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i2c: fix read-only I2C transfers on STM32F0/F3

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Ensure that we put a proper start bit if the transfer only contains a
read but has the start flag set.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=smaug
BUG=chrome-os-partner:40919
TEST=On Smaug (P6), at the Linux prompt, do
"cat /sys/class/power_supply/bq27742-0/current_now" and see a proper
value rather than an error.

Change-Id: I10cc9907476b3cfb006f2c1540688139366c9195
Reviewed-on: https://chromium-review.googlesource.com/275079
Trybot-Ready: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Puthikorn Voravootivat <puthik@chromium.org>
This commit is contained in:
Vincent Palatin
2015-06-03 15:57:30 -07:00
committed by ChromeOS Commit Bot
parent 7b5c67609f
commit 45f7ddadd1
1 changed files with 1 additions and 1 deletions
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2
chip/stm32/i2c-stm32f0.c
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@@ -421,7 +421,7 @@ int chip_i2c_xfer(int port, int slave_addr, const uint8_t *out, int out_bytes,
| STM32_I2C_CR2_RD_WRN | slave_addr
| (xfer_stop ? STM32_I2C_CR2_AUTOEND : 0)
| (!xfer_stop ? STM32_I2C_CR2_RELOAD : 0)
| (out_bytes ? STM32_I2C_CR2_START : 0);
| (out_bytes || xfer_start ? STM32_I2C_CR2_START : 0);
for (i = 0; i < in_bytes; i++) {
/* Wait for receive buffer not empty */