Hi Robin,
On Sun Aug 7, 2022 at 4:04 PM CEST, Robin Reckmann wrote:
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.
Signed-off-by: Robin Reckmann robin.reckmann@gmail.com
This makes I2C with GPI DMA work on sm6350/sm7725 fairphone-fp4! Thanks for fixing this!
Tested-by: Luca Weiss luca.weiss@fairphone.com
Regards Luca
drivers/i2c/busses/i2c-qcom-geni.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c index 6ac402ea58fb..d3541e94794e 100644 --- a/drivers/i2c/busses/i2c-qcom-geni.c +++ b/drivers/i2c/busses/i2c-qcom-geni.c @@ -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; -- 2.25.1