diff mbox series

mmc: sdhci-cadence: send tune request twice to work around errata

Message ID 20200121094205.6796-1-yamada.masahiro@socionext.com
State Accepted
Commit 54a78cbdbee41e2c4b6691f950c2bacf7a50723f
Headers show
Series mmc: sdhci-cadence: send tune request twice to work around errata | expand

Commit Message

Masahiro Yamada Jan. 21, 2020, 9:42 a.m. UTC
Cadence sent out an errata report to their customers of this IP.
This errata is not so severe, but the tune request should be sent
twice to avoid the potential issue.

Quote from the report:

Problem Summary
---------------
The IP6116 SD/eMMC PHY design has a timing issue on receive data path.
This issue may lead to an incorrect values of read/write pointers of
the synchronization FIFO. Such a situation can happen at the SDR104
and HS200 tuning procedure when the PHY is requested to change a phase
of sampling clock when moving to the next tuning iteration.

Workarounds
-----------
The following are valid workarounds to resolve the issue:

1. In eMMC mode, software sends tune request twice instead of once at
   each iteration. This means that the clock phase is not changed on
   the second request so there is no potential for clock instability.
2. In SD mode, software must not use the hardware tuning and instead
   perform an almost identical procedure to eMMC, using the HRS34 Tune
   Force register.

Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>

---

 drivers/mmc/sdhci-cadence.c | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/drivers/mmc/sdhci-cadence.c b/drivers/mmc/sdhci-cadence.c
index 4736263bf2a6..eb53653435df 100644
--- a/drivers/mmc/sdhci-cadence.c
+++ b/drivers/mmc/sdhci-cadence.c
@@ -170,6 +170,7 @@  static int sdhci_cdns_set_tune_val(struct sdhci_cdns_plat *plat,
 {
 	void __iomem *reg = plat->hrs_addr + SDHCI_CDNS_HRS06;
 	u32 tmp;
+	int i, ret;
 
 	if (WARN_ON(!FIELD_FIT(SDHCI_CDNS_HRS06_TUNE, val)))
 		return -EINVAL;
@@ -177,11 +178,23 @@  static int sdhci_cdns_set_tune_val(struct sdhci_cdns_plat *plat,
 	tmp = readl(reg);
 	tmp &= ~SDHCI_CDNS_HRS06_TUNE;
 	tmp |= FIELD_PREP(SDHCI_CDNS_HRS06_TUNE, val);
-	tmp |= SDHCI_CDNS_HRS06_TUNE_UP;
-	writel(tmp, reg);
 
-	return readl_poll_timeout(reg, tmp, !(tmp & SDHCI_CDNS_HRS06_TUNE_UP),
-				  1);
+	/*
+	 * Workaround for IP errata:
+	 * The IP6116 SD/eMMC PHY design has a timing issue on receive data
+	 * path. Send tune request twice.
+	 */
+	for (i = 0; i < 2; i++) {
+		tmp |= SDHCI_CDNS_HRS06_TUNE_UP;
+		writel(tmp, reg);
+
+		ret = readl_poll_timeout(reg, tmp,
+					 !(tmp & SDHCI_CDNS_HRS06_TUNE_UP), 1);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
 }
 
 static int __maybe_unused sdhci_cdns_execute_tuning(struct udevice *dev,