linux-kernel - [PATCH v1 07/15] spi: imx: remove ERR009165 workaround on i.mx6ul

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Date:   Tue, 23 Apr 2019 13:51:10 +0000
From:   Robin Gong <yibin.gong@....com>
To:     "broonie@...nel.org" <broonie@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
        "plyatov@...il.com" <plyatov@...il.com>,
        "sean.nyekjaer@...vas.dk" <sean.nyekjaer@...vas.dk>
CC:     dl-linux-imx <linux-imx@....com>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>
Subject: [PATCH v1 07/15] spi: imx: remove ERR009165 workaround on i.mx6ul

   ERR009165 fix on i.mx6ul and next chip, such as i.mx6ull/i.mx8mq/i.mx8mm.
Remove workaround on those chips. Add new i.mx6ul type for that.

Signed-off-by: Robin Gong <yibin.gong@....com>
---
 drivers/spi/spi-imx.c | 39 +++++++++++++++++++++++++++++++++++----
 1 file changed, 35 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index eb56eac..2e5e978 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -57,6 +57,7 @@ enum spi_imx_devtype {
 	IMX35_CSPI,	/* CSPI on all i.mx except above */
 	IMX51_ECSPI,	/* ECSPI on i.mx51 */
 	IMX53_ECSPI,	/* ECSPI on i.mx53 and later */
+	IMX6UL_ECSPI,	/* ERR009165 fix from i.mx6ul */
 };
 
 struct spi_imx_data;
@@ -128,7 +129,8 @@ static inline int is_imx35_cspi(struct spi_imx_data *d)
 
 static inline int is_imx51_ecspi(struct spi_imx_data *d)
 {
-	return d->devtype_data->devtype == IMX51_ECSPI;
+	return d->devtype_data->devtype == IMX51_ECSPI ||
+	       d->devtype_data->devtype == IMX6UL_ECSPI;
 }
 
 static inline int is_imx53_ecspi(struct spi_imx_data *d)
@@ -585,9 +587,16 @@ 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;
 
-	/* ERR009165: work in XHC mode as PIO */
-	if (spi_imx->usedma)
-		ctrl &= ~MX51_ECSPI_CTRL_SMC;
+	/*
+	 * ERR009165: work in XHC mode instead of SMC as PIO on the chips
+	 * before i.mx6ul.
+	 */
+	if (spi_imx->usedma) {
+		if (spi_imx->devtype_data->devtype == IMX6UL_ECSPI)
+			ctrl |= MX51_ECSPI_CTRL_SMC;
+		else
+			ctrl &= ~MX51_ECSPI_CTRL_SMC;
+	}
 
 	writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
 
@@ -615,6 +624,8 @@ static void mx51_setup_wml(struct spi_imx_data *spi_imx)
 {
 	u32 tx_wml = 0;
 
+	if (spi_imx->devtype_data->devtype == IMX6UL_ECSPI)
+		tx_wml = spi_imx->wml;
 	/*
 	 * Configure the DMA register: setup the watermark
 	 * and enable DMA request.
@@ -1012,6 +1023,22 @@ static struct spi_imx_devtype_data imx53_ecspi_devtype_data = {
 	.devtype = IMX53_ECSPI,
 };
 
+static struct spi_imx_devtype_data imx6ul_ecspi_devtype_data = {
+	.intctrl = mx51_ecspi_intctrl,
+	.prepare_message = mx51_ecspi_prepare_message,
+	.prepare_transfer = mx51_ecspi_prepare_transfer,
+	.trigger = mx51_ecspi_trigger,
+	.rx_available = mx51_ecspi_rx_available,
+	.reset = mx51_ecspi_reset,
+	.setup_wml = mx51_setup_wml,
+	.fifo_size = 64,
+	.has_dmamode = true,
+	.dynamic_burst = true,
+	.has_slavemode = true,
+	.disable = mx51_ecspi_disable,
+	.devtype = IMX6UL_ECSPI,
+};
+
 static const struct platform_device_id spi_imx_devtype[] = {
 	{
 		.name = "imx1-cspi",
@@ -1035,6 +1062,9 @@ static const struct platform_device_id spi_imx_devtype[] = {
 		.name = "imx53-ecspi",
 		.driver_data = (kernel_ulong_t) &imx53_ecspi_devtype_data,
 	}, {
+		.name = "imx6ul-ecspi",
+		.driver_data = (kernel_ulong_t) &imx6ul_ecspi_devtype_data,
+	}, {
 		/* sentinel */
 	}
 };
@@ -1047,6 +1077,7 @@ static const struct of_device_id spi_imx_dt_ids[] = {
 	{ .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, },
 	{ .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, },
 	{ .compatible = "fsl,imx53-ecspi", .data = &imx53_ecspi_devtype_data, },
+	{ .compatible = "fsl,imx6ul-ecspi", .data = &imx6ul_ecspi_devtype_data, },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, spi_imx_dt_ids);
-- 
2.7.4