From mboxrd@z Thu Jan 1 00:00:00 1970 From: oscardagrach Subject: [PATCH] mmc: dw_mmc-k3: Fix DDR52 mode by setting required clock divisor Date: Thu, 29 Mar 2018 13:24:22 -0500 Message-ID: <20180329182423.21201-1-ryan@edited.us> Return-path: Sender: linux-kernel-owner@vger.kernel.org Cc: oscardagrach , Jaehoon Chung , Ulf Hansson , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-mmc@vger.kernel.org Signed-off-by: oscardagrach --- drivers/mmc/host/dw_mmc-k3.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/host/dw_mmc-k3.c b/drivers/mmc/host/dw_mmc-k3.c index 89cdb3d533bb..efc546cb4db8 100644 --- a/drivers/mmc/host/dw_mmc-k3.c +++ b/drivers/mmc/host/dw_mmc-k3.c @@ -194,8 +194,14 @@ static void dw_mci_hi6220_set_ios(struct dw_mci *host, struct mmc_ios *ios) int ret; unsigned int clock; - clock = (ios->clock <= 25000000) ? 25000000 : ios->clock; - + /* CLKDIV must be 1 for DDR52/8-bit mode */ + if (ios->bus_width == MMC_BUS_WIDTH_8 && + ios->timing == MMC_TIMING_MMC_DDR52) { + mci_writel(host, CLKDIV, 0x1); + clock = ios->clock; + } else { + clock = (ios->clock <= 25000000) ? 25000000 : ios->clock; + } ret = clk_set_rate(host->biu_clk, clock); if (ret) dev_warn(host->dev, "failed to set rate %uHz\n", clock); -- 2.11.0