On 11/3/20 6:03 PM, Bough Chen wrote:
-----Original Message----- From: Peng Fan Sent: 2020年11月3日 16:17 To: Jaehoon Chung jh80.chung@samsung.com; Bough Chen haibo.chen@nxp.com; u-boot@lists.denx.de Cc: dl-uboot-imx uboot-imx@nxp.com Subject: RE: [PATCH] mmc: fsl_esdhc_imx: add wait_dat0() support
Subject: Re: [PATCH] mmc: fsl_esdhc_imx: add wait_dat0() support
On 11/2/20 8:17 PM, haibo.chen@nxp.com wrote:
From: Haibo Chen haibo.chen@nxp.com
Add wait_dat0() support, upper layer will use this callback.
Signed-off-by: Haibo Chen haibo.chen@nxp.com
drivers/mmc/fsl_esdhc_imx.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)
diff --git a/drivers/mmc/fsl_esdhc_imx.c b/drivers/mmc/fsl_esdhc_imx.c index 22040c67a8..dc6a6006fa 100644 --- a/drivers/mmc/fsl_esdhc_imx.c +++ b/drivers/mmc/fsl_esdhc_imx.c @@ -1646,6 +1646,28 @@ static int fsl_esdhc_set_enhanced_strobe(struct udevice *dev) } #endif
+static int fsl_esdhc_wait_dat0(struct udevice *dev, int state,
int timeout_us)+{
- int ret = -ETIMEDOUT;
- bool dat0_high;
- bool target_dat0_high = !!state;
- struct fsl_esdhc_priv *priv = dev_get_priv(dev);
- struct fsl_esdhc *regs = priv->esdhc_regs;
- timeout_us = DIV_ROUND_UP(timeout_us, 10); /* check every 10
us. */
- while (timeout_us--) {
dat0_high = !!(esdhc_read32(®s->prsstat) &PRSSTAT_DAT0);
if (dat0_high == target_dat0_high) {ret = 0;break;}- udelay(10);
Fix indent. And can't use wait_for_bit_xx()?
+1, read_poll_timeout or similar should be used here.
Do not use read_poll_timeout here is because the parameter 'state' can be 0 or 1. if use read_poll_timeout, should like this: read_poll_timeout(esdhc_read32, ®s->prsstat, tmp, !!(tmp & PRSSTAT_DAT0) == !!state, 10, timeout_us);> I think the condition is a little bit complicated, not that readable, but if you prefer this, I can do that.
I think it's not complicated. I don't have any objection but you can follow Peng's opinion. :) Best Regards, Jaehoon Chung
Best Regards Haibo Chen
Thanks, Peng.
Best Regards, Jaehoon Chung
- }
- return ret;
+}
static const struct dm_mmc_ops fsl_esdhc_ops = { .get_cd = fsl_esdhc_get_cd, .send_cmd = fsl_esdhc_send_cmd, @@ -1656,6 +1678,7 @@ static const struct dm_mmc_ops
fsl_esdhc_ops =
{
#if CONFIG_IS_ENABLED(MMC_HS400_ES_SUPPORT) .set_enhanced_strobe = fsl_esdhc_set_enhanced_strobe, #endif
- .wait_dat0 = fsl_esdhc_wait_dat0,
}; #endif