[media] pwc: Avoid unnecessarily rebuilding the decoder tables
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/pwc/pwc-dec23.c b/drivers/media/video/pwc/pwc-dec23.c
index 6d48c1f..98772ef 100644
--- a/drivers/media/video/pwc/pwc-dec23.c
+++ b/drivers/media/video/pwc/pwc-dec23.c
@@ -301,6 +301,9 @@
mutex_init(&pdec->lock);
+ if (pdec->last_cmd_valid && pdec->last_cmd == cmd[2])
+ return;
+
if (DEVICE_USE_CODEC3(pdev->type)) {
flags = cmd[2] & 0x18;
if (flags == 8)
@@ -347,6 +350,9 @@
for (i=0; i<MAX_OUTER_CROP_VALUE; i++)
pwc_crop_table[MAX_OUTER_CROP_VALUE+256+i] = 255;
#endif
+
+ pdec->last_cmd = cmd[2];
+ pdec->last_cmd_valid = 1;
}
/*
diff --git a/drivers/media/video/pwc/pwc-dec23.h b/drivers/media/video/pwc/pwc-dec23.h
index a29068e..af31d60 100644
--- a/drivers/media/video/pwc/pwc-dec23.h
+++ b/drivers/media/video/pwc/pwc-dec23.h
@@ -31,11 +31,14 @@
{
struct mutex lock;
+ unsigned char last_cmd, last_cmd_valid;
+
unsigned int scalebits;
unsigned int nbitsmask, nbits; /* Number of bits of a color in the compressed stream */
unsigned int reservoir;
unsigned int nbits_in_reservoir;
+
const unsigned char *stream;
int temp_colors[16];
