linux-kernel - [PATCH v7 RESEND 07/13] spi: imx: fix ERR009165

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Message-Id: <1589218356-17475-8-git-send-email-yibin.gong@nxp.com>
Date:   Tue, 12 May 2020 01:32:30 +0800
From:   Robin Gong <yibin.gong@....com>
To:     s.hauer@...gutronix.de, vkoul@...nel.org, shawnguo@...nel.org,
        u.kleine-koenig@...gutronix.de, robh+dt@...nel.org,
        festevam@...il.com, dan.j.williams@...el.com, mark.rutland@....com,
        catalin.marinas@....com
Cc:     will.deacon@....com, l.stach@...gutronix.de,
        martin.fuzzey@...wbird.group, kernel@...gutronix.de,
        linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-imx@....com,
        dmaengine@...r.kernel.org, devicetree@...r.kernel.org
Subject: [PATCH v7 RESEND 07/13] spi: imx: fix ERR009165

Change to XCH  mode even in dma mode, please refer to the below
errata:
https://www.nxp.com/docs/en/errata/IMX6DQCE.pdf

Signed-off-by: Robin Gong <yibin.gong@....com>
Acked-by: Mark Brown <broonie@...nel.org>
---
 drivers/spi/spi-imx.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index f4f28a4..70df8e6 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -585,8 +585,8 @@ static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx,
 	ctrl |= mx51_ecspi_clkdiv(spi_imx, t->speed_hz, &clk);
 	spi_imx->spi_bus_clk = clk;
 
-	if (spi_imx->usedma)
-		ctrl |= MX51_ECSPI_CTRL_SMC;
+	/* ERR009165: work in XHC mode as PIO */
+	ctrl &= ~MX51_ECSPI_CTRL_SMC;
 
 	writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
 
@@ -617,7 +617,7 @@ static void mx51_setup_wml(struct spi_imx_data *spi_imx)
 	 * and enable DMA request.
 	 */
 	writel(MX51_ECSPI_DMA_RX_WML(spi_imx->wml - 1) |
-		MX51_ECSPI_DMA_TX_WML(spi_imx->wml) |
+		MX51_ECSPI_DMA_TX_WML(0) |
 		MX51_ECSPI_DMA_RXT_WML(spi_imx->wml) |
 		MX51_ECSPI_DMA_TEDEN | MX51_ECSPI_DMA_RXDEN |
 		MX51_ECSPI_DMA_RXTDEN, spi_imx->base + MX51_ECSPI_DMA);
@@ -1171,7 +1171,11 @@ static int spi_imx_dma_configure(struct spi_master *master)
 	tx.direction = DMA_MEM_TO_DEV;
 	tx.dst_addr = spi_imx->base_phys + MXC_CSPITXDATA;
 	tx.dst_addr_width = buswidth;
-	tx.dst_maxburst = spi_imx->wml;
+	/*
+	 * For ERR009165 with tx_wml = 0 could enlarge burst size to fifo size
+	 * to speed up fifo filling as possible.
+	 */
+	tx.dst_maxburst = spi_imx->devtype_data->fifo_size;
 	ret = dmaengine_slave_config(master->dma_tx, &tx);
 	if (ret) {
 		dev_err(spi_imx->dev, "TX dma configuration failed with %d\n", ret);
@@ -1265,10 +1269,6 @@ static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
 {
 	int ret;
 
-	/* use pio mode for i.mx6dl chip TKT238285 */
-	if (of_machine_is_compatible("fsl,imx6dl"))
-		return 0;
-
 	spi_imx->wml = spi_imx->devtype_data->fifo_size / 2;
 
 	/* Prepare for TX DMA: */
-- 
2.7.4