diff options
| author | Andy Walls <awalls@radix.net> | 2008-09-01 05:40:41 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2008-10-12 13:36:58 +0200 |
| commit | c641d09c60bfa36c7cf70444f24265090e51f5ce (patch) | |
| tree | 2f3a9cc7d86aed3e0d5f1c7631a7354bb490fb29 /drivers/media/video/cx18/cx18-driver.h | |
| parent | V4L/DVB (8913): cx18: Create cx18_ specific wrappers for all pci mmio accesse... (diff) | |
| download | linux-c641d09c60bfa36c7cf70444f24265090e51f5ce.tar.xz linux-c641d09c60bfa36c7cf70444f24265090e51f5ce.zip | |
V4L/DVB (8914): cx18: Throttle mmio to/from the CX23418 so boards work in older systems
cx18: Throttle mmio to/from the CX23418 so boards work in older systems. The
CX23418 couldn't reliably handle mmio at the rate at which the cx18 driver was
attempting to access the chip. The PCI bridge arrangements and settings on
modern motherboards still allowed the CX23418 to work OK, but it didn't work
well on many older motherboards: mysterious I2C errors, firmware loading errors,
etc. This patch adds a throttle to *all* mmio access to the CX23418. It
defaults to a delay of 31 ns, but is adjustable by the mmio_ndelay module parm.
My HVR-1600 and Raptor PAL/SECAM card now function for analog capture on a
motherboard with an Intel 82810E Northbridge and 82801AA Southbridge.
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/cx18/cx18-driver.h')
| -rw-r--r-- | drivers/media/video/cx18/cx18-driver.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/media/video/cx18/cx18-driver.h b/drivers/media/video/cx18/cx18-driver.h index 2cfdbe445820..cc6f288a6da8 100644 --- a/drivers/media/video/cx18/cx18-driver.h +++ b/drivers/media/video/cx18/cx18-driver.h @@ -63,6 +63,9 @@ # error "This driver requires kernel PCI support." #endif +/* Default delay to throttle mmio access to the CX23418 so it doesn't choke */ +#define CX18_DEFAULT_MMIO_NDELAY 31 /* 30.3 ns = 1 PCI clock(s) / 33 MHz */ + #define CX18_MEM_OFFSET 0x00000000 #define CX18_MEM_SIZE 0x04000000 #define CX18_REG_OFFSET 0x02000000 @@ -176,6 +179,7 @@ struct cx18_options { int cardtype; /* force card type on load */ int tuner; /* set tuner on load */ int radio; /* enable/disable radio */ + unsigned long mmio_ndelay; /* delay in ns after every PCI mmio access */ }; /* per-buffer bit flags */ |