From ee02543561d4d776b15ad1ad2f6430b361414102 Mon Sep 17 00:00:00 2001 From: Stephen Carlson Date: Tue, 17 Aug 2021 12:46:40 -0700 Subject: [PATCH] drivers: mmc: Add wait_dat0 support for Freescale eSDHC driver Adds an implementation of the wait_dat0 MMC operation for the Freescale eSHDC driver, allowing the driver to continue when the card is ready rather than waiting for the worst case time on each MMC switch operation. Signed-off-by: Stephen Carlson Reviewed-by: Jaehoon Chung Signed-off-by: Jaehoon Chung --- drivers/mmc/fsl_esdhc.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c index ebb307e950..05a6d0ce15 100644 --- a/drivers/mmc/fsl_esdhc.c +++ b/drivers/mmc/fsl_esdhc.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include @@ -1138,6 +1139,20 @@ int fsl_esdhc_hs400_prepare_ddr(struct udevice *dev) return 0; } +static int fsl_esdhc_wait_dat0(struct udevice *dev, int state, + int timeout_us) +{ + int ret; + u32 tmp; + struct fsl_esdhc_priv *priv = dev_get_priv(dev); + struct fsl_esdhc *regs = priv->esdhc_regs; + + ret = readx_poll_timeout(esdhc_read32, ®s->prsstat, tmp, + !!(tmp & PRSSTAT_DAT0) == !!state, + timeout_us); + return ret; +} + static const struct dm_mmc_ops fsl_esdhc_ops = { .get_cd = fsl_esdhc_get_cd, .send_cmd = fsl_esdhc_send_cmd, @@ -1147,6 +1162,7 @@ static const struct dm_mmc_ops fsl_esdhc_ops = { #endif .reinit = fsl_esdhc_reinit, .hs400_prepare_ddr = fsl_esdhc_hs400_prepare_ddr, + .wait_dat0 = fsl_esdhc_wait_dat0, }; static const struct udevice_id fsl_esdhc_ids[] = { -- 2.39.5