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i2c: qcom-geni: Fix GPI DMA buffer sync-back

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commit 8689b80b22dbf1f5e993233370fe57f08731b14d upstream.

Fix i2c transfers using GPI DMA mode for all message types that do not set
the I2C_M_DMA_SAFE flag (e.g. SMBus "read byte").

In this case a bounce buffer is returned by i2c_get_dma_safe_msg_buf(),
and it has to synced back to the message after the transfer is done.

Add missing assignment of dma buffer in geni_i2c_gpi().

Set xferred in i2c_put_dma_safe_msg_buf() to true in case of no error to
ensure the sync-back of this dma buffer to the message.

Fixes: d8703554f4de ("i2c: qcom-geni: Add support for GPI DMA")
Signed-off-by: Robin Reckmann <robin.reckmann@gmail.com>
Tested-by: Luca Weiss <luca.weiss@fairphone.com>
Tested-by: Caleb Connolly <caleb@connolly.tech>
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Robin Reckmann 2022-08-07 23:04:54 +09:00 committed by Greg Kroah-Hartman
parent 7dfea65b00
commit 8f89e5c8da
1 changed files with 3 additions and 2 deletions
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5
drivers/i2c/busses/i2c-qcom-geni.c
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@ -484,12 +484,12 @@ static void geni_i2c_gpi_unmap(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
{
if (tx_buf) {
dma_unmap_single(gi2c->se.dev->parent, tx_addr, msg->len, DMA_TO_DEVICE);
i2c_put_dma_safe_msg_buf(tx_buf, msg, false);
i2c_put_dma_safe_msg_buf(tx_buf, msg, !gi2c->err);
}
if (rx_buf) {
dma_unmap_single(gi2c->se.dev->parent, rx_addr, msg->len, DMA_FROM_DEVICE);
i2c_put_dma_safe_msg_buf(rx_buf, msg, false);
i2c_put_dma_safe_msg_buf(rx_buf, msg, !gi2c->err);
}
}
@ -553,6 +553,7 @@ static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
desc->callback_param = gi2c;
dmaengine_submit(desc);
*buf = dma_buf;
*dma_addr_p = addr;
return 0;