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V4L/DVB (5917): ivtv: improve mailbox responsiveness. 

First try polling for the result of a mailbox command, then
switch to a test/sleep loop. Also reduce the sleep time from 10 ms
to 1 ms. Improves the responsiveness of the mailbox handling.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Hans Verkuil 2007-07-22 08:49:32 -03:00 коммит произвёл Mauro Carvalho Chehab
Родитель ac4251445d
Коммит 0b3e29e6d7
1 изменённых файлов: 11 добавлений и 3 удалений
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14
drivers/media/video/ivtv/ivtv-mailbox.c
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@ -40,6 +40,7 @@
#define API_HIGH_VOL (1 << 5) /* High volume command (i.e. called during encoding or decoding) */ #define API_HIGH_VOL (1 << 5) /* High volume command (i.e. called during encoding or decoding) */
#define API_NO_WAIT_MB (1 << 4) /* Command may not wait for a free mailbox */ #define API_NO_WAIT_MB (1 << 4) /* Command may not wait for a free mailbox */
#define API_NO_WAIT_RES (1 << 5) /* Command may not wait for the result */ #define API_NO_WAIT_RES (1 << 5) /* Command may not wait for the result */
#define API_NO_POLL (1 << 6) /* Avoid pointless polling */
struct ivtv_api_info { struct ivtv_api_info {
int flags; /* Flags, see above */ int flags; /* Flags, see above */
@ -51,7 +52,7 @@ struct ivtv_api_info {
static const struct ivtv_api_info api_info[256] = { static const struct ivtv_api_info api_info[256] = {
/* MPEG encoder API */ /* MPEG encoder API */
API_ENTRY(CX2341X_ENC_PING_FW, API_FAST_RESULT), API_ENTRY(CX2341X_ENC_PING_FW, API_FAST_RESULT),
API_ENTRY(CX2341X_ENC_START_CAPTURE, API_RESULT), API_ENTRY(CX2341X_ENC_START_CAPTURE, API_RESULT | API_NO_POLL),
API_ENTRY(CX2341X_ENC_STOP_CAPTURE, API_RESULT), API_ENTRY(CX2341X_ENC_STOP_CAPTURE, API_RESULT),
API_ENTRY(CX2341X_ENC_SET_AUDIO_ID, API_CACHE), API_ENTRY(CX2341X_ENC_SET_AUDIO_ID, API_CACHE),
API_ENTRY(CX2341X_ENC_SET_VIDEO_ID, API_CACHE), API_ENTRY(CX2341X_ENC_SET_VIDEO_ID, API_CACHE),
@ -96,7 +97,7 @@ static const struct ivtv_api_info api_info[256] = {
/* MPEG decoder API */ /* MPEG decoder API */
API_ENTRY(CX2341X_DEC_PING_FW, API_FAST_RESULT), API_ENTRY(CX2341X_DEC_PING_FW, API_FAST_RESULT),
API_ENTRY(CX2341X_DEC_START_PLAYBACK, API_RESULT), API_ENTRY(CX2341X_DEC_START_PLAYBACK, API_RESULT | API_NO_POLL),
API_ENTRY(CX2341X_DEC_STOP_PLAYBACK, API_RESULT), API_ENTRY(CX2341X_DEC_STOP_PLAYBACK, API_RESULT),
API_ENTRY(CX2341X_DEC_SET_PLAYBACK_SPEED, API_RESULT), API_ENTRY(CX2341X_DEC_SET_PLAYBACK_SPEED, API_RESULT),
API_ENTRY(CX2341X_DEC_STEP_VIDEO, API_RESULT), API_ENTRY(CX2341X_DEC_STEP_VIDEO, API_RESULT),
@ -290,6 +291,13 @@ static int ivtv_api_call(struct ivtv *itv, int cmd, int args, u32 data[])
/* Get results */ /* Get results */
then = jiffies; then = jiffies;
if (!(flags & API_NO_POLL)) {
/* First try to poll, then switch to delays */
for (i = 0; i < 100; i++) {
if (readl(&mbox->flags) & IVTV_MBOX_FIRMWARE_DONE)
break;
}
}
while (!(readl(&mbox->flags) & IVTV_MBOX_FIRMWARE_DONE)) { while (!(readl(&mbox->flags) & IVTV_MBOX_FIRMWARE_DONE)) {
if (jiffies - then > api_timeout) { if (jiffies - then > api_timeout) {
IVTV_DEBUG_WARN("Could not get result (%s)\n", api_info[cmd].name); IVTV_DEBUG_WARN("Could not get result (%s)\n", api_info[cmd].name);
@ -301,7 +309,7 @@ static int ivtv_api_call(struct ivtv *itv, int cmd, int args, u32 data[])
if (flags & API_NO_WAIT_RES) if (flags & API_NO_WAIT_RES)
mdelay(1); mdelay(1);
else else
ivtv_msleep_timeout(10, 0); ivtv_msleep_timeout(1, 0);
} }
if (jiffies - then > msecs_to_jiffies(100)) if (jiffies - then > msecs_to_jiffies(100))
IVTV_DEBUG_WARN("%s took %u jiffies\n", IVTV_DEBUG_WARN("%s took %u jiffies\n",