From mboxrd@z Thu Jan 1 00:00:00 1970 From: guochun.mao@mediatek.com (Guochun Mao) Date: Thu, 30 Mar 2017 16:23:42 +0800 Subject: [PATCH V1 1/1] mtd: mtk-nor: set controller to 4B mode with large capacity flash In-Reply-To: <1490862222-723-1-git-send-email-guochun.mao@mediatek.com> References: <1490862222-723-1-git-send-email-guochun.mao@mediatek.com> Message-ID: <1490862222-723-2-git-send-email-guochun.mao@mediatek.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org when nor's size larger than 16MByte, nor and controller should enter 4Byte mode simultaneously. Signed-off-by: Guochun Mao --- drivers/mtd/spi-nor/mtk-quadspi.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/mtd/spi-nor/mtk-quadspi.c b/drivers/mtd/spi-nor/mtk-quadspi.c index e661877..05cd8a8 100644 --- a/drivers/mtd/spi-nor/mtk-quadspi.c +++ b/drivers/mtd/spi-nor/mtk-quadspi.c @@ -369,6 +369,13 @@ static int mt8173_nor_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, /* We only handle 1 byte */ ret = mt8173_nor_wr_sr(mt8173_nor, *buf); break; + case SPINOR_OP_EN4B: + /* Set nor controller to 4-byte address mode, + * and simultaneously set nor flash. + * This case should cooperate with default operation. + */ + writeb(readb(mt8173_nor->base + MTK_NOR_DUAL_REG) | 0x10, + mt8173_nor->base + MTK_NOR_DUAL_REG); default: ret = mt8173_nor_do_tx_rx(mt8173_nor, opcode, buf, len, NULL, 0); if (ret) -- 1.7.9.5