Re: [PATCH 2/6] media: aspeed: add dprintk for more detailed log control
From: Paul Menzel
Date: Thu Oct 14 2021 - 02:28:33 EST
[Cc: +Steven, +Ingo for tracing questions]
Dear Jammy,
Am 14.10.21 um 05:48 schrieb Jammy Huang:
Add dprintk to categorize the log into NOTICE/INFO/TRACE/IRQ/REG.
The on/off is controlled by module_param, debug.
Currently dev_dbg is dynamic debug, which can be controlled using the
Linux kernel command line or debugfs already?
From your patch:
+MODULE_PARM_DESC(debug, "set debugging level (0=reg,2=irq,4=trace,8=info(|-able)).");
What does (|-able) mean? Maybe give some examples in the commit message
as documentation?
Lastly, instead of parameter name `debug`, I’d use `log_level`, which
would be more accurate.
Why is more granularity needed/useful, and not just debug and non-debug,
where the existing Linux kernel levels `pr_info`, `pr_warn`, … are used?
Looking at the amount of log messages, the granularity does not look needed.
Signed-off-by: Jammy Huang <jammy_huang@xxxxxxxxxxxxxx>
---
drivers/media/platform/aspeed-video.c | 73 ++++++++++++++++++++++-----
1 file changed, 60 insertions(+), 13 deletions(-)
diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
index 6259cf17a7cc..7b8129b0ca5f 100644
--- a/drivers/media/platform/aspeed-video.c
+++ b/drivers/media/platform/aspeed-video.c
@@ -31,6 +31,19 @@
#include <media/v4l2-ioctl.h>
#include <media/videobuf2-dma-contig.h>
+
+#define LOG_REG BIT(4)
+#define LOG_DEBUG BIT(3)
+#define LOG_TRACE BIT(2)
Could ftrace be used for this? It looks like there are static functions.
No idea, if there is already a “native” Linux kernel solution for this.
+#define LOG_INFO BIT(1)
+#define LOG_NOTICE BIT(0)
+
+#define dprintk(level, fmt, arg...) do { \
+ if (debug & level) \
+ pr_debug(pr_fmt("[%s]: " fmt), DEVICE_NAME, ##arg); \
+} while (0)
+
+
#define DEVICE_NAME "aspeed-video"
#define ASPEED_VIDEO_JPEG_NUM_QUALITIES 12
@@ -390,6 +403,8 @@ static const struct v4l2_dv_timings_cap aspeed_video_timings_cap = {
},
};
+static unsigned int debug;
+
static void aspeed_video_init_jpeg_table(u32 *table, bool yuv420)
{
int i;
@@ -437,7 +452,7 @@ static void aspeed_video_update(struct aspeed_video *video, u32 reg, u32 clear,
t &= ~clear;
t |= bits;
writel(t, video->base + reg);
- dev_dbg(video->dev, "update %03x[%08x -> %08x]\n", reg, before,
+ dprintk(LOG_REG, "update %03x[%08x -> %08x]\n", reg, before,
readl(video->base + reg));
}
@@ -445,14 +460,14 @@ static u32 aspeed_video_read(struct aspeed_video *video, u32 reg)
{
u32 t = readl(video->base + reg);
- dev_dbg(video->dev, "read %03x[%08x]\n", reg, t);
+ dprintk(LOG_REG, "read %03x[%08x]\n", reg, t);
return t;
}
static void aspeed_video_write(struct aspeed_video *video, u32 reg, u32 val)
{
writel(val, video->base + reg);
- dev_dbg(video->dev, "write %03x[%08x]\n", reg,
+ dprintk(LOG_REG, "write %03x[%08x]\n", reg,
readl(video->base + reg));
}
@@ -474,13 +489,13 @@ static int aspeed_video_start_frame(struct aspeed_video *video)
u32 seq_ctrl = aspeed_video_read(video, VE_SEQ_CTRL);
if (video->v4l2_input_status) {
- dev_dbg(video->dev, "No signal; don't start frame\n");
+ dprintk(LOG_NOTICE, "No signal; don't start frame\n");
return 0;
}
if (!(seq_ctrl & VE_SEQ_CTRL_COMP_BUSY) ||
!(seq_ctrl & VE_SEQ_CTRL_CAP_BUSY)) {
- dev_dbg(video->dev, "Engine busy; don't start frame\n");
+ dprintk(LOG_NOTICE, "Engine busy; don't start frame\n");
return -EBUSY;
}
@@ -489,7 +504,7 @@ static int aspeed_video_start_frame(struct aspeed_video *video)
struct aspeed_video_buffer, link);
if (!buf) {
spin_unlock_irqrestore(&video->lock, flags);
- dev_dbg(video->dev, "No buffers; don't start frame\n");
+ dprintk(LOG_NOTICE, "No buffers; don't start frame\n");
return -EPROTO;
}
@@ -565,7 +580,7 @@ static void aspeed_video_bufs_done(struct aspeed_video *video,
static void aspeed_video_irq_res_change(struct aspeed_video *video, ulong delay)
{
- dev_dbg(video->dev, "Resolution changed; resetting\n");
+ dprintk(LOG_INFO, "Resolution changed; resetting\n");
set_bit(VIDEO_RES_CHANGE, &video->flags);
clear_bit(VIDEO_FRAME_INPRG, &video->flags);
@@ -590,6 +605,12 @@ static irqreturn_t aspeed_video_irq(int irq, void *arg)
struct aspeed_video *video = arg;
u32 sts = aspeed_video_read(video, VE_INTERRUPT_STATUS);
+ dprintk(LOG_DEBUG, "irq sts=%#x %s%s%s%s\n", sts,
+ sts & VE_INTERRUPT_MODE_DETECT_WD ? ", unlock" : "",
+ sts & VE_INTERRUPT_MODE_DETECT ? ", lock" : "",
+ sts & VE_INTERRUPT_CAPTURE_COMPLETE ? ", capture-done" : "",
+ sts & VE_INTERRUPT_COMP_COMPLETE ? ", comp-done" : "");
+
Please split adding new log messages out into a separate commit.
/*
* Resolution changed or signal was lost; reset the engine and
* re-initialize
@@ -766,7 +787,7 @@ static void aspeed_video_calc_compressed_size(struct aspeed_video *video,
aspeed_video_write(video, VE_STREAM_BUF_SIZE,
compression_buffer_size_reg);
- dev_dbg(video->dev, "Max compressed size: %x\n",
+ dprintk(LOG_INFO, "Max compressed size: %#x\n",
video->max_compressed_size);
}
@@ -804,7 +825,7 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
res_check(video),
MODE_DETECT_TIMEOUT);
if (!rc) {
- dev_dbg(video->dev, "Timed out; first mode detect\n");
+ dprintk(LOG_INFO, "Timed out; first mode detect\n");
clear_bit(VIDEO_RES_DETECT, &video->flags);
return;
}
@@ -822,7 +843,7 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
MODE_DETECT_TIMEOUT);
clear_bit(VIDEO_RES_DETECT, &video->flags);
if (!rc) {
- dev_dbg(video->dev, "Timed out; second mode detect\n");
+ dprintk(LOG_INFO, "Timed out; second mode detect\n");
return;
}
@@ -856,7 +877,7 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
} while (invalid_resolution && (tries++ < INVALID_RESOLUTION_RETRIES));
if (invalid_resolution) {
- dev_dbg(video->dev, "Invalid resolution detected\n");
+ dprintk(LOG_NOTICE, "Invalid resolution detected\n");
return;
}
@@ -873,7 +894,7 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
aspeed_video_update(video, VE_SEQ_CTRL, 0,
VE_SEQ_CTRL_AUTO_COMP | VE_SEQ_CTRL_EN_WATCHDOG);
- dev_dbg(video->dev, "Got resolution: %dx%d\n", det->width,
+ dprintk(LOG_INFO, "Got resolution: %dx%d\n", det->width,
det->height);
}
@@ -907,6 +928,7 @@ static void aspeed_video_set_resolution(struct aspeed_video *video)
/* Don't use direct mode below 1024 x 768 (irqs don't fire) */
if (size < DIRECT_FETCH_THRESHOLD) {
+ dprintk(LOG_INFO, "Capture: Sync Mode\n");
aspeed_video_write(video, VE_TGS_0,
FIELD_PREP(VE_TGS_FIRST,
video->frame_left - 1) |
@@ -918,6 +940,7 @@ static void aspeed_video_set_resolution(struct aspeed_video *video)
video->frame_bottom + 1));
aspeed_video_update(video, VE_CTRL, 0, VE_CTRL_INT_DE);
} else {
+ dprintk(LOG_INFO, "Capture: Direct Mode\n");
aspeed_video_update(video, VE_CTRL, 0, VE_CTRL_DIRECT_FETCH);
}
@@ -934,6 +957,10 @@ static void aspeed_video_set_resolution(struct aspeed_video *video)
if (!aspeed_video_alloc_buf(video, &video->srcs[1], size))
goto err_mem;
+ dprintk(LOG_INFO, "src buf0 addr(%#x) size(%d)\n",
+ video->srcs[0].dma, video->srcs[0].size);
+ dprintk(LOG_INFO, "src buf1 addr(%#x) size(%d)\n",
+ video->srcs[1].dma, video->srcs[1].size);
aspeed_video_write(video, VE_SRC0_ADDR, video->srcs[0].dma);
aspeed_video_write(video, VE_SRC1_ADDR, video->srcs[1].dma);
}
@@ -1010,6 +1037,8 @@ static void aspeed_video_start(struct aspeed_video *video)
static void aspeed_video_stop(struct aspeed_video *video)
{
+ dprintk(LOG_TRACE, "%s\n", __func__);
+
set_bit(VIDEO_STOPPED, &video->flags);
cancel_delayed_work_sync(&video->res_work);
@@ -1198,6 +1227,9 @@ static int aspeed_video_set_dv_timings(struct file *file, void *fh,
timings->type = V4L2_DV_BT_656_1120;
+ dprintk(LOG_INFO, "set new timings(%dx%d)\n", timings->bt.width,
+ timings->bt.height);
+
return 0;
}
@@ -1362,6 +1394,8 @@ static void aspeed_video_resolution_work(struct work_struct *work)
res_work);
u32 input_status = video->v4l2_input_status;
+ dprintk(LOG_TRACE, "%s+\n", __func__);
+
aspeed_video_on(video);
/* Exit early in case no clients remain */
@@ -1380,6 +1414,7 @@ static void aspeed_video_resolution_work(struct work_struct *work)
.u.src_change.changes = V4L2_EVENT_SRC_CH_RESOLUTION,
};
+ dprintk(LOG_INFO, "fire source change event\n");
v4l2_event_queue(&video->vdev, &ev);
} else if (test_bit(VIDEO_STREAMING, &video->flags)) {
/* No resolution change so just restart streaming */
@@ -1389,6 +1424,8 @@ static void aspeed_video_resolution_work(struct work_struct *work)
done:
clear_bit(VIDEO_RES_CHANGE, &video->flags);
wake_up_interruptible_all(&video->wait);
+
+ dprintk(LOG_TRACE, "%s-\n", __func__);
}
static int aspeed_video_open(struct file *file)
@@ -1476,6 +1513,7 @@ static int aspeed_video_start_streaming(struct vb2_queue *q,
int rc;
struct aspeed_video *video = vb2_get_drv_priv(q);
+ dprintk(LOG_TRACE, "%s\n", __func__);
video->sequence = 0;
video->perf.duration_max = 0;
video->perf.duration_min = 0xffffffff;
@@ -1495,13 +1533,15 @@ static void aspeed_video_stop_streaming(struct vb2_queue *q)
int rc;
struct aspeed_video *video = vb2_get_drv_priv(q);
+ dprintk(LOG_TRACE, "%s+\n", __func__);
+
clear_bit(VIDEO_STREAMING, &video->flags);
rc = wait_event_timeout(video->wait,
!test_bit(VIDEO_FRAME_INPRG, &video->flags),
STOP_TIMEOUT);
if (!rc) {
- dev_dbg(video->dev, "Timed out when stopping streaming\n");
+ dprintk(LOG_NOTICE, "Timed out when stopping streaming\n");
/*
* Need to force stop any DMA and try and get HW into a good
@@ -1516,6 +1556,7 @@ static void aspeed_video_stop_streaming(struct vb2_queue *q)
}
aspeed_video_bufs_done(video, VB2_BUF_STATE_ERROR);
+ dprintk(LOG_TRACE, "%s-\n", __func__);
}
static void aspeed_video_buf_queue(struct vb2_buffer *vb)
@@ -1715,6 +1756,7 @@ static int aspeed_video_init(struct aspeed_video *video)
dev_err(dev, "Unable to request IRQ %d\n", irq);
return rc;
}
+ dev_info(video->dev, "irq %d\n", irq);
video->eclk = devm_clk_get(dev, "eclk");
if (IS_ERR(video->eclk)) {
@@ -1751,6 +1793,8 @@ static int aspeed_video_init(struct aspeed_video *video)
rc = -ENOMEM;
goto err_release_reserved_mem;
}
+ dev_info(video->dev, "alloc mem size(%d) at %#x for jpeg header\n",
+ VE_JPEG_HEADER_SIZE, video->jpeg.dma);
aspeed_video_init_jpeg_table(video->jpeg.virt, video->yuv420);
@@ -1856,6 +1900,9 @@ static struct platform_driver aspeed_video_driver = {
module_platform_driver(aspeed_video_driver);
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "set debugging level (0=reg,2=irq,4=trace,8=info(|-able)).");
+
MODULE_DESCRIPTION("ASPEED Video Engine Driver");
MODULE_AUTHOR("Eddie James");
MODULE_LICENSE("GPL v2");
Kind regards,
Paul