_GPL(isc_clk_init);
> -
> -void isc_clk_cleanup(struct isc_device *isc)
> -{
> - unsigned int i;
> -
> - of_clk_del_provider(isc->dev->of_node);
> -
> - for (i = 0; i < ARRAY_SIZE(isc->isc_clks); i++) {
> - struct isc_clk *isc_clk = &isc->isc_clks[i];
> -
> - if (!IS_ERR(isc_clk->clk))
> - clk_unregister(isc_clk->clk);
> - }
> -}
> -EXPORT_SYMBOL_GPL(isc_clk_cleanup);
>
> static int isc_queue_setup(struct vb2_queue *vq,
> unsigned int *nbuffers, unsigned int *nplanes,
> diff --git a/drivers/media/platform/atmel/atmel-isc-clk.c b/drivers/media/platform/atmel/atmel-isc-clk.c
> new file mode 100644
> index 000000000000..d650caade396
> --- /dev/null
> +++ b/drivers/media/platform/atmel/atmel-isc-clk.c
> @@ -0,0 +1,316 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Microchip Image Sensor Controller (ISC) common clock driver setup
> + *
> + * Copyright (C) 2016-2019 Microchip Technology, Inc.

Time flies!

> + *
> + * Author: Songjun Wu
> + * Author: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
> + *
> + */
> +#include <linux/clk.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk-provider.h>
> +#include <linux/platform_device.h>

Is this needed ?

> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/videobuf2-dma-contig.h>

Is any one of these needed ?

Removing them highlights how these includes should probably be
moved to atmel-isc.h which fails to compile if not preceeded by these
inclusions.

I think you can merge this with the previous patch that adds the file
entry to MAINTAINERS

Thanks
j

> +
> +#include "atmel-isc-regs.h"
> +#include "atmel-isc.h"
> +
> +static int isc_wait_clk_stable(struct clk_hw *hw)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> + struct regmap *regmap = isc_clk->regmap;
> + unsigned long timeout = jiffies + usecs_to_jiffies(1000);
> + unsigned int status;
> +
> + while (time_before(jiffies, timeout)) {
> + regmap_read(regmap, ISC_CLKSR, &status);
> + if (!(status & ISC_CLKSR_SIP))
> + return 0;
> +
> + usleep_range(10, 250);
> + }
> +
> + return -ETIMEDOUT;
> +}
> +
> +static int isc_clk_prepare(struct clk_hw *hw)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> + int ret;
> +
> + ret = pm_runtime_resume_and_get(isc_clk->dev);
> + if (ret < 0)
> + return ret;
> +
> + return isc_wait_clk_stable(hw);
> +}
> +
> +static void isc_clk_unprepare(struct clk_hw *hw)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> +
> + isc_wait_clk_stable(hw);
> +
> + pm_runtime_put_sync(isc_clk->dev);
> +}
> +
> +static int isc_clk_enable(struct clk_hw *hw)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> + u32 id = isc_clk->id;
> + struct regmap *regmap = isc_clk->regmap;
> + unsigned long flags;
> + unsigned int status;
> +
> + dev_dbg(isc_clk->dev, "ISC CLK: %s, id = %d, div = %d, parent id = %d\n",
> + __func__, id, isc_clk->div, isc_clk->parent_id);
> +
> + spin_lock_irqsave(&isc_clk->lock, flags);
> + regmap_update_bits(regmap, ISC_CLKCFG,
> + ISC_CLKCFG_DIV_MASK(id) | ISC_CLKCFG_SEL_MASK(id),
> + (isc_clk->div << ISC_CLKCFG_DIV_SHIFT(id)) |
> + (isc_clk->parent_id << ISC_CLKCFG_SEL_SHIFT(id)));
> +
> + regmap_write(regmap, ISC_CLKEN, ISC_CLK(id));
> + spin_unlock_irqrestore(&isc_clk->lock, flags);
> +
> + regmap_read(regmap, ISC_CLKSR, &status);
> + if (status & ISC_CLK(id))
> + return 0;
> + else
> + return -EINVAL;
> +}
> +
> +static void isc_clk_disable(struct clk_hw *hw)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> + u32 id = isc_clk->id;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&isc_clk->lock, flags);
> + regmap_write(isc_clk->regmap, ISC_CLKDIS, ISC_CLK(id));
> + spin_unlock_irqrestore(&isc_clk->lock, flags);
> +}
> +
> +static int isc_clk_is_enabled(struct clk_hw *hw)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> + u32 status;
> + int ret;
> +
> + ret = pm_runtime_resume_and_get(isc_clk->dev);
> + if (ret < 0)
> + return 0;
> +
> + regmap_read(isc_clk->regmap, ISC_CLKSR, &status);
> +
> + pm_runtime_put_sync(isc_clk->dev);
> +
> + return status & ISC_CLK(isc_clk->id) ? 1 : 0;
> +}
> +
> +static unsigned long
> +isc_clk_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> +
> + return DIV_ROUND_CLOSEST(parent_rate, isc_clk->div + 1);
> +}
> +
> +static int isc_clk_determine_rate(struct clk_hw *hw,
> + struct clk_rate_request *req)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> + long best_rate = -EINVAL;
> + int best_diff = -1;
> + unsigned int i, div;
> +
> + for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
> + struct clk_hw *parent;
> + unsigned long parent_rate;
> +
> + parent = clk_hw_get_parent_by_index(hw, i);
> + if (!parent)
> + continue;
> +
> + parent_rate = clk_hw_get_rate(parent);
> + if (!parent_rate)
> + continue;
> +
> + for (div = 1; div < ISC_CLK_MAX_DIV + 2; div++) {
> + unsigned long rate;
> + int diff;
> +
> + rate = DIV_ROUND_CLOSEST(parent_rate, div);
> + diff = abs(req->rate - rate);
> +
> + if (best_diff < 0 || best_diff > diff) {
> + best_rate = rate;
> + best_diff = diff;
> + req->best_parent_rate = parent_rate;
> + req->best_parent_hw = parent;
> + }
> +
> + if (!best_diff || rate < req->rate)
> + break;
> + }
> +
> + if (!best_diff)
> + break;
> + }
> +
> + dev_dbg(isc_clk->dev,
> + "ISC CLK: %s, best_rate = %ld, parent clk: %s @ %ld\n",
> + __func__, best_rate,
> + __clk_get_name((req->best_parent_hw)->clk),
> + req->best_parent_rate);
> +
> + if (best_rate < 0)
> + return best_rate;
> +
> + req->rate = best_rate;
> +
> + return 0;
> +}
> +
> +static int isc_clk_set_parent(struct clk_hw *hw, u8 index)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> +
> + if (index >= clk_hw_get_num_parents(hw))
> + return -EINVAL;
> +
> + isc_clk->parent_id = index;
> +
> + return 0;
> +}
> +
> +static u8 isc_clk_get_parent(struct clk_hw *hw)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> +
> + return isc_clk->parent_id;
> +}
> +
> +static int isc_clk_set_rate(struct clk_hw *hw,
> + unsigned long rate,
> + unsigned long parent_rate)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> + u32 div;
> +
> + if (!rate)
> + return -EINVAL;
> +
> + div = DIV_ROUND_CLOSEST(parent_rate, rate);
> + if (div > (ISC_CLK_MAX_DIV + 1) || !div)
> + return -EINVAL;
> +
> + isc_clk->div = div - 1;
> +
> + return 0;
> +}
> +
> +static const struct clk_ops isc_clk_ops = {
> + .prepare = isc_clk_prepare,
> + .unprepare = isc_clk_unprepare,
> + .enable = isc_clk_enable,
> + .disable = isc_clk_disable,
> + .is_enabled = isc_clk_is_enabled,
> + .recalc_rate = isc_clk_recalc_rate,
> + .determine_rate = isc_clk_determine_rate,
> + .set_parent = isc_clk_set_parent,
> + .get_parent = isc_clk_get_parent,
> + .set_rate = isc_clk_set_rate,
> +};
> +
> +static int isc_clk_register(struct isc_device *isc, unsigned int id)
> +{
> + struct regmap *regmap = isc->regmap;
> + struct device_node *np = isc->dev->of_node;
> + struct isc_clk *isc_clk;
> + struct clk_init_data init;
> + const char *clk_name = np->name;
> + const char *parent_names[3];
> + int num_parents;
> +
> + if (id == ISC_ISPCK && !isc->ispck_required)
> + return 0;
> +
> + num_parents = of_clk_get_parent_count(np);
> + if (num_parents < 1 || num_parents > 3)
> + return -EINVAL;
> +
> + if (num_parents > 2 && id == ISC_ISPCK)
> + num_parents = 2;
> +
> + of_clk_parent_fill(np, parent_names, num_parents);
> +
> + if (id == ISC_MCK)
> + of_property_read_string(np, "clock-output-names", &clk_name);
> + else
> + clk_name = "isc-ispck";
> +
> + init.parent_names = parent_names;
> + init.num_parents = num_parents;
> + init.name = clk_name;
> + init.ops = &isc_clk_ops;
> + init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
> +
> + isc_clk = &isc->isc_clks[id];
> + isc_clk->hw.init = &init;
> + isc_clk->regmap = regmap;
> + isc_clk->id = id;
> + isc_clk->dev = isc->dev;
> + spin_lock_init(&isc_clk->lock);
> +
> + isc_clk->clk = clk_register(isc->dev, &isc_clk->hw);
> + if (IS_ERR(isc_clk->clk)) {
> + dev_err(isc->dev, "%s: clock register fail\n", clk_name);
> + return PTR_ERR(isc_clk->clk);
> + } else if (id == ISC_MCK) {
> + of_clk_add_provider(np, of_clk_src_simple_get, isc_clk->clk);
> + }
> +
> + return 0;
> +}
> +
> +int isc_clk_init(struct isc_device *isc)
> +{
> + unsigned int i;
> + int ret;
> +
> + for (i = 0; i < ARRAY_SIZE(isc->isc_clks); i++)
> + isc->isc_clks[i].clk = ERR_PTR(-EINVAL);
> +
> + for (i = 0; i < ARRAY_SIZE(isc->isc_clks); i++) {
> + ret = isc_clk_register(isc, i);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(isc_clk_init);
> +
> +void isc_clk_cleanup(struct isc_device *isc)
> +{
> + unsigned int i;
> +
> + of_clk_del_provider(isc->dev->of_node);
> +
> + for (i = 0; i < ARRAY_SIZE(isc->isc_clks); i++) {
> + struct isc_clk *isc_clk = &isc->isc_clks[i];
> +
> + if (!IS_ERR(isc_clk->clk))
> + clk_unregister(isc_clk->clk);
> + }
> +}
> +EXPORT_SYMBOL_GPL(isc_clk_cleanup);
> --
> 2.25.1
>

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