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

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

It's useful to dumb the value of registers for debugging purpose. Add
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>
---
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);
+
+	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