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| author | Andy Walls <awalls@radix.net> | 2008-09-28 20:46:02 -0400 |
|---|---|---|
| committer | Andy Walls <awalls@radix.net> | 2008-09-28 20:46:02 -0400 |
| commit | ac5d49924a0ab6a492457817a7a08d952961ab67 (patch) | |
| tree | cbb2d4779304eb8fd23de78809779bdafb0ebb56 /linux/drivers/media/video/cx18/cx18-av-core.c | |
| parent | c20af2106a755d11b45e19ade56a98fa8bf6ca29 (diff) | |
| download | mediapointer-dvb-s2-ac5d49924a0ab6a492457817a7a08d952961ab67.tar.gz mediapointer-dvb-s2-ac5d49924a0ab6a492457817a7a08d952961ab67.tar.bz2 | |
cx18: Add default behavior of checking and retrying PCI MMIO accesses
From: Andy Walls <awalls@radix.net>
cx18: Add default behavior of checking and retrying PCI MMIO accesses.
The concept of checking and retrying PCI MMIO accesses for better reliability
in older motherboards was suggested by Steve Toth <stoth@linuxtv.org>. This
change implements MMIO retries and the retry_mmio module parameter that is
enabled by default. Limited experiments have shown this is more reliable than
the mmio_ndelay parameter. mmio_ndelay has insignificant effect with retries
enabled.
Priority: high
Signed-off-by: Andy Walls <awalls@radix.net>
Diffstat (limited to 'linux/drivers/media/video/cx18/cx18-av-core.c')
| -rw-r--r-- | linux/drivers/media/video/cx18/cx18-av-core.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/linux/drivers/media/video/cx18/cx18-av-core.c b/linux/drivers/media/video/cx18/cx18-av-core.c index d8626e354..73f5141a4 100644 --- a/linux/drivers/media/video/cx18/cx18-av-core.c +++ b/linux/drivers/media/video/cx18/cx18-av-core.c @@ -42,6 +42,12 @@ int cx18_av_write4(struct cx18 *cx, u16 addr, u32 value) return 0; } +int cx18_av_write4_noretry(struct cx18 *cx, u16 addr, u32 value) +{ + cx18_write_reg_noretry(cx, value, 0xc40000 + addr); + return 0; +} + u8 cx18_av_read(struct cx18 *cx, u16 addr) { u32 x = cx18_read_reg(cx, 0xc40000 + (addr & ~3)); @@ -55,6 +61,11 @@ u32 cx18_av_read4(struct cx18 *cx, u16 addr) return cx18_read_reg(cx, 0xc40000 + addr); } +u32 cx18_av_read4_noretry(struct cx18 *cx, u16 addr) +{ + return cx18_read_reg_noretry(cx, 0xc40000 + addr); +} + int cx18_av_and_or(struct cx18 *cx, u16 addr, unsigned and_mask, u8 or_value) { |