From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sascha Hauer Subject: Re: [PATCH v5 05/11] spi: imx: Add support for loopback for ECSPI controllers Date: Mon, 7 Dec 2015 10:27:47 +0100 Message-ID: <20151207092747.GA11966@pengutronix.de> References: <1449334629-4715-1-git-send-email-anton.bondarenko.sama@gmail.com> <1449334629-4715-6-git-send-email-anton.bondarenko.sama@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, b38343-KZfg59tc24xl57MIdRCFDg@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, vladimir_zapolskiy-nmGgyN9QBj3QT0dZR+AlfA@public.gmane.org, jiada_wang-nmGgyN9QBj3QT0dZR+AlfA@public.gmane.org To: Anton Bondarenko Return-path: Content-Disposition: inline In-Reply-To: <1449334629-4715-6-git-send-email-anton.bondarenko.sama-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> Sender: linux-spi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: On Sat, Dec 05, 2015 at 05:57:03PM +0100, Anton Bondarenko wrote: > Support for ECSPI loopback for IMX51, IMX53 and IMX6Q using TEST register. > > Signed-off-by: Mohsin Kazmi > Signed-off-by: Anton Bondarenko > --- > drivers/spi/spi-imx.c | 19 ++++++++++++++++--- > 1 file changed, 16 insertions(+), 3 deletions(-) > > diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c > index 363276d..3525616 100644 > --- a/drivers/spi/spi-imx.c > +++ b/drivers/spi/spi-imx.c > @@ -246,6 +246,9 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, > #define MX51_ECSPI_STAT 0x18 > #define MX51_ECSPI_STAT_RR (1 << 3) > > +#define MX51_ECSPI_TEST 0x20 > +#define MX51_ECSPI_LOOP BIT(31) > + > /* MX51 eCSPI */ > static unsigned int mx51_ecspi_clkdiv(unsigned int fin, unsigned int fspi, > unsigned int *fres) > @@ -316,6 +319,7 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx, > u32 ctrl = MX51_ECSPI_CTRL_ENABLE, cfg = 0, dma = 0; > u32 tx_wml_cfg, rx_wml_cfg, rxt_wml_cfg; > u32 clk = config->speed_hz, delay; > + u32 lpb = 0; > > /* > * The hardware seems to have a race condition when changing modes. The > @@ -356,6 +360,12 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx, > writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL); > writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG); > > + if (config->mode & SPI_LOOP) > + lpb |= MX51_ECSPI_LOOP; > + > + if ((readl(spi_imx->base + MX51_ECSPI_TEST) & MX51_ECSPI_LOOP) != lpb) > + writel(lpb, spi_imx->base + MX51_ECSPI_TEST); > + > /* > * Wait until the changes in the configuration register CONFIGREG > * propagate into the hardware. It takes exactly one tick of the > @@ -1128,6 +1138,9 @@ static int spi_imx_probe(struct platform_device *pdev) > spi_imx = spi_master_get_devdata(master); > spi_imx->bitbang.master = master; > > + spi_imx->devtype_data = of_id ? of_id->data : > + (struct spi_imx_devtype_data *)pdev->id_entry->driver_data; > + > for (i = 0; i < master->num_chipselect; i++) { > int cs_gpio = of_get_named_gpio(np, "cs-gpios", i); > if (!gpio_is_valid(cs_gpio) && mxc_platform_info) > @@ -1154,10 +1167,10 @@ static int spi_imx_probe(struct platform_device *pdev) > spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message; > spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; > > - init_completion(&spi_imx->xfer_done); > + if (is_imx51_ecspi(spi_imx)) > + spi_imx->bitbang.master->mode_bits |= SPI_LOOP; > > - spi_imx->devtype_data = of_id ? of_id->data : > - (struct spi_imx_devtype_data *) pdev->id_entry->driver_data; > + init_completion(&spi_imx->xfer_done); Some unrelated lines are moved in these two hunks. Is this necessary or just some leftover from development? Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html