diff options
| author | Jarod Wilson <jarod@redhat.com> | 2011-01-19 18:49:19 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-01-31 12:18:42 -0200 |
| commit | 5766d204ae6c1f54beaef37a18c3c9b5e32c3b16 (patch) | |
| tree | 05858f379d89689bf9245e2a0caccab5dfe949fc /drivers/staging | |
| parent | 7f2a06deaa22104a4cf4c0cc3d7c44c7e3228ef3 (diff) | |
[media] lirc_zilog: z8 on usb doesn't like back-to-back i2c_master_send
Both the HD-PVR and HVR-1950, driven by the hdpvr and pvrusb2 drivers
respectively, have a zilog z8 chip exposed via i2c. These are both
usb-connected devices, and on both of them, back-to-back i2c_master_send
calls that work fine with a z8 on a pci card fail with a -EIO, as the
chip isn't yet ready from the prior command. To cope with that, add a
delay and retry loop where necessary.
Acked-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/lirc/lirc_zilog.c | 32 |
1 files changed, 26 insertions, 6 deletions
diff --git a/drivers/staging/lirc/lirc_zilog.c b/drivers/staging/lirc/lirc_zilog.c index 3fe5f416019..0aad0d7a74a 100644 --- a/drivers/staging/lirc/lirc_zilog.c +++ b/drivers/staging/lirc/lirc_zilog.c @@ -495,7 +495,7 @@ static int send_data_block(struct IR_tx *tx, unsigned char *data_block) /* send boot data to the IR TX device */ static int send_boot_data(struct IR_tx *tx) { - int ret; + int ret, i; unsigned char buf[4]; /* send the boot block */ @@ -503,7 +503,7 @@ static int send_boot_data(struct IR_tx *tx) if (ret != 0) return ret; - /* kick it off? */ + /* Hit the go button to activate the new boot data */ buf[0] = 0x00; buf[1] = 0x20; ret = i2c_master_send(tx->c, buf, 2); @@ -511,7 +511,19 @@ static int send_boot_data(struct IR_tx *tx) zilog_error("i2c_master_send failed with %d\n", ret); return ret < 0 ? ret : -EFAULT; } - ret = i2c_master_send(tx->c, buf, 1); + + /* + * Wait for zilog to settle after hitting go post boot block upload. + * Without this delay, the HD-PVR and HVR-1950 both return an -EIO + * upon attempting to get firmware revision, and tx probe thus fails. + */ + for (i = 0; i < 10; i++) { + ret = i2c_master_send(tx->c, buf, 1); + if (ret == 1) + break; + udelay(100); + } + if (ret != 1) { zilog_error("i2c_master_send failed with %d\n", ret); return ret < 0 ? ret : -EFAULT; @@ -523,8 +535,8 @@ static int send_boot_data(struct IR_tx *tx) zilog_error("i2c_master_recv failed with %d\n", ret); return 0; } - if (buf[0] != 0x80) { - zilog_error("unexpected IR TX response: %02x\n", buf[0]); + if ((buf[0] != 0x80) && (buf[0] != 0xa0)) { + zilog_error("unexpected IR TX init response: %02x\n", buf[0]); return 0; } zilog_notify("Zilog/Hauppauge IR blaster firmware version " @@ -827,7 +839,15 @@ static int send_code(struct IR_tx *tx, unsigned int code, unsigned int key) zilog_error("i2c_master_send failed with %d\n", ret); return ret < 0 ? ret : -EFAULT; } - ret = i2c_master_send(tx->c, buf, 1); + + /* Give the z8 a moment to process data block */ + for (i = 0; i < 10; i++) { + ret = i2c_master_send(tx->c, buf, 1); + if (ret == 1) + break; + udelay(100); + } + if (ret != 1) { zilog_error("i2c_master_send failed with %d\n", ret); return ret < 0 ? ret : -EFAULT; |