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Commit 185ecd35 authored by Vipin Deep Kaur's avatar Vipin Deep Kaur
Browse files

spi: spi-geni-qcom: Reset the dma engine on failure 



On a DMA transfer timeout failure, reset the TX/RX DMA
engines to avoid any SMMU fault caused as a consequence
of the DMA engine getting restarted and trying to access
the unmapped buffer addresses.

Change-Id: Ic2f637b3a90dc63a27d2b2f53442ac071a56337c
Signed-off-by: default avatarVipin Deep Kaur <vkaur@codeaurora.org>
parent 3423e083

drivers/spi/spi-geni-qcom.c

+22 −4
Original line number Diff line number Diff line
@@ -1108,13 +1108,31 @@ static void handle_fifo_timeout(struct spi_geni_master *mas, 
				"Failed to cancel/abort m_cmd\n");

	}

	if (mas->cur_xfer_mode == SE_DMA) {

		if (xfer->tx_buf)

		if (xfer->tx_buf) {

			reinit_completion(&mas->xfer_done);

			writel_relaxed(1, mas->base +

				SE_DMA_TX_FSM_RST);

			timeout =

			wait_for_completion_timeout(&mas->xfer_done, HZ);

			if (!timeout)

				dev_err(mas->dev,

					"DMA TX RESET failed\n");

			geni_se_tx_dma_unprep(mas->wrapper_dev,

				xfer->tx_dma, xfer->len);

		if (xfer->rx_buf)

		}

		if (xfer->rx_buf) {

			reinit_completion(&mas->xfer_done);

			writel_relaxed(1, mas->base +

				SE_DMA_RX_FSM_RST);

			timeout =

			wait_for_completion_timeout(&mas->xfer_done, HZ);

			if (!timeout)

				dev_err(mas->dev,

					"DMA RX RESET failed\n");

			geni_se_rx_dma_unprep(mas->wrapper_dev,

				xfer->rx_dma, xfer->len);

		}

	}



}