diff options
| author | Andy Walls <awalls@radix.net> | 2010-02-10 15:34:46 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-02-26 15:11:07 -0300 |
| commit | 587808d5f59e842f9258a15e88ad530fcf6e6763 (patch) | |
| tree | 07252eaff987faf5ad1b6256d520c13ab90e4554 /drivers/media/video/ivtv/ivtv-mailbox.c | |
| parent | 00cb9f6920aaeb34bcef146085ae57e363641a85 (diff) | |
V4L/DVB: ivtv: Fix ivtv_api_get_data() to avoid unneeded IO during IRQ handling
ivtv_api_get_data() was performing more PCI MMIO than needed, resulting
often in it accounting for more than half the total time spent in
ivtv_irq_handler(). Now it only reads at most 7 of the 16 mailbox data words
over the PCI bus, and in some instances only 2 or 3 data words as needed.
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/ivtv/ivtv-mailbox.c')
| -rw-r--r-- | drivers/media/video/ivtv/ivtv-mailbox.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/media/video/ivtv/ivtv-mailbox.c b/drivers/media/video/ivtv/ivtv-mailbox.c index 1b5c0ac09a8..84577f6f41a 100644 --- a/drivers/media/video/ivtv/ivtv-mailbox.c +++ b/drivers/media/video/ivtv/ivtv-mailbox.c @@ -369,10 +369,11 @@ int ivtv_vapi(struct ivtv *itv, int cmd, int args, ...) } /* This one is for stuff that can't sleep.. irq handlers, etc.. */ -void ivtv_api_get_data(struct ivtv_mailbox_data *mbdata, int mb, u32 data[]) +void ivtv_api_get_data(struct ivtv_mailbox_data *mbdata, int mb, + int argc, u32 data[]) { + volatile u32 __iomem *p = mbdata->mbox[mb].data; int i; - - for (i = 0; i < CX2341X_MBOX_MAX_DATA; i++) - data[i] = readl(&mbdata->mbox[mb].data[i]); + for (i = 0; i < argc; i++, p++) + data[i] = readl(p); } |