Re: [RFC PATCH v6 6/9] accel/rocket: select the per-core clock and reset counts from match data

["Diederik de Haas" <diederik@cknow-tech.com>]

Hi Jiaxing,

On Thu Aug 6, 2026 at 8:34 AM CEST, Jiaxing Hu wrote:
> The RK3576 carries the same RKNN block with a different set of clocks and

nit: same RKNN block as what? And if it has a different set of clocks/resets,
is it still the same (HW) block?

> resets, so the counts cannot stay compile-time constants. Add a soc_data
> struct to the of_device_id match data and take the bulk counts from it.
> RK3588 keeps four clocks and two resets, so nothing changes for it.
>
> rocket_core_reset() is switched over as well. It is the same array, and
> leaving it on ARRAY_SIZE() would walk entries that were never acquired
> once a SoC asks for fewer.

but now comes the point I actually want to make:

> While moving through this path, take the two register writes in
> rocket_job_handle_irq() under job_lock. rocket_job_hw_submit() writes
> OPERATION_ENABLE from inside the lock, so a completion handled outside it
> can write the zero after that one and stop a task that has just started.

This should be its own separate commit (with a Fixes tag) ... which
probably doesn't have/should be part of this (RFC) series?

>
> Signed-off-by: Jiaxing Hu <gahing@gahingwoo.com>
> ---
>  drivers/accel/rocket/rocket_core.c |  8 ++++----
>  drivers/accel/rocket/rocket_core.h |  9 ++++++++-
>  drivers/accel/rocket/rocket_drv.c  | 12 +++++++++---
>  drivers/accel/rocket/rocket_job.c  | 12 +++++++++---
>  4 files changed, 30 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/accel/rocket/rocket_core.c b/drivers/accel/rocket/rocket_core.c
> index 5dd260bac..b202d1581 100644
> --- a/drivers/accel/rocket/rocket_core.c
> +++ b/drivers/accel/rocket/rocket_core.c
> @@ -23,7 +23,7 @@ int rocket_core_init(struct rocket_core *core)
>  
>  	core->resets[0].id = "srst_a";
>  	core->resets[1].id = "srst_h";
> -	err = devm_reset_control_bulk_get_exclusive(&pdev->dev, ARRAY_SIZE(core->resets),
> +	err = devm_reset_control_bulk_get_exclusive(&pdev->dev, core->soc->num_resets,
>  						    core->resets);
>  	if (err)
>  		return dev_err_probe(dev, err, "failed to get resets for core %d\n", core->index);
> @@ -32,7 +32,7 @@ int rocket_core_init(struct rocket_core *core)
>  	core->clks[1].id = "hclk";
>  	core->clks[2].id = "npu";
>  	core->clks[3].id = "pclk";
> -	err = devm_clk_bulk_get(dev, ARRAY_SIZE(core->clks), core->clks);
> +	err = devm_clk_bulk_get(dev, core->soc->num_clks, core->clks);
>  	if (err)
>  		return dev_err_probe(dev, err, "failed to get clocks for core %d\n", core->index);
>  
> @@ -109,9 +109,9 @@ void rocket_core_fini(struct rocket_core *core)
>  
>  void rocket_core_reset(struct rocket_core *core)
>  {
> -	reset_control_bulk_assert(ARRAY_SIZE(core->resets), core->resets);
> +	reset_control_bulk_assert(core->soc->num_resets, core->resets);
>  
>  	udelay(10);
>  
> -	reset_control_bulk_deassert(ARRAY_SIZE(core->resets), core->resets);
> +	reset_control_bulk_deassert(core->soc->num_resets, core->resets);
>  }
> diff --git a/drivers/accel/rocket/rocket_core.h b/drivers/accel/rocket/rocket_core.h
> index f6d738285..0f424bb86 100644
> --- a/drivers/accel/rocket/rocket_core.h
> +++ b/drivers/accel/rocket/rocket_core.h
> @@ -27,16 +27,23 @@
>  #define rocket_core_writel(core, reg, value) \
>  	writel(value, (core)->core_iomem + (REG_CORE_##reg) - REG_CORE_S_STATUS)
>  
> +/* Per-SoC differences, selected by the of_device_id match data. */
> +struct rocket_soc_data {
> +	unsigned int num_clks;		/* clk_bulk count */
> +	unsigned int num_resets;	/* reset_bulk count */
> +};
> +
>  struct rocket_core {
>  	struct device *dev;
>  	struct rocket_device *rdev;
> +	const struct rocket_soc_data *soc;
>  	unsigned int index;
>  
>  	int irq;
>  	void __iomem *pc_iomem;
>  	void __iomem *cna_iomem;
>  	void __iomem *core_iomem;
> -	struct clk_bulk_data clks[4];
> +	struct clk_bulk_data clks[6];
>  	struct reset_control_bulk_data resets[2];
>  
>  	struct iommu_group *iommu_group;
> diff --git a/drivers/accel/rocket/rocket_drv.c b/drivers/accel/rocket/rocket_drv.c
> index 8bbbce594..6e7dc91c5 100644
> --- a/drivers/accel/rocket/rocket_drv.c
> +++ b/drivers/accel/rocket/rocket_drv.c
> @@ -176,6 +176,7 @@ static int rocket_probe(struct platform_device *pdev)
>  
>  	rdev->cores[core].rdev = rdev;
>  	rdev->cores[core].dev = &pdev->dev;
> +	rdev->cores[core].soc = of_device_get_match_data(&pdev->dev);
>  	rdev->cores[core].index = core;
>  
>  	rdev->num_cores++;
> @@ -213,8 +214,13 @@ static void rocket_remove(struct platform_device *pdev)
>  	}
>  }
>  
> +static const struct rocket_soc_data rk3588_soc_data = {
> +	.num_clks = 4,
> +	.num_resets = 2,
> +};
> +
>  static const struct of_device_id dt_match[] = {
> -	{ .compatible = "rockchip,rk3588-rknn-core" },
> +	{ .compatible = "rockchip,rk3588-rknn-core", .data = &rk3588_soc_data },

While it technically fits on 1 line, putting the ``.data = `` part on its
own line is easier to read and likely more future proof. 

Cheers,
  Diederik

>  	{}
>  };
>  MODULE_DEVICE_TABLE(of, dt_match);
> @@ -240,7 +246,7 @@ static int rocket_device_runtime_resume(struct device *dev)
>  	if (core < 0)
>  		return -ENODEV;
>  
> -	err = clk_bulk_prepare_enable(ARRAY_SIZE(rdev->cores[core].clks), rdev->cores[core].clks);
> +	err = clk_bulk_prepare_enable(rdev->cores[core].soc->num_clks, rdev->cores[core].clks);
>  	if (err) {
>  		dev_err(dev, "failed to enable (%d) clocks for core %d\n", err, core);
>  		return err;
> @@ -260,7 +266,7 @@ static int rocket_device_runtime_suspend(struct device *dev)
>  	if (!rocket_job_is_idle(&rdev->cores[core]))
>  		return -EBUSY;
>  
> -	clk_bulk_disable_unprepare(ARRAY_SIZE(rdev->cores[core].clks), rdev->cores[core].clks);
> +	clk_bulk_disable_unprepare(rdev->cores[core].soc->num_clks, rdev->cores[core].clks);
>  
>  	return 0;
>  }
> diff --git a/drivers/accel/rocket/rocket_job.c b/drivers/accel/rocket/rocket_job.c
> index bb77b6bf0..aa26e2977 100644
> --- a/drivers/accel/rocket/rocket_job.c
> +++ b/drivers/accel/rocket/rocket_job.c
> @@ -345,10 +345,15 @@ static void rocket_job_handle_irq(struct rocket_core *core)
>  {
>  	pm_runtime_mark_last_busy(core->dev);
>  
> -	rocket_pc_writel(core, OPERATION_ENABLE, 0x0);
> -	rocket_pc_writel(core, INTERRUPT_CLEAR, 0x1ffff);
> +	scoped_guard(mutex, &core->job_lock) {
> +		/*
> +		 * Stopping the block belongs under the lock. hw_submit() writes
> +		 * OPERATION_ENABLE too, and outside the lock this zero can land
> +		 * after that one and kill a task that has only just started.
> +		 */
> +		rocket_pc_writel(core, OPERATION_ENABLE, 0x0);
> +		rocket_pc_writel(core, INTERRUPT_CLEAR, 0x1ffff);
>  
> -	scoped_guard(mutex, &core->job_lock)
>  		if (core->in_flight_job) {
>  			if (core->in_flight_job->next_task_idx < core->in_flight_job->task_count) {
>  				rocket_job_hw_submit(core, core->in_flight_job);
> @@ -360,6 +365,7 @@ static void rocket_job_handle_irq(struct rocket_core *core)
>  			pm_runtime_put_autosuspend(core->dev);
>  			core->in_flight_job = NULL;
>  		}
> +	}
>  }
>  
>  static void