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From e2a5bba97cd6e42b2b631bd17012aa26ffdb5f67 Mon Sep 17 00:00:00 2001
From: Yunhui Cui <yunhui.cui@nxp.com>
Date: Tue, 12 Jul 2016 10:30:08 +0800
Subject: [PATCH 71/93] driver: fsl_qspi: disable AHB buffer prefetch
Errata: A-009282: QuadSPI data pre-fetch can result in incorrect data
When we enable the CONFIG_SYS_FSL_QSPI_AHB, we need this errata workaround.
Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
---
drivers/spi/fsl_qspi.c | 12 +++++++++++-
include/configs/ls1012a_common.h | 1 +
2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/fsl_qspi.c b/drivers/spi/fsl_qspi.c
index 09759fa..f1c87f5 100644
--- a/drivers/spi/fsl_qspi.c
+++ b/drivers/spi/fsl_qspi.c
@@ -441,13 +441,23 @@ static void qspi_enable_ddr_mode(struct fsl_qspi_priv *priv)
static void qspi_init_ahb_read(struct fsl_qspi_priv *priv)
{
struct fsl_qspi_regs *regs = priv->regs;
+ int rx_size = 0x80;
/* AHB configuration for access buffer 0/1/2 .*/
qspi_write32(priv->flags, ®s->buf0cr, QSPI_BUFXCR_INVALID_MSTRID);
qspi_write32(priv->flags, ®s->buf1cr, QSPI_BUFXCR_INVALID_MSTRID);
qspi_write32(priv->flags, ®s->buf2cr, QSPI_BUFXCR_INVALID_MSTRID);
+
+#ifdef CONFIG_SYS_FSL_ERRATUM_A009282
+ /*A-009282: QuadSPI data pre-fetch can result in incorrect data
+ *Workaround: Keep the read data size to 64 bits (8 Bytes), which
+ *disables the prefetch on the AHB buffer,and prevents this issue
+ *from occurring.
+ */
+ rx_size = 0x1;
+#endif
qspi_write32(priv->flags, ®s->buf3cr, QSPI_BUF3CR_ALLMST_MASK |
- (0x80 << QSPI_BUF3CR_ADATSZ_SHIFT));
+ (rx_size << QSPI_BUF3CR_ADATSZ_SHIFT));
/* We only use the buffer3 */
qspi_write32(priv->flags, ®s->buf0ind, 0);
diff --git a/include/configs/ls1012a_common.h b/include/configs/ls1012a_common.h
index 47b8ec3..f0ae355 100644
--- a/include/configs/ls1012a_common.h
+++ b/include/configs/ls1012a_common.h
@@ -68,6 +68,7 @@
#define FSL_QSPI_FLASH_SIZE (1 << 26)
#define FSL_QSPI_FLASH_NUM 2
#define CONFIG_SYS_FSL_QSPI_AHB
+#define CONFIG_SYS_FSL_ERRATUM_A009282
/*
* Environment
--
1.7.9.5
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