From patchwork Thu Dec 22 09:56:35 2011
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Subject: [U-Boot] OMAP MMC: Add delay before waiting for status
Date: Wed, 21 Dec 2011 23:56:35 -0000
From: =?utf-8?q?Andreas_M=C3=BCller_=3Cschnitzeltony=40gmx=2Ede=3E?=
X-Patchwork-Id: 132795
Message-Id: <1324547795-19678-1-git-send-email-schnitzeltony@gmx.de>
To: u-boot@lists.denx.de

Loading kernel from MMC created the following error message reproducable:

| reading uImage
| mmc_send_cmd: timedout waiting for stat!
|
| 2860468 bytes read

Tested on overo with OMAP3530:
* OMAP3530-GP ES3.1, CPU-OPP2, L3-165MHz, Max CPU Clock 720 mHz
  Die ID #470e000400000000040398d31402100c
* OMAP3530-GP ES3.1, CPU-OPP2, L3-165MHz, Max CPU Clock 600 mHz
  Die ID #112000040000000004035c140101b011

Signed-off-by: Andreas Müller <schnitzeltony@gmx.de>

---
drivers/mmc/omap_hsmmc.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/omap_hsmmc.c b/drivers/mmc/omap_hsmmc.c
index c38b9e6..ac91e5d 100644
--- a/drivers/mmc/omap_hsmmc.c
+++ b/drivers/mmc/omap_hsmmc.c
@@ -197,6 +197,10 @@ static int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
 	unsigned int flags, mmc_stat;
 	ulong start;
 
+	/* Delay added before checking the status */
+	if (cmd->cmdidx == MMC_CMD_SEND_STATUS)
+		udelay(1); /* wait 1 us */
+
 	start = get_timer(0);
 	while ((readl(&mmc_base->pstate) & DATI_MASK) == DATI_CMDDIS) {
 		if (get_timer(0) - start > MAX_RETRY_MS) {
