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67 lines
2.4 KiB
67 lines
2.4 KiB
From 50aac689d5be0a086f076cd4bc8b14ee0b9ab995 Mon Sep 17 00:00:00 2001
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From: Yunhui Cui <yunhui.cui@nxp.com>
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Date: Tue, 8 Mar 2016 14:38:52 +0800
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Subject: [PATCH 107/113] mtd: fsl-quadspi: disable AHB buffer prefetch
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A-009282: QuadSPI: QuadSPI data pre-fetch can result in incorrect data
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Affects: QuadSPI
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Description: With AHB buffer prefetch enabled, the QuadSPI may return
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incorrect data on the AHB
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interface. The buffer pre-fetch is enabled if the fetch size as
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configured either in the LUT or in
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the BUFxCR register is greater than 8 bytes.
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Impact: Only 64 bit read allowed.
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Workaround: Keep the read data size to 64 bits (8 Bytes), which disables
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the prefetch on the AHB buffer,
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and prevents this issue from occurring.
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Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
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---
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drivers/mtd/spi-nor/fsl-quadspi.c | 29 +++++++++++++++++++++++------
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1 file changed, 23 insertions(+), 6 deletions(-)
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--- a/drivers/mtd/spi-nor/fsl-quadspi.c
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+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
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@@ -794,19 +794,36 @@ static void fsl_qspi_init_abh_read(struc
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{
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void __iomem *base = q->iobase;
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int seqid;
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+ const struct fsl_qspi_devtype_data *devtype_data = q->devtype_data;
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/* AHB configuration for access buffer 0/1/2 .*/
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qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF0CR);
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qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF1CR);
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qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF2CR);
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+
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/*
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- * Set ADATSZ with the maximum AHB buffer size to improve the
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- * read performance.
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+ * Errata: A-009282: QuadSPI data prefetch may result in incorrect data
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+ * Workaround: Keep the read data size to 64 bits (8 bytes).
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+ * This disables the prefetch on the AHB buffer and
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+ * prevents this issue from occurring.
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*/
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- qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
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- ((q->devtype_data->ahb_buf_size / 8)
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- << QUADSPI_BUF3CR_ADATSZ_SHIFT),
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- base + QUADSPI_BUF3CR);
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+ if (devtype_data->devtype == FSL_QUADSPI_LS2080A ||
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+ devtype_data->devtype == FSL_QUADSPI_LS1021A) {
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+
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+ qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
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+ (1 << QUADSPI_BUF3CR_ADATSZ_SHIFT),
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+ base + QUADSPI_BUF3CR);
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+
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+ } else {
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+ /*
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+ * Set ADATSZ with the maximum AHB buffer size to improve the
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+ * read performance.
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+ */
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+ qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
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+ ((q->devtype_data->ahb_buf_size / 8)
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+ << QUADSPI_BUF3CR_ADATSZ_SHIFT),
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+ base + QUADSPI_BUF3CR);
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+ }
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/* We only use the buffer3 */
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qspi_writel(q, 0, base + QUADSPI_BUF0IND);
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