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V4L/DVB (7610): em28xx: Select reg wait time based on chip ID 

This is more conservative than just removing the msleep() from
em28xx_write_regs_req(), since some old hardware may still need it.
So, it will remove the sleep time only for those chips where this
removal were tested.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Mauro Carvalho Chehab 2008-04-17 21:42:14 -03:00
parent 7640ea9933
commit 89b329ef9d
4 changed files with 20 additions and 4 deletions
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14
drivers/media/video/em28xx/em28xx-cards.c
View File

@ -525,6 +525,20 @@ static void em28xx_set_model(struct em28xx *dev)
*/
void em28xx_pre_card_setup(struct em28xx *dev)
{
int rc;
dev->wait_after_write = 5;
rc = em28xx_read_reg(dev, CHIPID_REG);
if (rc > 0) {
switch (rc) {
case 36:
em28xx_info("chip ID is em2882/em2883\n");
dev->wait_after_write = 0;
break;
default:
em28xx_info("em28xx chip ID = %d\n", rc);
}
}
em28xx_set_model(dev);
/* request some modules */

3
drivers/media/video/em28xx/em28xx-core.c
View File

@ -153,6 +153,9 @@ int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), req,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0x0000, reg, bufs, len, HZ);
if (dev->wait_after_write)
msleep(dev->wait_after_write);
kfree(bufs);
return ret;
}

4
drivers/media/video/em28xx/em28xx-video.c
View File

@ -1927,10 +1927,6 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
dev->em28xx_read_reg_req = em28xx_read_reg_req;
dev->is_em2800 = em28xx_boards[dev->model].is_em2800;
errCode = em28xx_read_reg(dev, CHIPID_REG);
if (errCode >= 0)
em28xx_info("em28xx chip ID = %d\n", errCode);
em28xx_pre_card_setup(dev);
errCode = em28xx_config(dev);

3
drivers/media/video/em28xx/em28xx.h
View File

@ -331,6 +331,9 @@ struct em28xx {
unsigned int max_range_640_480:1;
unsigned int has_dvb:1;
/* Some older em28xx chips needs a waiting time after writing */
unsigned int wait_after_write;
/* GPIO sequences for tuner callback */
struct em28xx_reg_seq *analog_gpio, *digital_gpio;