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| author | Wesley Post <pa4wdh@xs4all.nl> | 2016-02-29 21:39:10 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2016-03-01 16:40:14 +0300 |
| commit | f7c7ac480d246f2f625a70f56ea6650710c23f30 (patch) | |
| tree | f9c01e88c7c267edc465b471f5ae79df7d03ac8f /drivers/media/usb/gspca/ov519.c | |
| parent | 5c915c68763889f0183a1cc61c84bb228b60124a (diff) | |
| download | linux-f7c7ac480d246f2f625a70f56ea6650710c23f30.tar.xz | |
[media] gspca: Fix ov519 i2c r/w not working when connected to a xhci host
Fix the ov519 driver not working (unable to talk to the sensor) when
plugged into a xhci host. The root cause here is that uhci/ohci/ehci
hosts typically will send any pending async requests every milli-second
and then go to sleep for the rest if the milli-second, where as xhci hosts
send them immediately, causing things to go too fast for the ov519 bridge.
This commit adds a few delays fixing this.
Signed-off-by: Wesley Post <pa4wdh@xs4all.nl>
[hdegoede@redhat.com: Also add delays to w996Xcf.c, as that needs them too]
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media/usb/gspca/ov519.c')
| -rw-r--r-- | drivers/media/usb/gspca/ov519.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/media/usb/gspca/ov519.c b/drivers/media/usb/gspca/ov519.c index c95f32a0c02b..eb668e71a5e8 100644 --- a/drivers/media/usb/gspca/ov519.c +++ b/drivers/media/usb/gspca/ov519.c @@ -2042,6 +2042,9 @@ static void reg_w(struct sd *sd, u16 index, u16 value) if (sd->gspca_dev.usb_err < 0) return; + /* Avoid things going to fast for the bridge with a xhci host */ + udelay(150); + switch (sd->bridge) { case BRIDGE_OV511: case BRIDGE_OV511PLUS: @@ -2103,6 +2106,8 @@ static int reg_r(struct sd *sd, u16 index) req = 1; } + /* Avoid things going to fast for the bridge with a xhci host */ + udelay(150); ret = usb_control_msg(sd->gspca_dev.dev, usb_rcvctrlpipe(sd->gspca_dev.dev, 0), req, @@ -2131,6 +2136,8 @@ static int reg_r8(struct sd *sd, if (sd->gspca_dev.usb_err < 0) return -1; + /* Avoid things going to fast for the bridge with a xhci host */ + udelay(150); ret = usb_control_msg(sd->gspca_dev.dev, usb_rcvctrlpipe(sd->gspca_dev.dev, 0), 1, /* REQ_IO */ @@ -2187,6 +2194,8 @@ static void ov518_reg_w32(struct sd *sd, u16 index, u32 value, int n) *((__le32 *) sd->gspca_dev.usb_buf) = __cpu_to_le32(value); + /* Avoid things going to fast for the bridge with a xhci host */ + udelay(150); ret = usb_control_msg(sd->gspca_dev.dev, usb_sndctrlpipe(sd->gspca_dev.dev, 0), 1 /* REG_IO */, |