Hi Fabio,

On Mon, Nov 19, 2018 at 09:15:24AM -0200, Fabio Estevam wrote:

The following hang is observed on a Hummingboard 2 MicroSOM i2eX iMX6D - rev 1.3 with no eMMC populated on board:

U-Boot SPL 2018.11+gf6206f8587 (Nov 16 2018 - 00:56:34 +0000) Trying to boot from MMC1

U-Boot 2018.11+gf6206f8587 (Nov 16 2018 - 00:56:34 +0000)

CPU: Freescale i.MX6D rev1.5 996 MHz (running at 792 MHz) CPU: Extended Commercial temperature grade (-20C to 105C) at 33C Reset cause: POR Board: MX6 HummingBoard2 DRAM: 1 GiB MMC: FSL_SDHC: 0, FSL_SDHC: 1 Loading Environment from MMC... *** Warning - bad CRC, using default environment

No panel detected: default to HDMI Display: HDMI (1024x768) In: serial Out: serial Err: serial ---> hangs

which is caused by the following infinite loop inside esdhc_send_cmd_common()

while (!(esdhc_read32(&regs->irqstat) & flags)) ;

Instead of looping forever, provide an exit path so that a timeout error can be propagated in the case irqstat does not report any interrupts, which may happen when no eMMC is populated on board.

Reported-by: Ricardo Salveti rsalveti@rsalveti.net Signed-off-by: Fabio Estevam festevam@gmail.com

---

drivers/mmc/fsl_esdhc.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c index 3cdfa7f..7c17b79 100644 --- a/drivers/mmc/fsl_esdhc.c +++ b/drivers/mmc/fsl_esdhc.c @@ -396,6 +396,7 @@ static int esdhc_send_cmd_common(struct fsl_esdhc_priv *priv, struct mmc *mmc, uint irqstat; u32 flags = IRQSTAT_CC | IRQSTAT_CTOE; struct fsl_esdhc *regs = priv->esdhc_regs;

• unsigned long start;

#ifdef CONFIG_SYS_FSL_ERRATUM_ESDHC111 if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION) @@ -453,8 +454,11 @@ static int esdhc_send_cmd_common(struct fsl_esdhc_priv *priv, struct mmc *mmc, flags = IRQSTAT_BRR;

/* Wait for the command to complete */

• while (!(esdhc_read32(&regs->irqstat) & flags))

• ;
  

• start = get_timer(0);
• while (!(esdhc_read32(&regs->irqstat) & flags)) {

• if (get_timer(start) > 1000)
  

• 	return -ETIMEDOUT;
  

Most other error paths in this routine do 'goto out' instead. The code under the 'out' label resets the module.

baruch

• }

  irqstat = esdhc_read32(&regs->irqstat);