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| author | Mauro Carvalho Chehab <mchehab@infradead.org> | 2006-09-06 19:04:28 -0300 |
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| committer | Mauro Carvalho Chehab <mchehab@infradead.org> | 2006-09-06 19:04:28 -0300 |
| commit | 73417c50a08d93d5c209df8a49c8d0a0e0d0dc8b (patch) | |
| tree | 74414bebe3d0e21fb3e0d00b183d74cf876c5e0c /README.HG | |
| parent | 9f9d0d9c21ed8c31ec1672eeb262502af5b1e326 (diff) | |
| download | mediapointer-dvb-s2-73417c50a08d93d5c209df8a49c8d0a0e0d0dc8b.tar.gz mediapointer-dvb-s2-73417c50a08d93d5c209df8a49c8d0a0e0d0dc8b.tar.bz2 | |
Improved i2c performance on software bitbang algoritm
From: Mauro Carvalho Chehab <mchehab@infradead.org>
Software I2C were using a very conservative value of udelay=16, meaning about
20Kbps. According with Philips I2C datasheet, the i2c should answer well for
times at the order of 4.7 us. So, using udelay=5 should work for all devices.
After this patch, the speed should be close to 66,67 Kbps, with the current
kernel software bitbang, with 30/60 duty cycle.
Anyway, added a new parameter (i2c_udelay) that would allow using conservative
values, if eventually a hardware doesn't support the datasheet values.
Thanks to Jean Delvare <khali@linux-fr.org> for pointing this improvement.
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
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