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[media] saa7164: Improvements for I2C handling 

Workaround oddball I2C issues caused by using newer
SILABS devices.

Signed-off-by: Steven Toth <stoth@kernellabs.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Steven Toth 2015-03-23 15:42:53 -03:00 committed by Mauro Carvalho Chehab
parent 8ed5e4e89c
commit ad90b6b0f1
1 changed files with 10 additions and 1 deletions
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11
drivers/media/pci/saa7164/saa7164-api.c
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@ -1385,7 +1385,8 @@ int saa7164_api_i2c_read(struct saa7164_i2c *bus, u8 addr, u32 reglen, u8 *reg,
* 08... register address
*/
memset(buf, 0, sizeof(buf));
memcpy((buf + 2 * sizeof(u32) + 0), reg, reglen);
if (reg)
memcpy((buf + 2 * sizeof(u32) + 0), reg, reglen);
*((u32 *)(buf + 0 * sizeof(u32))) = reglen;
*((u32 *)(buf + 1 * sizeof(u32))) = datalen;
@ -1473,6 +1474,14 @@ int saa7164_api_i2c_write(struct saa7164_i2c *bus, u8 addr, u32 datalen,
* 04-07 dest bytes to write
* 08... register address
*/
if (datalen == 1) {
/* Workaround for issues with i2c components
* that issue writes with no data. IE: SI2168/2157
* Increase reglen by 1, strobe out an additional byte,
* ignored by SI2168/2157.
*/
datalen++;
}
*((u32 *)(buf + 0 * sizeof(u32))) = reglen;
*((u32 *)(buf + 1 * sizeof(u32))) = datalen - reglen;
memcpy((buf + 2 * sizeof(u32)), data, datalen);