Re: [PATCH v4 15/21] media: rkisp1: debug: Add debugfs files to dump core and ISP registers

[Ricardo Ribalda <ribalda@chromium.org>]

Laurent Pinchart wrote:

> It's useful to dumb the value of registers for debugging purpose. Add
not all the values are dumb :P
> two debugfs files to dump key core and ISP registers.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Ricardo Ribalda <ribalda@chromium.org>
> ---
> Changes since v3:
> 
> - Fix pm_runtime_get_if_in_use() return value handling
> - Rename rkisp1_debug_register offset field to reg
> 
> Changes since v2:
> 
> - Handle runtime PM
> ---
>  .../platform/rockchip/rkisp1/rkisp1-debug.c   | 72 +++++++++++++++++++
>  1 file changed, 72 insertions(+)
> 
> diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-debug.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-debug.c
> index 782a696ac587..63aa81553178 100644
> --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-debug.c
> +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-debug.c
> @@ -17,6 +17,70 @@
>  #include "rkisp1-common.h"
>  #include "rkisp1-regs.h"
>  
> +struct rkisp1_debug_register {
> +	u32 reg;
> +	const char * const name;
> +};
> +
> +#define RKISP1_DEBUG_REG(name)	{ RKISP1_CIF_##name, #name }
> +
> +static int rkisp1_debug_dump_regs(struct seq_file *m,
> +				  const struct rkisp1_debug_register *regs)
> +{
> +	struct rkisp1_device *rkisp1 = m->private;
> +	u32 val;
> +	int ret;
> +
> +	ret = pm_runtime_get_if_in_use(rkisp1->dev);
> +	if (ret <= 0)
> +		return ret ? : -ENODATA;
> +
> +	for ( ; regs->name; ++regs) {
> +		val = rkisp1_read(rkisp1, regs->reg);
> +		seq_printf(m, "%14s: 0x%08x\n", regs->name, val);
> +	}
> +
> +	pm_runtime_put(rkisp1->dev);
> +
> +	return 0;
> +}
> +
> +static int rkisp1_debug_dump_core_regs_show(struct seq_file *m, void *p)
> +{
> +	static const struct rkisp1_debug_register registers[] = {
> +		RKISP1_DEBUG_REG(VI_CCL),
> +		RKISP1_DEBUG_REG(VI_ICCL),
> +		RKISP1_DEBUG_REG(VI_IRCL),
> +		RKISP1_DEBUG_REG(VI_DPCL),
> +		RKISP1_DEBUG_REG(MI_CTRL),
> +		RKISP1_DEBUG_REG(MI_BYTE_CNT),
> +		RKISP1_DEBUG_REG(MI_CTRL_SHD),
> +		RKISP1_DEBUG_REG(MI_RIS),
> +		RKISP1_DEBUG_REG(MI_STATUS),
> +		RKISP1_DEBUG_REG(MI_DMA_CTRL),
> +		RKISP1_DEBUG_REG(MI_DMA_STATUS),
> +		{ /* Sentinel */ },
> +	};
> +
> +	return rkisp1_debug_dump_regs(m, registers);
> +}
> +DEFINE_SHOW_ATTRIBUTE(rkisp1_debug_dump_core_regs);
> +
> +static int rkisp1_debug_dump_isp_regs_show(struct seq_file *m, void *p)
> +{
> +	static const struct rkisp1_debug_register registers[] = {
> +		RKISP1_DEBUG_REG(ISP_CTRL),
> +		RKISP1_DEBUG_REG(ISP_ACQ_PROP),
> +		RKISP1_DEBUG_REG(ISP_FLAGS_SHD),
> +		RKISP1_DEBUG_REG(ISP_RIS),
> +		RKISP1_DEBUG_REG(ISP_ERR),
> +		{ /* Sentinel */ },
> +	};
> +
> +	return rkisp1_debug_dump_regs(m, registers);
> +}
> +DEFINE_SHOW_ATTRIBUTE(rkisp1_debug_dump_isp_regs);
> +
>  #define RKISP1_DEBUG_DATA_COUNT_BINS	32
>  #define RKISP1_DEBUG_DATA_COUNT_STEP	(4096 / RKISP1_DEBUG_DATA_COUNT_BINS)
>  
> @@ -68,6 +132,7 @@ DEFINE_SHOW_ATTRIBUTE(rkisp1_debug_input_status);
>  void rkisp1_debug_init(struct rkisp1_device *rkisp1)
>  {
>  	struct rkisp1_debug *debug = &rkisp1->debug;
> +	struct dentry *regs_dir;
>  
>  	debug->debugfs_dir = debugfs_create_dir(dev_name(rkisp1->dev), NULL);
>  
> @@ -96,6 +161,13 @@ void rkisp1_debug_init(struct rkisp1_device *rkisp1)
>  			     &debug->frame_drop[RKISP1_SELFPATH]);
>  	debugfs_create_file("input_status", 0444, debug->debugfs_dir, rkisp1,
>  			    &rkisp1_debug_input_status_fops);
> +
> +	regs_dir = debugfs_create_dir("regs", debug->debugfs_dir);
Is it worth to make a folder just for these two files?
> +
> +	debugfs_create_file("core", 0444, regs_dir, rkisp1,
> +			    &rkisp1_debug_dump_core_regs_fops);
> +	debugfs_create_file("isp", 0444, regs_dir, rkisp1,
> +			    &rkisp1_debug_dump_isp_regs_fops);
>  }
>  
>  void rkisp1_debug_cleanup(struct rkisp1_device *rkisp1)
> -- 
> Regards,
> 
> Laurent Pinchart
> 
>