diff options
Diffstat (limited to 'target/linux/layerscape/patches-4.4/1107-mtd-fsl-quadspi-disable-AHB-buffer-prefetch.patch')
| -rw-r--r-- | target/linux/layerscape/patches-4.4/1107-mtd-fsl-quadspi-disable-AHB-buffer-prefetch.patch | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-4.4/1107-mtd-fsl-quadspi-disable-AHB-buffer-prefetch.patch b/target/linux/layerscape/patches-4.4/1107-mtd-fsl-quadspi-disable-AHB-buffer-prefetch.patch new file mode 100644 index 0000000000..19dff6c92e --- /dev/null +++ b/target/linux/layerscape/patches-4.4/1107-mtd-fsl-quadspi-disable-AHB-buffer-prefetch.patch @@ -0,0 +1,67 @@ +From 50aac689d5be0a086f076cd4bc8b14ee0b9ab995 Mon Sep 17 00:00:00 2001 +From: Yunhui Cui <yunhui.cui@nxp.com> +Date: Tue, 8 Mar 2016 14:38:52 +0800 +Subject: [PATCH 107/113] mtd: fsl-quadspi: disable AHB buffer prefetch + +A-009282: QuadSPI: QuadSPI data pre-fetch can result in incorrect data +Affects: QuadSPI +Description: With AHB buffer prefetch enabled, the QuadSPI may return +incorrect data on the AHB +interface. The buffer pre-fetch is enabled if the fetch size as +configured either in the LUT or in +the BUFxCR register is greater than 8 bytes. +Impact: Only 64 bit read allowed. +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. + +Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com> +--- + drivers/mtd/spi-nor/fsl-quadspi.c | 29 +++++++++++++++++++++++------ + 1 file changed, 23 insertions(+), 6 deletions(-) + +--- a/drivers/mtd/spi-nor/fsl-quadspi.c ++++ b/drivers/mtd/spi-nor/fsl-quadspi.c +@@ -794,19 +794,36 @@ static void fsl_qspi_init_abh_read(struc + { + void __iomem *base = q->iobase; + int seqid; ++ const struct fsl_qspi_devtype_data *devtype_data = q->devtype_data; + + /* AHB configuration for access buffer 0/1/2 .*/ + qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF0CR); + qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF1CR); + qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF2CR); ++ + /* +- * Set ADATSZ with the maximum AHB buffer size to improve the +- * read performance. ++ * Errata: A-009282: QuadSPI data prefetch may result in incorrect data ++ * Workaround: Keep the read data size to 64 bits (8 bytes). ++ * This disables the prefetch on the AHB buffer and ++ * prevents this issue from occurring. + */ +- qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK | +- ((q->devtype_data->ahb_buf_size / 8) +- << QUADSPI_BUF3CR_ADATSZ_SHIFT), +- base + QUADSPI_BUF3CR); ++ if (devtype_data->devtype == FSL_QUADSPI_LS2080A || ++ devtype_data->devtype == FSL_QUADSPI_LS1021A) { ++ ++ qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK | ++ (1 << QUADSPI_BUF3CR_ADATSZ_SHIFT), ++ base + QUADSPI_BUF3CR); ++ ++ } else { ++ /* ++ * Set ADATSZ with the maximum AHB buffer size to improve the ++ * read performance. ++ */ ++ qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK | ++ ((q->devtype_data->ahb_buf_size / 8) ++ << QUADSPI_BUF3CR_ADATSZ_SHIFT), ++ base + QUADSPI_BUF3CR); ++ } + + /* We only use the buffer3 */ + qspi_writel(q, 0, base + QUADSPI_BUF0IND); |