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authorAndy Walls <awalls@radix.net>2010-02-10 15:34:46 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2010-02-26 15:11:07 -0300
commit587808d5f59e842f9258a15e88ad530fcf6e6763 (patch)
tree07252eaff987faf5ad1b6256d520c13ab90e4554 /drivers/media/video/ivtv/ivtv-mailbox.c
parent00cb9f6920aaeb34bcef146085ae57e363641a85 (diff)
downloadlinux-587808d5f59e842f9258a15e88ad530fcf6e6763.tar.bz2
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.c9
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 1b5c0ac09a85..84577f6f41a2 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);
}