[media] bdisp: add debug file system

Creates 5 debugfs entries to dump the last HW request, the last HW node
(=command), the HW registers and the recent HW performance (time & fps)
Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/sti/bdisp/Makefile

 obj-$(CONFIG_VIDEO_STI_BDISP) := bdisp.o
 
-bdisp-objs := bdisp-v4l2.o bdisp-hw.o
+bdisp-objs := bdisp-v4l2.o bdisp-hw.o bdisp-debug.o

drivers/media/platform/sti/bdisp/bdisp-debug.c

+/*
+ * Copyright (C) STMicroelectronics SA 2014
+ * Authors: Fabien Dessenne <fabien.dessenne@st.com> for STMicroelectronics.
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#include <linux/debugfs.h>
+#include <linux/pm_runtime.h>
+
+#include "bdisp.h"
+#include "bdisp-filter.h"
+#include "bdisp-reg.h"
+
+void bdisp_dbg_perf_begin(struct bdisp_dev *bdisp)
+{
+	bdisp->dbg.hw_start = ktime_get();
+}
+
+void bdisp_dbg_perf_end(struct bdisp_dev *bdisp)
+{
+	s64 time_us;
+
+	time_us = ktime_us_delta(ktime_get(), bdisp->dbg.hw_start);
+
+	if (!bdisp->dbg.min_duration)
+		bdisp->dbg.min_duration = time_us;
+	else
+		bdisp->dbg.min_duration = min(time_us, bdisp->dbg.min_duration);
+
+	bdisp->dbg.last_duration = time_us;
+	bdisp->dbg.max_duration = max(time_us, bdisp->dbg.max_duration);
+	bdisp->dbg.tot_duration += time_us;
+}
+
+static void bdisp_dbg_dump_ins(struct seq_file *s, u32 val)
+{
+	seq_printf(s, "INS\t0x%08X\t", val);
+
+	switch (val & BLT_INS_S1_MASK) {
+	case BLT_INS_S1_OFF:
+		break;
+	case BLT_INS_S1_MEM:
+		seq_puts(s, "SRC1=mem - ");
+		break;
+	case BLT_INS_S1_CF:
+		seq_puts(s, "SRC1=ColorFill - ");
+		break;
+	case BLT_INS_S1_COPY:
+		seq_puts(s, "SRC1=copy - ");
+		break;
+	case BLT_INS_S1_FILL:
+		seq_puts(s, "SRC1=fil - ");
+		break;
+	default:
+		seq_puts(s, "SRC1=??? - ");
+		break;
+	}
+
+	switch (val & BLT_INS_S2_MASK) {
+	case BLT_INS_S2_OFF:
+		break;
+	case BLT_INS_S2_MEM:
+		seq_puts(s, "SRC2=mem - ");
+		break;
+	case BLT_INS_S2_CF:
+		seq_puts(s, "SRC2=ColorFill - ");
+		break;
+	default:
+		seq_puts(s, "SRC2=??? - ");
+		break;
+	}
+
+	if ((val & BLT_INS_S3_MASK) == BLT_INS_S3_MEM)
+		seq_puts(s, "SRC3=mem - ");
+
+	if (val & BLT_INS_IVMX)
+		seq_puts(s, "IVMX - ");
+	if (val & BLT_INS_CLUT)
+		seq_puts(s, "CLUT - ");
+	if (val & BLT_INS_SCALE)
+		seq_puts(s, "Scale - ");
+	if (val & BLT_INS_FLICK)
+		seq_puts(s, "Flicker - ");
+	if (val & BLT_INS_CLIP)
+		seq_puts(s, "Clip - ");
+	if (val & BLT_INS_CKEY)
+		seq_puts(s, "ColorKey - ");
+	if (val & BLT_INS_OVMX)
+		seq_puts(s, "OVMX - ");
+	if (val & BLT_INS_DEI)
+		seq_puts(s, "Deint - ");
+	if (val & BLT_INS_PMASK)
+		seq_puts(s, "PlaneMask - ");
+	if (val & BLT_INS_VC1R)
+		seq_puts(s, "VC1R - ");
+	if (val & BLT_INS_ROTATE)
+		seq_puts(s, "Rotate - ");
+	if (val & BLT_INS_GRAD)
+		seq_puts(s, "GradFill - ");
+	if (val & BLT_INS_AQLOCK)
+		seq_puts(s, "AQLock - ");
+	if (val & BLT_INS_PACE)
+		seq_puts(s, "Pace - ");
+	if (val & BLT_INS_IRQ)
+		seq_puts(s, "IRQ - ");
+
+	seq_puts(s, "\n");
+}
+
+static void bdisp_dbg_dump_tty(struct seq_file *s, u32 val)
+{
+	seq_printf(s, "TTY\t0x%08X\t", val);
+	seq_printf(s, "Pitch=%d - ", val & 0xFFFF);
+
+	switch ((val & BLT_TTY_COL_MASK) >> BLT_TTY_COL_SHIFT) {
+	case BDISP_RGB565:
+		seq_puts(s, "RGB565 - ");
+		break;
+	case BDISP_XRGB8888:
+		seq_puts(s, "xRGB888 - ");
+		break;
+	case BDISP_ARGB8888:
+		seq_puts(s, "ARGB8888 - ");
+		break;
+	case BDISP_NV12:
+		seq_puts(s, "NV12 - ");
+		break;
+	case BDISP_YUV_3B:
+		seq_puts(s, "YUV420P - ");
+		break;
+	default:
+		seq_puts(s, "ColorFormat ??? - ");
+		break;
+	}
+
+	if (val & BLT_TTY_ALPHA_R)
+		seq_puts(s, "AlphaRange - ");
+	if (val & BLT_TTY_CR_NOT_CB)
+		seq_puts(s, "CrNotCb - ");
+	if (val & BLT_TTY_MB)
+		seq_puts(s, "MB - ");
+	if (val & BLT_TTY_HSO)
+		seq_puts(s, "HSO inverse - ");
+	if (val & BLT_TTY_VSO)
+		seq_puts(s, "VSO inverse - ");
+	if (val & BLT_TTY_DITHER)
+		seq_puts(s, "Dither - ");
+	if (val & BLT_TTY_CHROMA)
+		seq_puts(s, "Write CHROMA - ");
+	if (val & BLT_TTY_BIG_END)
+		seq_puts(s, "BigEndian - ");
+
+	seq_puts(s, "\n");
+}
+
+static void bdisp_dbg_dump_xy(struct seq_file *s, u32 val, char *name)
+{
+	seq_printf(s, "%s\t0x%08X\t", name, val);
+	seq_printf(s, "(%d,%d)\n", val & 0xFFFF, (val >> 16));
+}
+
+static void bdisp_dbg_dump_sz(struct seq_file *s, u32 val, char *name)
+{
+	seq_printf(s, "%s\t0x%08X\t", name, val);
+	seq_printf(s, "%dx%d\n", val & 0x1FFF, (val >> 16) & 0x1FFF);
+}
+
+static void bdisp_dbg_dump_sty(struct seq_file *s,
+			       u32 val, u32 addr, char *name)
+{
+	bool s1, s2, s3;
+
+	seq_printf(s, "%s\t0x%08X\t", name, val);
+
+	if (!addr || !name || (strlen(name) < 2))
+		goto done;
+
+	s1 = name[strlen(name) - 1] == '1';
+	s2 = name[strlen(name) - 1] == '2';
+	s3 = name[strlen(name) - 1] == '3';
+
+	seq_printf(s, "Pitch=%d - ", val & 0xFFFF);
+
+	switch ((val & BLT_TTY_COL_MASK) >> BLT_TTY_COL_SHIFT) {
+	case BDISP_RGB565:
+		seq_puts(s, "RGB565 - ");
+		break;
+	case BDISP_XRGB8888:
+		seq_puts(s, "xRGB888 - ");
+		break;
+	case BDISP_ARGB8888:
+		seq_puts(s, "ARGB888 - ");
+		break;
+	case BDISP_NV12:
+		seq_puts(s, "NV12 - ");
+		break;
+	case BDISP_YUV_3B:
+		seq_puts(s, "YUV420P - ");
+		break;
+	default:
+		seq_puts(s, "ColorFormat ??? - ");
+		break;
+	}
+
+	if ((val & BLT_TTY_ALPHA_R) && !s3)
+		seq_puts(s, "AlphaRange - ");
+	if ((val & BLT_S1TY_A1_SUBSET) && !s3)
+		seq_puts(s, "A1SubSet - ");
+	if ((val & BLT_TTY_MB) && !s1)
+		seq_puts(s, "MB - ");
+	if (val & BLT_TTY_HSO)
+		seq_puts(s, "HSO inverse - ");
+	if (val & BLT_TTY_VSO)
+		seq_puts(s, "VSO inverse - ");
+	if ((val & BLT_S1TY_CHROMA_EXT) && (s1 || s2))
+		seq_puts(s, "ChromaExt - ");
+	if ((val & BLT_S3TY_BLANK_ACC) && s3)
+		seq_puts(s, "Blank Acc - ");
+	if ((val & BTL_S1TY_SUBBYTE) && !s3)
+		seq_puts(s, "SubByte - ");
+	if ((val & BLT_S1TY_RGB_EXP) && !s3)
+		seq_puts(s, "RGBExpand - ");
+	if ((val & BLT_TTY_BIG_END) && !s3)
+		seq_puts(s, "BigEndian - ");
+
+done:
+	seq_puts(s, "\n");
+}
+
+static void bdisp_dbg_dump_fctl(struct seq_file *s, u32 val)
+{
+	seq_printf(s, "FCTL\t0x%08X\t", val);
+
+	if ((val & BLT_FCTL_Y_HV_SCALE) == BLT_FCTL_Y_HV_SCALE)
+		seq_puts(s, "Resize Luma - ");
+	else if ((val & BLT_FCTL_Y_HV_SCALE) == BLT_FCTL_Y_HV_SAMPLE)
+		seq_puts(s, "Sample Luma - ");
+
+	if ((val & BLT_FCTL_HV_SCALE) == BLT_FCTL_HV_SCALE)
+		seq_puts(s, "Resize Chroma");
+	else if ((val & BLT_FCTL_HV_SCALE) == BLT_FCTL_HV_SAMPLE)
+		seq_puts(s, "Sample Chroma");
+
+	seq_puts(s, "\n");
+}
+
+static void bdisp_dbg_dump_rsf(struct seq_file *s, u32 val, char *name)
+{
+	u32 inc;
+
+	seq_printf(s, "%s\t0x%08X\t", name, val);
+
+	if (!val)
+		goto done;
+
+	inc = val & 0xFFFF;
+	seq_printf(s, "H: %d(6.10) / scale~%dx0.1 - ", inc, 1024 * 10 / inc);
+
+	inc = val >> 16;
+	seq_printf(s, "V: %d(6.10) / scale~%dx0.1", inc, 1024 * 10 / inc);
+
+done:
+	seq_puts(s, "\n");
+}
+
+static void bdisp_dbg_dump_rzi(struct seq_file *s, u32 val, char *name)
+{
+	seq_printf(s, "%s\t0x%08X\t", name, val);
+
+	if (!val)
+		goto done;
+
+	seq_printf(s, "H: init=%d repeat=%d - ", val & 0x3FF, (val >> 12) & 7);
+	val >>= 16;
+	seq_printf(s, "V: init=%d repeat=%d", val & 0x3FF, (val >> 12) & 7);
+
+done:
+	seq_puts(s, "\n");
+}
+
+static void bdisp_dbg_dump_ivmx(struct seq_file *s,
+				u32 c0, u32 c1, u32 c2, u32 c3)
+{
+	seq_printf(s, "IVMX0\t0x%08X\n", c0);
+	seq_printf(s, "IVMX1\t0x%08X\n", c1);
+	seq_printf(s, "IVMX2\t0x%08X\n", c2);
+	seq_printf(s, "IVMX3\t0x%08X\t", c3);
+
+	if (!c0 && !c1 && !c2 && !c3) {
+		seq_puts(s, "\n");
+		return;
+	}
+
+	if ((c0 == bdisp_rgb_to_yuv[0]) &&
+	    (c1 == bdisp_rgb_to_yuv[1]) &&
+	    (c2 == bdisp_rgb_to_yuv[2]) &&
+	    (c3 == bdisp_rgb_to_yuv[3])) {
+		seq_puts(s, "RGB to YUV\n");
+		return;
+	}
+
+	if ((c0 == bdisp_yuv_to_rgb[0]) &&
+	    (c1 == bdisp_yuv_to_rgb[1]) &&
+	    (c2 == bdisp_yuv_to_rgb[2]) &&
+	    (c3 == bdisp_yuv_to_rgb[3])) {
+		seq_puts(s, "YUV to RGB\n");
+		return;
+	}
+	seq_puts(s, "Unknown conversion\n");
+}
+
+static int bdisp_dbg_last_nodes(struct seq_file *s, void *data)
+{
+	/* Not dumping all fields, focusing on significant ones */
+	struct bdisp_dev *bdisp = s->private;
+	struct bdisp_node *node;
+	int i = 0;
+
+	if (!bdisp->dbg.copy_node[0]) {
+		seq_puts(s, "No node built yet\n");
+		return 0;
+	}
+
+	do {
+		node = bdisp->dbg.copy_node[i];
+		if (!node)
+			break;
+		seq_printf(s, "--------\nNode %d:\n", i);
+		seq_puts(s, "-- General --\n");
+		seq_printf(s, "NIP\t0x%08X\n", node->nip);
+		seq_printf(s, "CIC\t0x%08X\n", node->cic);
+		bdisp_dbg_dump_ins(s, node->ins);
+		seq_printf(s, "ACK\t0x%08X\n", node->ack);
+		seq_puts(s, "-- Target --\n");
+		seq_printf(s, "TBA\t0x%08X\n", node->tba);
+		bdisp_dbg_dump_tty(s, node->tty);
+		bdisp_dbg_dump_xy(s, node->txy, "TXY");
+		bdisp_dbg_dump_sz(s, node->tsz, "TSZ");
+		/* Color Fill not dumped */
+		seq_puts(s, "-- Source 1 --\n");
+		seq_printf(s, "S1BA\t0x%08X\n", node->s1ba);
+		bdisp_dbg_dump_sty(s, node->s1ty, node->s1ba, "S1TY");
+		bdisp_dbg_dump_xy(s, node->s1xy, "S1XY");
+		seq_puts(s, "-- Source 2 --\n");
+		seq_printf(s, "S2BA\t0x%08X\n", node->s2ba);
+		bdisp_dbg_dump_sty(s, node->s2ty, node->s2ba, "S2TY");
+		bdisp_dbg_dump_xy(s, node->s2xy, "S2XY");
+		bdisp_dbg_dump_sz(s, node->s2sz, "S2SZ");
+		seq_puts(s, "-- Source 3 --\n");
+		seq_printf(s, "S3BA\t0x%08X\n", node->s3ba);
+		bdisp_dbg_dump_sty(s, node->s3ty, node->s3ba, "S3TY");
+		bdisp_dbg_dump_xy(s, node->s3xy, "S3XY");
+		bdisp_dbg_dump_sz(s, node->s3sz, "S3SZ");
+		/* Clipping not dumped */
+		/* CLUT not dumped */
+		seq_puts(s, "-- Filter & Mask --\n");
+		bdisp_dbg_dump_fctl(s, node->fctl);
+		/* PMK not dumped */
+		seq_puts(s, "-- Chroma Filter --\n");
+		bdisp_dbg_dump_rsf(s, node->rsf, "RSF");
+		bdisp_dbg_dump_rzi(s, node->rzi, "RZI");
+		seq_printf(s, "HFP\t0x%08X\n", node->hfp);
+		seq_printf(s, "VFP\t0x%08X\n", node->vfp);
+		seq_puts(s, "-- Luma Filter --\n");
+		bdisp_dbg_dump_rsf(s, node->y_rsf, "Y_RSF");
+		bdisp_dbg_dump_rzi(s, node->y_rzi, "Y_RZI");
+		seq_printf(s, "Y_HFP\t0x%08X\n", node->y_hfp);
+		seq_printf(s, "Y_VFP\t0x%08X\n", node->y_vfp);
+		/* Flicker not dumped */
+		/* Color key not dumped */
+		/* Reserved not dumped */
+		/* Static Address & User not dumped */
+		seq_puts(s, "-- Input Versatile Matrix --\n");
+		bdisp_dbg_dump_ivmx(s, node->ivmx0, node->ivmx1,
+				    node->ivmx2, node->ivmx3);
+		/* Output Versatile Matrix not dumped */
+		/* Pace not dumped */
+		/* VC1R & DEI not dumped */
+		/* Gradient Fill not dumped */
+	} while ((++i < MAX_NB_NODE) && node->nip);
+
+	return 0;
+}
+
+static int bdisp_dbg_last_nodes_raw(struct seq_file *s, void *data)
+{
+	struct bdisp_dev *bdisp = s->private;
+	struct bdisp_node *node;
+	u32 *val;
+	int j, i = 0;
+
+	if (!bdisp->dbg.copy_node[0]) {
+		seq_puts(s, "No node built yet\n");
+		return 0;
+	}
+
+	do {
+		node = bdisp->dbg.copy_node[i];
+		if (!node)
+			break;
+
+		seq_printf(s, "--------\nNode %d:\n", i);
+		val = (u32 *)node;
+		for (j = 0; j < sizeof(struct bdisp_node) / sizeof(u32); j++)
+			seq_printf(s, "0x%08X\n", *val++);
+	} while ((++i < MAX_NB_NODE) && node->nip);
+
+	return 0;
+}
+
+static const char *bdisp_fmt_to_str(struct bdisp_frame frame)
+{
+	switch (frame.fmt->pixelformat) {
+	case V4L2_PIX_FMT_YUV420:
+		return "YUV420P";
+	case V4L2_PIX_FMT_NV12:
+		if (frame.field == V4L2_FIELD_INTERLACED)
+			return "NV12 interlaced";
+		else
+			return "NV12";
+	case V4L2_PIX_FMT_RGB565:
+		return "RGB16";
+	case V4L2_PIX_FMT_XBGR32:
+		return "XRGB";
+	case V4L2_PIX_FMT_ABGR32:
+		return "ARGB";
+	default:
+		return "????";
+	}
+}
+
+static int bdisp_dbg_last_request(struct seq_file *s, void *data)
+{
+	struct bdisp_dev *bdisp = s->private;
+	struct bdisp_request *request = &bdisp->dbg.copy_request;
+	struct bdisp_frame src, dst;
+
+	if (!request->nb_req) {
+		seq_puts(s, "No request\n");
+		return 0;
+	}
+
+	src = request->src;
+	dst = request->dst;
+
+	seq_printf(s, "\nRequest #%d\n", request->nb_req);
+
+	seq_printf(s, "Format:    %s\t\t\t%s\n",
+		   bdisp_fmt_to_str(src), bdisp_fmt_to_str(dst));
+	seq_printf(s, "Crop area: %dx%d @ %d,%d  ==>\t%dx%d @ %d,%d\n",
+		   src.crop.width, src.crop.height,
+		   src.crop.left, src.crop.top,
+		   dst.crop.width, dst.crop.height,
+		   dst.crop.left, dst.crop.top);
+	seq_printf(s, "Buff size: %dx%d\t\t%dx%d\n\n",
+		   src.width, src.height, dst.width, dst.height);
+
+	if (request->hflip)
+		seq_puts(s, "Horizontal flip\n\n");
+
+	if (request->vflip)
+		seq_puts(s, "Vertical flip\n\n");
+
+	return 0;
+}
+
+#define DUMP(reg) seq_printf(s, #reg " \t0x%08X\n", readl(bdisp->regs + reg))
+
+static int bdisp_dbg_regs(struct seq_file *s, void *data)
+{
+	struct bdisp_dev *bdisp = s->private;
+	int ret;
+	unsigned int i;
+
+	ret = pm_runtime_get_sync(bdisp->dev);
+	if (ret < 0) {
+		seq_puts(s, "Cannot wake up IP\n");
+		return 0;
+	}
+
+	seq_printf(s, "Reg @ = 0x%p\n", bdisp->regs);
+
+	seq_puts(s, "\nStatic:\n");
+	DUMP(BLT_CTL);
+	DUMP(BLT_ITS);
+	DUMP(BLT_STA1);
+	DUMP(BLT_AQ1_CTL);
+	DUMP(BLT_AQ1_IP);
+	DUMP(BLT_AQ1_LNA);
+	DUMP(BLT_AQ1_STA);
+	DUMP(BLT_ITM0);
+
+	seq_puts(s, "\nPlugs:\n");
+	DUMP(BLT_PLUGS1_OP2);
+	DUMP(BLT_PLUGS1_CHZ);
+	DUMP(BLT_PLUGS1_MSZ);
+	DUMP(BLT_PLUGS1_PGZ);
+	DUMP(BLT_PLUGS2_OP2);
+	DUMP(BLT_PLUGS2_CHZ);
+	DUMP(BLT_PLUGS2_MSZ);
+	DUMP(BLT_PLUGS2_PGZ);
+	DUMP(BLT_PLUGS3_OP2);
+	DUMP(BLT_PLUGS3_CHZ);
+	DUMP(BLT_PLUGS3_MSZ);
+	DUMP(BLT_PLUGS3_PGZ);
+	DUMP(BLT_PLUGT_OP2);
+	DUMP(BLT_PLUGT_CHZ);
+	DUMP(BLT_PLUGT_MSZ);
+	DUMP(BLT_PLUGT_PGZ);
+
+	seq_puts(s, "\nNode:\n");
+	DUMP(BLT_NIP);
+	DUMP(BLT_CIC);
+	DUMP(BLT_INS);
+	DUMP(BLT_ACK);
+	DUMP(BLT_TBA);
+	DUMP(BLT_TTY);
+	DUMP(BLT_TXY);
+	DUMP(BLT_TSZ);
+	DUMP(BLT_S1BA);
+	DUMP(BLT_S1TY);
+	DUMP(BLT_S1XY);
+	DUMP(BLT_S2BA);
+	DUMP(BLT_S2TY);
+	DUMP(BLT_S2XY);
+	DUMP(BLT_S2SZ);
+	DUMP(BLT_S3BA);
+	DUMP(BLT_S3TY);
+	DUMP(BLT_S3XY);
+	DUMP(BLT_S3SZ);
+	DUMP(BLT_FCTL);
+	DUMP(BLT_RSF);
+	DUMP(BLT_RZI);
+	DUMP(BLT_HFP);
+	DUMP(BLT_VFP);
+	DUMP(BLT_Y_RSF);
+	DUMP(BLT_Y_RZI);
+	DUMP(BLT_Y_HFP);
+	DUMP(BLT_Y_VFP);
+	DUMP(BLT_IVMX0);
+	DUMP(BLT_IVMX1);
+	DUMP(BLT_IVMX2);
+	DUMP(BLT_IVMX3);
+	DUMP(BLT_OVMX0);
+	DUMP(BLT_OVMX1);
+	DUMP(BLT_OVMX2);
+	DUMP(BLT_OVMX3);
+	DUMP(BLT_DEI);
+
+	seq_puts(s, "\nFilter:\n");
+	for (i = 0; i < BLT_NB_H_COEF; i++) {
+		seq_printf(s, "BLT_HFC%d \t0x%08X\n", i,
+			   readl(bdisp->regs + BLT_HFC_N + i * 4));
+	}
+	for (i = 0; i < BLT_NB_V_COEF; i++) {
+		seq_printf(s, "BLT_VFC%d \t0x%08X\n", i,
+			   readl(bdisp->regs + BLT_VFC_N + i * 4));
+	}
+
+	seq_puts(s, "\nLuma filter:\n");
+	for (i = 0; i < BLT_NB_H_COEF; i++) {
+		seq_printf(s, "BLT_Y_HFC%d \t0x%08X\n", i,
+			   readl(bdisp->regs + BLT_Y_HFC_N + i * 4));
+	}
+	for (i = 0; i < BLT_NB_V_COEF; i++) {
+		seq_printf(s, "BLT_Y_VFC%d \t0x%08X\n", i,
+			   readl(bdisp->regs + BLT_Y_VFC_N + i * 4));
+	}
+
+	pm_runtime_put(bdisp->dev);
+
+	return 0;
+}
+
+static int bdisp_dbg_perf(struct seq_file *s, void *data)
+{
+	struct bdisp_dev *bdisp = s->private;
+	struct bdisp_request *request = &bdisp->dbg.copy_request;
+	s64 avg_time_us;
+	int avg_fps, min_fps, max_fps, last_fps;
+
+	if (!request->nb_req) {
+		seq_puts(s, "No request\n");
+		return 0;
+	}
+
+	avg_time_us = bdisp->dbg.tot_duration;
+	do_div(avg_time_us, request->nb_req);
+
+	avg_fps = 1000000;
+	min_fps = 1000000;
+	max_fps = 1000000;
+	last_fps = 1000000;
+	do_div(avg_fps, avg_time_us);
+	do_div(min_fps, bdisp->dbg.min_duration);
+	do_div(max_fps, bdisp->dbg.max_duration);
+	do_div(last_fps, bdisp->dbg.last_duration);
+
+	seq_printf(s, "HW processing (%d requests):\n", request->nb_req);
+	seq_printf(s, " Average: %5lld us  (%3d fps)\n",
+		   avg_time_us, avg_fps);
+	seq_printf(s, " Min-Max: %5lld us  (%3d fps) - %5lld us  (%3d fps)\n",
+		   bdisp->dbg.min_duration, min_fps,
+		   bdisp->dbg.max_duration, max_fps);
+	seq_printf(s, " Last:    %5lld us  (%3d fps)\n",
+		   bdisp->dbg.last_duration, last_fps);
+
+	return 0;
+}
+
+#define bdisp_dbg_declare(name) \
+	static int bdisp_dbg_##name##_open(struct inode *i, struct file *f) \
+	{ \
+		return single_open(f, bdisp_dbg_##name, i->i_private); \
+	} \
+	static const struct file_operations bdisp_dbg_##name##_fops = { \
+		.open           = bdisp_dbg_##name##_open, \
+		.read           = seq_read, \
+		.llseek         = seq_lseek, \
+		.release        = single_release, \
+	}
+
+#define bdisp_dbg_create_entry(name) \
+	debugfs_create_file(#name, S_IRUGO, bdisp->dbg.debugfs_entry, bdisp, \
+			    &bdisp_dbg_##name##_fops)
+
+bdisp_dbg_declare(regs);
+bdisp_dbg_declare(last_nodes);
+bdisp_dbg_declare(last_nodes_raw);
+bdisp_dbg_declare(last_request);
+bdisp_dbg_declare(perf);
+
+int bdisp_debugfs_create(struct bdisp_dev *bdisp)
+{
+	char dirname[16];
+
+	snprintf(dirname, sizeof(dirname), "%s%d", BDISP_NAME, bdisp->id);
+	bdisp->dbg.debugfs_entry = debugfs_create_dir(dirname, NULL);
+	if (!bdisp->dbg.debugfs_entry)
+		goto err;
+
+	if (!bdisp_dbg_create_entry(regs))
+		goto err;
+
+	if (!bdisp_dbg_create_entry(last_nodes))
+		goto err;
+
+	if (!bdisp_dbg_create_entry(last_nodes_raw))
+		goto err;
+
+	if (!bdisp_dbg_create_entry(last_request))
+		goto err;
+
+	if (!bdisp_dbg_create_entry(perf))
+		goto err;
+
+	return 0;
+
+err:
+	bdisp_debugfs_remove(bdisp);
+	return 0;
+}
+
+void bdisp_debugfs_remove(struct bdisp_dev *bdisp)
+{
+	debugfs_remove_recursive(bdisp->dbg.debugfs_entry);
+	bdisp->dbg.debugfs_entry = NULL;
+}

drivers/media/platform/sti/bdisp/bdisp-hw.c

@@ -740,6 +740,43 @@ static int bdisp_hw_build_all_nodes(struct bdisp_ctx *ctx)
 	return 0;
 }
 
+/**
+ * bdisp_hw_save_request
+ * @ctx:        device context
+ *
+ * Save a copy of the request and of the built nodes
+ *
+ * RETURNS:
+ * None
+ */
+static void bdisp_hw_save_request(struct bdisp_ctx *ctx)
+{
+	struct bdisp_node **copy_node = ctx->bdisp_dev->dbg.copy_node;
+	struct bdisp_request *request = &ctx->bdisp_dev->dbg.copy_request;
+	struct bdisp_node **node = ctx->node;
+	int i;
+
+	/* Request copy */
+	request->src = ctx->src;
+	request->dst = ctx->dst;
+	request->hflip = ctx->hflip;
+	request->vflip = ctx->vflip;
+	request->nb_req++;
+
+	/* Nodes copy */
+	for (i = 0; i < MAX_NB_NODE; i++) {
+		/* Allocate memory if not done yet */
+		if (!copy_node[i]) {
+			copy_node[i] = devm_kzalloc(ctx->bdisp_dev->dev,
+						    sizeof(*copy_node),
+						    GFP_KERNEL);
+			if (!copy_node[i])
+				return;
+		}
+		copy_node[i] = node[i];
+	}
+}
+
 /**
  * bdisp_hw_update
  * @ctx:        device context
@@ -765,6 +802,9 @@ int bdisp_hw_update(struct bdisp_ctx *ctx)
 		return ret;
 	}
 
+	/* Save a copy of the request */
+	bdisp_hw_save_request(ctx);
+
 	/* Configure interrupt to 'Last Node Reached for AQ1' */
 	writel(BLT_AQ1_CTL_CFG, bdisp->regs + BLT_AQ1_CTL);
 	writel(BLT_ITS_AQ1_LNA, bdisp->regs + BLT_ITM0);

drivers/media/platform/sti/bdisp/bdisp-v4l2.c

@@ -336,6 +336,8 @@ static void bdisp_device_run(void *priv)
 		goto out;
 	}
 
+	bdisp_dbg_perf_begin(bdisp);
+
 	err = bdisp_hw_reset(bdisp);
 	if (err) {
 		dev_err(bdisp->dev, "could not get HW ready\n");
@@ -1075,6 +1077,8 @@ static irqreturn_t bdisp_irq_thread(int irq, void *priv)
 
 	spin_lock(&bdisp->slock);
 
+	bdisp_dbg_perf_end(bdisp);
+
 	cancel_delayed_work(&bdisp->timeout_work);
 
 	if (!test_and_clear_bit(ST_M2M_RUNNING, &bdisp->state))
@@ -1247,6 +1251,8 @@ static int bdisp_remove(struct platform_device *pdev)
 
 	pm_runtime_disable(&pdev->dev);
 
+	bdisp_debugfs_remove(bdisp);
+
 	v4l2_device_unregister(&bdisp->v4l2_dev);
 
 	if (!IS_ERR(bdisp->clock))
@@ -1328,12 +1334,19 @@ static int bdisp_probe(struct platform_device *pdev)
 		goto err_clk;
 	}
 
+	/* Debug */
+	ret = bdisp_debugfs_create(bdisp);
+	if (ret) {
+		dev_err(dev, "failed to create debugfs\n");
+		goto err_v4l2;
+	}
+
 	/* Power management */
 	pm_runtime_enable(dev);
 	ret = pm_runtime_get_sync(dev);
 	if (ret < 0) {
 		dev_err(dev, "failed to set PM\n");
-		goto err_v4l2;
+		goto err_dbg;
 	}
 
 	/* Continuous memory allocator */
@@ -1370,6 +1383,8 @@ static int bdisp_probe(struct platform_device *pdev)
 	vb2_dma_contig_cleanup_ctx(bdisp->alloc_ctx);
 err_pm:
 	pm_runtime_put(dev);
+err_dbg:
+	bdisp_debugfs_remove(bdisp);
 err_v4l2:
 	v4l2_device_unregister(&bdisp->v4l2_dev);
 err_clk:

drivers/media/platform/sti/bdisp/bdisp.h

@@ -140,6 +140,29 @@ struct bdisp_m2m_device {
 	int                     refcnt;
 };
 
+/**
+ * struct bdisp_dbg - debug info
+ *
+ * @debugfs_entry: debugfs
+ * @copy_node:     array of last used nodes
+ * @copy_request:  last bdisp request
+ * @hw_start:      start time of last HW request
+ * @last_duration: last HW processing duration in microsecs
+ * @min_duration:  min HW processing duration in microsecs
+ * @max_duration:  max HW processing duration in microsecs
+ * @tot_duration:  total HW processing duration in microsecs
+ */
+struct bdisp_dbg {
+	struct dentry           *debugfs_entry;
+	struct bdisp_node       *copy_node[MAX_NB_NODE];
+	struct bdisp_request    copy_request;
+	ktime_t                 hw_start;
+	s64                     last_duration;
+	s64                     min_duration;
+	s64                     max_duration;
+	s64                     tot_duration;
+};
+
 /**
  * struct bdisp_dev - abstraction for bdisp entity
  *
@@ -158,6 +181,7 @@ struct bdisp_m2m_device {
  * @irq_queue:  interrupt handler waitqueue
  * @work_queue: workqueue to handle timeouts
  * @timeout_work: IRQ timeout structure
+ * @dbg:        debug info
  */
 struct bdisp_dev {
 	struct v4l2_device      v4l2_dev;
@@ -175,6 +199,7 @@ struct bdisp_dev {
 	wait_queue_head_t       irq_queue;
 	struct workqueue_struct *work_queue;
 	struct delayed_work     timeout_work;
+	struct bdisp_dbg        dbg;
 };
 
 void bdisp_hw_free_nodes(struct bdisp_ctx *ctx);
@@ -184,3 +209,8 @@ int bdisp_hw_alloc_filters(struct device *dev);
 int bdisp_hw_reset(struct bdisp_dev *bdisp);
 int bdisp_hw_get_and_clear_irq(struct bdisp_dev *bdisp);
 int bdisp_hw_update(struct bdisp_ctx *ctx);
+
+void bdisp_debugfs_remove(struct bdisp_dev *bdisp);
+int bdisp_debugfs_create(struct bdisp_dev *bdisp);
+void bdisp_dbg_perf_begin(struct bdisp_dev *bdisp);
+void bdisp_dbg_perf_end(struct bdisp_dev *bdisp);