| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame] | 1 | From: Russell King <rmk+kernel@armlinux.org.uk> |
| 2 | Bcc: linux@mail.armlinux.org.uk |
| 3 | Subject: [PATCH 6/7] i2c: pxa: use master-abort for device probes |
| 4 | MIME-Version: 1.0 |
| 5 | Content-Disposition: inline |
| 6 | Content-Transfer-Encoding: 8bit |
| 7 | Content-Type: text/plain; charset="utf-8" |
| 8 | |
| 9 | Use master-abort to send the stop condition after an address cycle |
| 10 | rather than resetting the controller. |
| 11 | |
| 12 | Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> |
| 13 | --- |
| 14 | drivers/i2c/busses/i2c-pxa.c | 10 ++-------- |
| 15 | 1 file changed, 2 insertions(+), 8 deletions(-) |
| 16 | |
| 17 | --- a/drivers/i2c/busses/i2c-pxa.c |
| 18 | +++ b/drivers/i2c/busses/i2c-pxa.c |
| 19 | @@ -899,14 +899,8 @@ static void i2c_pxa_irq_txempty(struct p |
| 20 | icr &= ~ICR_ALDIE; |
| 21 | icr |= ICR_START | ICR_TB; |
| 22 | } else { |
| 23 | - if (i2c->msg->len == 0) { |
| 24 | - /* |
| 25 | - * Device probes have a message length of zero |
| 26 | - * and need the bus to be reset before it can |
| 27 | - * be used again. |
| 28 | - */ |
| 29 | - i2c_pxa_reset(i2c); |
| 30 | - } |
| 31 | + if (i2c->msg->len == 0) |
| 32 | + icr |= ICR_MA; |
| 33 | i2c_pxa_master_complete(i2c, 0); |
| 34 | } |
| 35 | |