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Commit f2f4b1e7 authored by Rama Krishna Phani A's avatar Rama Krishna Phani A
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spi: spi-geni-qcom: Add support to disable dma mode for SPI transfers 



QUPv3 controller supports different modes of data transfers for SPI.
Add support to choose only fifo mode for data transfers.

Change-Id: I39cd7e2e1a886d3e1ef6a4516e07293af71deef4
Signed-off-by: default avatarRama Krishna Phani A <rphani@codeaurora.org>
parent 5278bae1

Documentation/devicetree/bindings/spi/qcom,spi-geni-qcom.txt

+4 −0
Original line number Diff line number Diff line
@@ -47,6 +47,10 @@ Optional properties: 


- qcom,slv-ctrl : Set this flag to configure QUPV3 as SPI slave controller.



- qcom,disable-dma : Set this flag to ensure only fifo mode is used for

			transfers. FIFO mode does not work when FW of SE

			is configured in GSI mode.



Other optional properties described in

Documentation/devicetree/bindings/spi/spi-bus.txt

drivers/spi/spi-geni-qcom.c

+28 −11
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.

 * Copyright (c) 2017-2019, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -152,6 +152,7 @@ struct spi_geni_master { 
	struct completion tx_cb;

	struct completion rx_cb;

	bool qn_err;

	bool disable_dma_mode;

	int cur_xfer_mode;

	int num_tx_eot;

	int num_rx_eot;
@@ -1063,17 +1064,30 @@ static void setup_fifo_xfer(struct spi_transfer *xfer, 
		mas->rx_rem_bytes = xfer->len;

	}



	fifo_size =

		(mas->tx_fifo_depth * mas->tx_fifo_width / mas->cur_word_len);

	/*

	 * Controller has support to transfer data either in FIFO mode

	 * or in SE_DMA mode. Either force the controller to choose FIFO

	 * mode for transfers or select the mode dynamically based on

	 * size of data.

	 */

	if (mas->disable_dma_mode) {

		mas->cur_xfer_mode = FIFO_MODE;

		geni_se_select_mode(mas->base, mas->cur_xfer_mode);

	} else {

		fifo_size = (mas->tx_fifo_depth *

				mas->tx_fifo_width / mas->cur_word_len);

		if (trans_len > fifo_size) {

			if (mas->cur_xfer_mode != SE_DMA) {

				mas->cur_xfer_mode = SE_DMA;

			geni_se_select_mode(mas->base, mas->cur_xfer_mode);

				geni_se_select_mode(mas->base,

						mas->cur_xfer_mode);

			}

		} else {

			if (mas->cur_xfer_mode != FIFO_MODE) {

				mas->cur_xfer_mode = FIFO_MODE;

			geni_se_select_mode(mas->base, mas->cur_xfer_mode);

				geni_se_select_mode(mas->base,

						mas->cur_xfer_mode);

			}

		}

	}
@@ -1580,6 +1594,9 @@ static int spi_geni_probe(struct platform_device *pdev) 
		spi->slave_abort = spi_slv_abort;

	}



	geni_mas->disable_dma_mode = of_property_read_bool(pdev->dev.of_node,

			"qcom,disable-dma");



	spi->mode_bits = (SPI_CPOL | SPI_CPHA | SPI_LOOP | SPI_CS_HIGH);

	spi->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);

	spi->num_chipselect = SPI_NUM_CHIPSELECT;