media: platform: amd: isp4 debug fs logging and more descriptive errors

Add debug fs for isp4 driver and add more detailed descriptive error info
to some of the log message

Co-developed-by: Sultan Alsawaf <sultan@kerneltoast.com>
Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
Co-developed-by: Svetoslav Stoilov <Svetoslav.Stoilov@amd.com>
Signed-off-by: Svetoslav Stoilov <Svetoslav.Stoilov@amd.com>
Signed-off-by: Bin Du <Bin.Du@amd.com>
Reviewed-by: Sultan Alsawaf <sultan@kerneltoast.com>
Tested-by: Alexey Zagorodnikov <xglooom@gmail.com>
Tested-by: Kate Hsuan <hpa@redhat.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>

MAINTAINERS

@@ -1164,6 +1164,8 @@ F:	drivers/media/platform/amd/isp4/Kconfig
 F:	drivers/media/platform/amd/isp4/Makefile
 F:	drivers/media/platform/amd/isp4/isp4.c
 F:	drivers/media/platform/amd/isp4/isp4.h
+F:	drivers/media/platform/amd/isp4/isp4_debug.c
+F:	drivers/media/platform/amd/isp4/isp4_debug.h
 F:	drivers/media/platform/amd/isp4/isp4_fw_cmd_resp.h
 F:	drivers/media/platform/amd/isp4/isp4_hw_reg.h
 F:	drivers/media/platform/amd/isp4/isp4_interface.c

drivers/media/platform/amd/isp4/Makefile

@@ -4,6 +4,7 @@
 
 obj-$(CONFIG_VIDEO_AMD_ISP4_CAPTURE) += amd_isp4_capture.o
 amd_isp4_capture-objs := isp4.o \
+                         isp4_debug.o \
                          isp4_interface.o \
                          isp4_subdev.o \
-                         isp4_video.o
+                         isp4_video.o

drivers/media/platform/amd/isp4/isp4.c

@@ -9,6 +9,7 @@
 #include <media/v4l2-ioctl.h>
 
 #include "isp4.h"
+#include "isp4_debug.h"
 #include "isp4_hw_reg.h"
 
 #define ISP4_DRV_NAME "amd_isp_capture"
@@ -191,6 +192,7 @@ static int isp4_capture_probe(struct platform_device *pdev)
 	}
 
 	platform_set_drvdata(pdev, isp_dev);
+	isp_debugfs_create(isp_dev);
 
 	return 0;
 
@@ -210,6 +212,8 @@ static void isp4_capture_remove(struct platform_device *pdev)
 	struct isp4_device *isp_dev = platform_get_drvdata(pdev);
 	struct device *dev = &pdev->dev;
 
+	isp_debugfs_remove(isp_dev);
+
 	media_device_unregister(&isp_dev->mdev);
 	isp4sd_deinit(&isp_dev->isp_subdev);
 	pm_runtime_disable(dev);

drivers/media/platform/amd/isp4/isp4_debug.c

@@ -0,0 +1,271 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2025 Advanced Micro Devices, Inc.
+ */
+
+#include "isp4.h"
+#include "isp4_debug.h"
+#include "isp4_hw_reg.h"
+#include "isp4_interface.h"
+
+#define ISP4DBG_FW_LOG_RINGBUF_SIZE (2 * 1024 * 1024)
+#define ISP4DBG_MACRO_2_STR(X) #X
+#define ISP4DBG_ONE_TIME_LOG_LEN 510
+
+#ifdef CONFIG_DEBUG_FS
+
+void isp_debugfs_create(struct isp4_device *isp_dev)
+{
+	isp_dev->isp_subdev.debugfs_dir = debugfs_create_dir("amd_isp4", NULL);
+	debugfs_create_bool("fw_log_enable", 0644,
+			    isp_dev->isp_subdev.debugfs_dir,
+			    &isp_dev->isp_subdev.enable_fw_log);
+	isp_dev->isp_subdev.fw_log_output =
+		devm_kzalloc(isp_dev->isp_subdev.dev,
+			     ISP4DBG_FW_LOG_RINGBUF_SIZE + 32,
+			     GFP_KERNEL);
+}
+
+void isp_debugfs_remove(struct isp4_device *isp_dev)
+{
+	debugfs_remove_recursive(isp_dev->isp_subdev.debugfs_dir);
+	isp_dev->isp_subdev.debugfs_dir = NULL;
+}
+
+static u32 isp_fw_fill_rb_log(struct isp4_subdev *isp, void *sys, u32 rb_size)
+{
+	struct isp4_interface *ispif = &isp->ispif;
+	char *buf = isp->fw_log_output;
+	struct device *dev = isp->dev;
+	u32 rd_ptr, wr_ptr;
+	u32 total_cnt = 0;
+	u32 offset = 0;
+	u32 cnt;
+
+	if (!sys || !rb_size)
+		return 0;
+
+	guard(mutex)(&ispif->isp4if_mutex);
+
+	rd_ptr = isp4hw_rreg(isp->mmio, ISP_LOG_RB_RPTR0);
+	wr_ptr = isp4hw_rreg(isp->mmio, ISP_LOG_RB_WPTR0);
+
+	do {
+		if (wr_ptr > rd_ptr)
+			cnt = wr_ptr - rd_ptr;
+		else if (wr_ptr < rd_ptr)
+			cnt = rb_size - rd_ptr;
+		else
+			goto quit;
+
+		if (cnt > rb_size) {
+			dev_err(dev, "fail bad fw log size %u\n", cnt);
+			goto quit;
+		}
+
+		memcpy(buf + offset, sys + rd_ptr, cnt);
+
+		offset += cnt;
+		total_cnt += cnt;
+		rd_ptr = (rd_ptr + cnt) % rb_size;
+	} while (rd_ptr < wr_ptr);
+
+	isp4hw_wreg(isp->mmio, ISP_LOG_RB_RPTR0, rd_ptr);
+
+quit:
+	return total_cnt;
+}
+
+void isp_fw_log_print(struct isp4_subdev *isp)
+{
+	struct isp4_interface *ispif = &isp->ispif;
+	char *fw_log_buf = isp->fw_log_output;
+	u32 cnt;
+
+	if (!isp->enable_fw_log || !fw_log_buf)
+		return;
+
+	cnt = isp_fw_fill_rb_log(isp, ispif->fw_log_buf->sys_addr,
+				 ispif->fw_log_buf->mem_size);
+
+	if (cnt) {
+		char temp_ch;
+		char *str;
+		char *end;
+		/* line end */
+		char *le;
+
+		str = (char *)fw_log_buf;
+		end = ((char *)fw_log_buf + cnt);
+		fw_log_buf[cnt] = 0;
+
+		while (str < end) {
+			le = strchr(str, 0x0A);
+			if ((le && str + ISP4DBG_ONE_TIME_LOG_LEN >= le) ||
+			    (!le && str + ISP4DBG_ONE_TIME_LOG_LEN >= end)) {
+				if (le)
+					*le = 0;
+
+				if (*str != '\0')
+					dev_dbg(isp->dev, "%s", str);
+
+				if (le) {
+					*le = 0x0A;
+					str = le + 1;
+				} else {
+					break;
+				}
+			} else {
+				u32 tmp_len = ISP4DBG_ONE_TIME_LOG_LEN;
+
+				temp_ch = str[tmp_len];
+				str[tmp_len] = 0;
+				dev_dbg(isp->dev, "%s", str);
+				str[tmp_len] = temp_ch;
+				str = &str[tmp_len];
+			}
+		}
+	}
+}
+#endif
+
+char *isp4dbg_get_buf_src_str(u32 src)
+{
+	switch (src) {
+	case ISP4FW_BUFFER_SOURCE_STREAM:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_BUFFER_SOURCE_STREAM);
+	default:
+		return "Unknown buf source";
+	}
+}
+
+char *isp4dbg_get_buf_done_str(u32 status)
+{
+	switch (status) {
+	case ISP4FW_BUFFER_STATUS_INVALID:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_BUFFER_STATUS_INVALID);
+	case ISP4FW_BUFFER_STATUS_SKIPPED:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_BUFFER_STATUS_SKIPPED);
+	case ISP4FW_BUFFER_STATUS_EXIST:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_BUFFER_STATUS_EXIST);
+	case ISP4FW_BUFFER_STATUS_DONE:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_BUFFER_STATUS_DONE);
+	case ISP4FW_BUFFER_STATUS_LACK:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_BUFFER_STATUS_LACK);
+	case ISP4FW_BUFFER_STATUS_DIRTY:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_BUFFER_STATUS_DIRTY);
+	case ISP4FW_BUFFER_STATUS_MAX:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_BUFFER_STATUS_MAX);
+	default:
+		return "Unknown Buf Done Status";
+	}
+}
+
+char *isp4dbg_get_img_fmt_str(int fmt /* enum isp4fw_image_format * */)
+{
+	switch (fmt) {
+	case ISP4FW_IMAGE_FORMAT_NV12:
+		return "NV12";
+	case ISP4FW_IMAGE_FORMAT_YUV422INTERLEAVED:
+		return "YUV422INTERLEAVED";
+	default:
+		return "unknown fmt";
+	}
+}
+
+void isp4dbg_show_bufmeta_info(struct device *dev, char *pre,
+			       void *in, void *orig_buf)
+{
+	struct isp4fw_buffer_meta_info *p;
+	struct isp4if_img_buf_info *orig;
+
+	if (!in)
+		return;
+
+	if (!pre)
+		pre = "";
+
+	p = in;
+	orig = orig_buf;
+
+	dev_dbg(dev, "%s(%s) en:%d,stat:%s(%u),src:%s\n", pre,
+		isp4dbg_get_img_fmt_str(p->image_prop.image_format),
+		p->enabled, isp4dbg_get_buf_done_str(p->status), p->status,
+		isp4dbg_get_buf_src_str(p->source));
+
+	dev_dbg(dev, "%p,0x%llx(%u) %p,0x%llx(%u) %p,0x%llx(%u)\n",
+		orig->planes[0].sys_addr, orig->planes[0].mc_addr,
+		orig->planes[0].len, orig->planes[1].sys_addr,
+		orig->planes[1].mc_addr, orig->planes[1].len,
+		orig->planes[2].sys_addr, orig->planes[2].mc_addr,
+		orig->planes[2].len);
+}
+
+char *isp4dbg_get_buf_type(u32 type)
+{
+	/* enum isp4fw_buffer_type */
+	switch (type) {
+	case ISP4FW_BUFFER_TYPE_PREVIEW:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_BUFFER_TYPE_PREVIEW);
+	case ISP4FW_BUFFER_TYPE_META_INFO:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_BUFFER_TYPE_META_INFO);
+	case ISP4FW_BUFFER_TYPE_MEM_POOL:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_BUFFER_TYPE_MEM_POOL);
+	default:
+		return "unknown type";
+	}
+}
+
+char *isp4dbg_get_cmd_str(u32 cmd)
+{
+	switch (cmd) {
+	case ISP4FW_CMD_ID_START_STREAM:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_CMD_ID_START_STREAM);
+	case ISP4FW_CMD_ID_STOP_STREAM:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_CMD_ID_STOP_STREAM);
+	case ISP4FW_CMD_ID_SEND_BUFFER:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_CMD_ID_SEND_BUFFER);
+	case ISP4FW_CMD_ID_SET_STREAM_CONFIG:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_CMD_ID_SET_STREAM_CONFIG);
+	case ISP4FW_CMD_ID_SET_OUT_CHAN_PROP:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_CMD_ID_SET_OUT_CHAN_PROP);
+	case ISP4FW_CMD_ID_ENABLE_OUT_CHAN:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_CMD_ID_ENABLE_OUT_CHAN);
+	default:
+		return "unknown cmd";
+	}
+}
+
+char *isp4dbg_get_resp_str(u32 cmd)
+{
+	switch (cmd) {
+	case ISP4FW_RESP_ID_CMD_DONE:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_RESP_ID_CMD_DONE);
+	case ISP4FW_RESP_ID_NOTI_FRAME_DONE:
+		return ISP4DBG_MACRO_2_STR(ISP4FW_RESP_ID_NOTI_FRAME_DONE);
+	default:
+		return "unknown respid";
+	}
+}
+
+char *isp4dbg_get_if_stream_str(u32 stream /* enum fw_cmd_resp_stream_id */)
+{
+	switch (stream) {
+	case ISP4IF_STREAM_ID_GLOBAL:
+		return "STREAM_GLOBAL";
+	case ISP4IF_STREAM_ID_1:
+		return "STREAM1";
+	default:
+		return "unknown streamID";
+	}
+}
+
+char *isp4dbg_get_out_ch_str(int ch /* enum isp4fw_pipe_out_ch */)
+{
+	switch ((enum isp4fw_pipe_out_ch)ch) {
+	case ISP4FW_ISP_PIPE_OUT_CH_PREVIEW:
+		return "prev";
+	default:
+		return "unknown channel";
+	}
+}

drivers/media/platform/amd/isp4/isp4_debug.h

@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2025 Advanced Micro Devices, Inc.
+ */
+
+#ifndef _ISP4_DEBUG_H_
+#define _ISP4_DEBUG_H_
+
+#include <linux/dev_printk.h>
+#include <linux/printk.h>
+
+#include "isp4_subdev.h"
+
+#ifdef CONFIG_DEBUG_FS
+struct isp4_device;
+
+void isp_debugfs_create(struct isp4_device *isp_dev);
+void isp_debugfs_remove(struct isp4_device *isp_dev);
+void isp_fw_log_print(struct isp4_subdev *isp);
+
+#else
+
+/* to avoid checkpatch warning */
+#define isp_debugfs_create(cam) ((void)(cam))
+#define isp_debugfs_remove(cam) ((void)(cam))
+#define isp_fw_log_print(isp) ((void)(isp))
+
+#endif /* CONFIG_DEBUG_FS */
+
+void isp4dbg_show_bufmeta_info(struct device *dev, char *pre, void *p,
+			       void *orig_buf /* struct sys_img_buf_handle */);
+char *isp4dbg_get_img_fmt_str(int fmt /* enum _image_format_t */);
+char *isp4dbg_get_out_ch_str(int ch /* enum _isp_pipe_out_ch_t */);
+char *isp4dbg_get_cmd_str(u32 cmd);
+char *isp4dbg_get_buf_type(u32 type);/* enum _buffer_type_t */
+char *isp4dbg_get_resp_str(u32 resp);
+char *isp4dbg_get_buf_src_str(u32 src);
+char *isp4dbg_get_buf_done_str(u32 status);
+char *isp4dbg_get_if_stream_str(u32 stream);
+
+#endif /* _ISP4_DEBUG_H_ */

drivers/media/platform/amd/isp4/isp4_interface.c

@@ -5,6 +5,7 @@
 
 #include <linux/iopoll.h>
 
+#include "isp4_debug.h"
 #include "isp4_fw_cmd_resp.h"
 #include "isp4_hw_reg.h"
 #include "isp4_interface.h"
@@ -302,8 +303,9 @@ static int isp4if_insert_isp_fw_cmd(struct isp4_interface *ispif,
 	wr_ptr = isp4hw_rreg(ispif->mmio, wreg);
 	if (rd_ptr >= len || wr_ptr >= len) {
 		dev_err(dev,
-			"rb invalid: stream=%u, rd=%u, wr=%u, len=%u, cmd_sz=%u\n",
-			stream, rd_ptr, wr_ptr, len, cmd_sz);
+			"rb invalid: stream=%u(%s), rd=%u, wr=%u, len=%u, cmd_sz=%u\n",
+			stream, isp4dbg_get_if_stream_str(stream), rd_ptr,
+			wr_ptr, len, cmd_sz);
 		return -EINVAL;
 	}
 
@@ -394,8 +396,9 @@ static int isp4if_send_fw_cmd(struct isp4_interface *ispif, u32 cmd_id,
 						 rb_config->reg_wptr);
 
 			dev_err(dev,
-				"fail to get free cmdq slot, stream (%d),rd %u, wr %u\n",
-				stream, rd_ptr, wr_ptr);
+				"failed to get free cmdq slot, stream %s(%d),rd %u, wr %u\n",
+				isp4dbg_get_if_stream_str(stream), stream,
+				rd_ptr, wr_ptr);
 			ret = -ETIMEDOUT;
 			goto free_ele;
 		}
@@ -421,8 +424,8 @@ static int isp4if_send_fw_cmd(struct isp4_interface *ispif, u32 cmd_id,
 		ret = isp4if_insert_isp_fw_cmd(ispif, stream, &cmd);
 		if (ret) {
 			dev_err(dev,
-				"fail for insert_isp_fw_cmd cmd_id (0x%08x)\n",
-				cmd_id);
+				"fail for insert_isp_fw_cmd cmd_id %s(0x%08x)\n",
+				isp4dbg_get_cmd_str(cmd_id), cmd_id);
 			goto err_dequeue_ele;
 		}
 	}
@@ -692,8 +695,9 @@ int isp4if_f2h_resp(struct isp4_interface *ispif, enum isp4if_stream_id stream,
 	if (checksum != resp->resp_check_sum) {
 		dev_err(dev, "resp checksum 0x%x,should 0x%x,rptr %u,wptr %u\n",
 			checksum, resp->resp_check_sum, rd_ptr, wr_ptr);
-		dev_err(dev, "(%u), seqNo %u, resp_id (0x%x)\n",
-			stream, resp->resp_seq_num,
+		dev_err(dev, "%s(%u), seqNo %u, resp_id %s(0x%x)\n",
+			isp4dbg_get_if_stream_str(stream), stream,
+			resp->resp_seq_num, isp4dbg_get_resp_str(resp->resp_id),
 			resp->resp_id);
 		return -EINVAL;
 	}
@@ -702,8 +706,9 @@ int isp4if_f2h_resp(struct isp4_interface *ispif, enum isp4if_stream_id stream,
 
 err_rb_invalid:
 	dev_err(dev,
-		"rb invalid: stream=%u, rd=%u, wr=%u, len=%u, resp_sz=%u\n",
-		stream, rd_ptr, wr_ptr, len, resp_sz);
+		"rb invalid: stream=%u(%s), rd=%u, wr=%u, len=%u, resp_sz=%u\n",
+		stream, isp4dbg_get_if_stream_str(stream), rd_ptr, wr_ptr, len,
+		resp_sz);
 	return -EINVAL;
 }
 

drivers/media/platform/amd/isp4/isp4_subdev.c

@@ -7,6 +7,7 @@
 #include <linux/units.h>
 
 #include "isp4.h"
+#include "isp4_debug.h"
 #include "isp4_fw_cmd_resp.h"
 #include "isp4_interface.h"
 
@@ -263,9 +264,9 @@ static int isp4sd_setup_output(struct isp4_subdev *isp_subdev,
 		return -EINVAL;
 	}
 
-	dev_dbg(dev, "channel:%d,fmt %d,w:h=%u:%u,lp:%u,cp%u\n",
-		cmd_ch_prop.ch,
-		cmd_ch_prop.image_prop.image_format,
+	dev_dbg(dev, "channel:%s,fmt %s,w:h=%u:%u,lp:%u,cp%u\n",
+		isp4dbg_get_out_ch_str(cmd_ch_prop.ch),
+		isp4dbg_get_img_fmt_str(cmd_ch_prop.image_prop.image_format),
 		cmd_ch_prop.image_prop.width, cmd_ch_prop.image_prop.height,
 		cmd_ch_prop.image_prop.luma_pitch,
 		cmd_ch_prop.image_prop.chroma_pitch);
@@ -294,7 +295,8 @@ static int isp4sd_setup_output(struct isp4_subdev *isp_subdev,
 		return ret;
 	}
 
-	dev_dbg(dev, "enable channel %d\n", cmd_ch_en.ch);
+	dev_dbg(dev, "enable channel %s\n",
+		isp4dbg_get_out_ch_str(cmd_ch_en.ch));
 
 	if (!sensor_info->start_stream_cmd_sent) {
 		ret = isp4sd_kickoff_stream(isp_subdev,
@@ -381,8 +383,9 @@ static void isp4sd_fw_resp_cmd_done(struct isp4_subdev *isp_subdev,
 		isp4if_rm_cmd_from_cmdq(ispif, para->cmd_seq_num, para->cmd_id);
 	struct device *dev = isp_subdev->dev;
 
-	dev_dbg(dev, "stream %d,cmd (0x%08x)(%d),seq %u, ele %p\n",
+	dev_dbg(dev, "stream %d,cmd %s(0x%08x)(%d),seq %u, ele %p\n",
 		stream_id,
+		isp4dbg_get_cmd_str(para->cmd_id),
 		para->cmd_id, para->cmd_status, para->cmd_seq_num,
 		ele);
 
@@ -458,8 +461,9 @@ static void isp4sd_fw_resp_frame_done(struct isp4_subdev *isp_subdev,
 		return;
 	}
 
-	dev_dbg(dev, "ts:%llu,streamId:%d,poc:%u,preview_en:%u,status:%i\n",
+	dev_dbg(dev, "ts:%llu,streamId:%d,poc:%u,preview_en:%u,status:%s(%i)\n",
 		ktime_get_ns(), stream_id, meta->poc, meta->preview.enabled,
+		isp4dbg_get_buf_done_str(meta->preview.status),
 		meta->preview.status);
 
 	if (meta->preview.enabled &&
@@ -468,6 +472,8 @@ static void isp4sd_fw_resp_frame_done(struct isp4_subdev *isp_subdev,
 	     meta->preview.status == ISP4FW_BUFFER_STATUS_DIRTY)) {
 		prev = isp4if_dequeue_buffer(ispif);
 		if (prev) {
+			isp4dbg_show_bufmeta_info(dev, "prev", &meta->preview,
+						  &prev->buf_info);
 			isp4vid_handle_frame_done(&isp_subdev->isp_vdev,
 						  &prev->buf_info);
 			isp4if_dealloc_buffer_node(prev);
@@ -475,8 +481,9 @@ static void isp4sd_fw_resp_frame_done(struct isp4_subdev *isp_subdev,
 			dev_err(dev, "fail null prev buf\n");
 		}
 	} else if (meta->preview.enabled) {
-		dev_err(dev, "fail bad preview status %u\n",
-			meta->preview.status);
+		dev_err(dev, "fail bad preview status %u(%s)\n",
+			meta->preview.status,
+			isp4dbg_get_buf_done_str(meta->preview.status));
 	}
 
 	if (isp_subdev->sensor_info.status == ISP4SD_START_STATUS_STARTED)
@@ -493,6 +500,9 @@ static void isp4sd_fw_resp_func(struct isp4_subdev *isp_subdev,
 	struct device *dev = isp_subdev->dev;
 	struct isp4fw_resp resp;
 
+	if (stream_id == ISP4IF_STREAM_ID_1)
+		isp_fw_log_print(isp_subdev);
+
 	while (true) {
 		if (isp4if_f2h_resp(ispif, stream_id, &resp)) {
 			/* Re-enable the interrupt */
@@ -522,7 +532,8 @@ static void isp4sd_fw_resp_func(struct isp4_subdev *isp_subdev,
 						  &resp.param.frame_done);
 			break;
 		default:
-			dev_err(dev, "-><- fail respid (0x%x)\n",
+			dev_err(dev, "-><- fail respid %s(0x%x)\n",
+				isp4dbg_get_resp_str(resp.resp_id),
 				resp.resp_id);
 			break;
 		}

drivers/media/platform/amd/isp4/isp4_subdev.h

@@ -109,6 +109,11 @@ struct isp4_subdev {
 	bool irq_enabled;
 	/* spin lock to access ISP_SYS_INT0_EN exclusively */
 	spinlock_t irq_lock;
+#ifdef CONFIG_DEBUG_FS
+	bool enable_fw_log;
+	struct dentry *debugfs_dir;
+	char *fw_log_output;
+#endif
 };
 
 int isp4sd_init(struct isp4_subdev *isp_subdev, struct v4l2_device *v4l2_dev,