From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marek Vasut Date: Wed, 31 Oct 2018 18:16:04 +0100 Subject: [U-Boot] [PATCH 11/13] mmc: tmio: sdhi: Implement waiting for DAT0 line state In-Reply-To: <20181031171606.13561-1-marek.vasut+renesas@gmail.com> References: <20181031171606.13561-1-marek.vasut+renesas@gmail.com> Message-ID: <20181031171606.13561-11-marek.vasut+renesas@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de When the bus switches to 1.8V mode of operation, it is necessary to verify that the card correctly initiated and completed the voltage switch. This is done by reading out the state of DATA0 line. This patch implement support for reading out the state of the DATA0 line, so the MMC core code can correctly switch to 1.8V mode. Signed-off-by: Marek Vasut Cc: Masahiro Yamada --- drivers/mmc/renesas-sdhi.c | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/renesas-sdhi.c b/drivers/mmc/renesas-sdhi.c index 2949c517cb..e6e6fca061 100644 --- a/drivers/mmc/renesas-sdhi.c +++ b/drivers/mmc/renesas-sdhi.c @@ -308,13 +308,38 @@ static int renesas_sdhi_set_ios(struct udevice *dev) return ret; } +#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT) +static int renesas_sdhi_wait_dat0(struct udevice *dev, int state, int timeout) +{ + int ret = -ETIMEDOUT; + bool dat0_high; + bool target_dat0_high = !!state; + struct tmio_sd_priv *priv = dev_get_priv(dev); + + timeout = DIV_ROUND_UP(timeout, 10); /* check every 10 us. */ + while (timeout--) { + dat0_high = !!(tmio_sd_readl(priv, TMIO_SD_INFO2) & TMIO_SD_INFO2_DAT0); + if (dat0_high == target_dat0_high) { + ret = 0; + break; + } + udelay(10); + } + + return ret; +} +#endif + static const struct dm_mmc_ops renesas_sdhi_ops = { .send_cmd = tmio_sd_send_cmd, .set_ios = renesas_sdhi_set_ios, .get_cd = tmio_sd_get_cd, -#if CONFIG_IS_ENABLED(MMC_HS200_SUPPORT) +#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT) || CONFIG_IS_ENABLED(MMC_HS200_SUPPORT) .execute_tuning = renesas_sdhi_execute_tuning, #endif +#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT) + .wait_dat0 = renesas_sdhi_wait_dat0, +#endif }; #define RENESAS_GEN2_QUIRKS TMIO_SD_CAP_RCAR_GEN2 -- 2.18.0