package/boot/uboot-layerscape/patches/0071-driver-fsl_qspi-disable-AHB-buffer-prefetch.patch

   1 From e2a5bba97cd6e42b2b631bd17012aa26ffdb5f67 Mon Sep 17 00:00:00 2001
   2 From: Yunhui Cui <yunhui.cui@nxp.com>
   3 Date: Tue, 12 Jul 2016 10:30:08 +0800
   4 Subject: [PATCH 71/93] driver: fsl_qspi: disable AHB buffer prefetch
   5
   6 Errata: A-009282: QuadSPI data pre-fetch can result in incorrect data
   7 When we enable the CONFIG_SYS_FSL_QSPI_AHB, we need this errata workaround.
   8
   9 Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
  10 ---
  11  drivers/spi/fsl_qspi.c           |   12 +++++++++++-
  12  include/configs/ls1012a_common.h |    1 +
  13  2 files changed, 12 insertions(+), 1 deletion(-)
  14
  15 diff --git a/drivers/spi/fsl_qspi.c b/drivers/spi/fsl_qspi.c
  16 index 09759fa..f1c87f5 100644
  17 --- a/drivers/spi/fsl_qspi.c
  18 +++ b/drivers/spi/fsl_qspi.c
  19 @@ -441,13 +441,23 @@ static void qspi_enable_ddr_mode(struct fsl_qspi_priv *priv)
  20  static void qspi_init_ahb_read(struct fsl_qspi_priv *priv)
  21  {
  22         struct fsl_qspi_regs *regs = priv->regs;
  23 +       int rx_size = 0x80;
  24
  25         /* AHB configuration for access buffer 0/1/2 .*/
  26         qspi_write32(priv->flags, &regs->buf0cr, QSPI_BUFXCR_INVALID_MSTRID);
  27         qspi_write32(priv->flags, &regs->buf1cr, QSPI_BUFXCR_INVALID_MSTRID);
  28         qspi_write32(priv->flags, &regs->buf2cr, QSPI_BUFXCR_INVALID_MSTRID);
  29 +
  30 +#ifdef CONFIG_SYS_FSL_ERRATUM_A009282
  31 +       /*A-009282: QuadSPI data pre-fetch can result in incorrect data
  32 +        *Workaround: Keep the read data size to 64 bits (8 Bytes), which
  33 +        *disables the prefetch on the AHB buffer,and prevents this issue
  34 +        *from occurring.
  35 +       */
  36 +       rx_size = 0x1;
  37 +#endif
  38         qspi_write32(priv->flags, &regs->buf3cr, QSPI_BUF3CR_ALLMST_MASK |
  39 -                    (0x80 << QSPI_BUF3CR_ADATSZ_SHIFT));
  40 +                    (rx_size << QSPI_BUF3CR_ADATSZ_SHIFT));
  41
  42         /* We only use the buffer3 */
  43         qspi_write32(priv->flags, &regs->buf0ind, 0);
  44 diff --git a/include/configs/ls1012a_common.h b/include/configs/ls1012a_common.h
  45 index 47b8ec3..f0ae355 100644
  46 --- a/include/configs/ls1012a_common.h
  47 +++ b/include/configs/ls1012a_common.h
  48 @@ -68,6 +68,7 @@
  49  #define FSL_QSPI_FLASH_SIZE            (1 << 26)
  50  #define FSL_QSPI_FLASH_NUM             2
  51  #define CONFIG_SYS_FSL_QSPI_AHB
  52 +#define CONFIG_SYS_FSL_ERRATUM_A009282
  53
  54  /*
  55   * Environment
  56 --
  57 1.7.9.5
  58