ERR009165 fixed on i.mx6ul/6ull/6sll. All other i.mx6/7 and i.mx8m/8mm still need this errata. Please refer to nxp official errata document from https://www.nxp.com/ . For removing workaround on those chips. Add new i.mx6ul type. Signed-off-by: Robin Gong <yibin.gong@xxxxxxx> Acked-by: Mark Brown <broonie@xxxxxxxxxx> --- drivers/spi/spi-imx.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 54 insertions(+), 5 deletions(-) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index f82d63f..9067c95 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; @@ -76,6 +77,11 @@ struct spi_imx_devtype_data { bool has_slavemode; unsigned int fifo_size; bool dynamic_burst; + /* + * ERR009165 fixed or not: + * https://www.nxp.com/docs/en/errata/IMX6DQCE.pdf + */ + bool tx_glitch_fixed; enum spi_imx_devtype devtype; }; @@ -132,6 +138,11 @@ static inline int is_imx51_ecspi(struct spi_imx_data *d) return d->devtype_data->devtype == IMX51_ECSPI; } +static inline int is_imx6ul_ecspi(struct spi_imx_data *d) +{ + return d->devtype_data->devtype == IMX6UL_ECSPI; +} + static inline int is_imx53_ecspi(struct spi_imx_data *d) { return d->devtype_data->devtype == IMX53_ECSPI; @@ -591,8 +602,14 @@ 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 */ - 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 && spi_imx->devtype_data->tx_glitch_fixed) + ctrl |= MX51_ECSPI_CTRL_SMC; + else + ctrl &= ~MX51_ECSPI_CTRL_SMC; writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL); @@ -618,12 +635,16 @@ static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx, static void mx51_setup_wml(struct spi_imx_data *spi_imx) { + u32 tx_wml = 0; + + if (spi_imx->devtype_data->tx_glitch_fixed) + tx_wml = spi_imx->wml; /* * Configure the DMA register: setup the watermark * and enable DMA request. */ writel(MX51_ECSPI_DMA_RX_WML(spi_imx->wml - 1) | - MX51_ECSPI_DMA_TX_WML(0) | + MX51_ECSPI_DMA_TX_WML(tx_wml) | 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); @@ -1017,6 +1038,23 @@ 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, + .tx_glitch_fixed = true, + .disable = mx51_ecspi_disable, + .devtype = IMX6UL_ECSPI, +}; + static const struct platform_device_id spi_imx_devtype[] = { { .name = "imx1-cspi", @@ -1040,6 +1078,9 @@ 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 */ } }; @@ -1052,6 +1093,7 @@ 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); @@ -1179,7 +1221,14 @@ 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_THRESHOLD=0 could enlarge burst size to fifo + * size to speed up fifo filling as possible. + */ + if (spi_imx->devtype_data->tx_glitch_fixed) + tx.dst_maxburst = spi_imx->wml; + else + 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); @@ -1690,7 +1739,7 @@ static int spi_imx_probe(struct platform_device *pdev) spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH \ | SPI_NO_CS; if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx) || - is_imx53_ecspi(spi_imx)) + is_imx53_ecspi(spi_imx) || is_imx6ul_ecspi(spi_imx)) spi_imx->bitbang.master->mode_bits |= SPI_LOOP | SPI_READY; spi_imx->spi_drctl = spi_drctl; -- 2.7.4
