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i2c: sh_mobile: terminate DMA reads properly

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DMA read requests could miss proper termination, so two more bytes would
have been read via PIO overwriting the end of the buffer with wrong
data. Make DMA stop handling more readable while we are here.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang 2015-01-29 18:33:16 +01:00 committed by Wolfram Sang
parent d5fd120e78
commit 32e224090f
1 changed files with 11 additions and 1 deletions
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12
drivers/i2c/busses/i2c-sh_mobile.c
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@ -139,6 +139,7 @@ struct sh_mobile_i2c_data {
int pos;
int sr;
bool send_stop;
bool stop_after_dma;
struct resource *res;
struct dma_chan *dma_tx;
@ -407,7 +408,7 @@ static int sh_mobile_i2c_isr_tx(struct sh_mobile_i2c_data *pd)
if (pd->pos == pd->msg->len) {
/* Send stop if we haven't yet (DMA case) */
if (pd->send_stop && (iic_rd(pd, ICCR) & ICCR_BBSY))
if (pd->send_stop && pd->stop_after_dma)
i2c_op(pd, OP_TX_STOP, 0);
return 1;
}
@ -449,6 +450,13 @@ static int sh_mobile_i2c_isr_rx(struct sh_mobile_i2c_data *pd)
real_pos = pd->pos - 2;
if (pd->pos == pd->msg->len) {
if (pd->stop_after_dma) {
/* Simulate PIO end condition after DMA transfer */
i2c_op(pd, OP_RX_STOP, 0);
pd->pos++;
break;
}
if (real_pos < 0) {
i2c_op(pd, OP_RX_STOP, 0);
break;
@ -536,6 +544,7 @@ static void sh_mobile_i2c_dma_callback(void *data)
sh_mobile_i2c_dma_unmap(pd);
pd->pos = pd->msg->len;
pd->stop_after_dma = true;
iic_set_clr(pd, ICIC, 0, ICIC_TDMAE | ICIC_RDMAE);
}
@ -726,6 +735,7 @@ static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter,
bool do_start = pd->send_stop || !i;
msg = &msgs[i];
pd->send_stop = i == num - 1 || msg->flags & I2C_M_STOP;
pd->stop_after_dma = false;
err = start_ch(pd, msg, do_start);
if (err)