From e3c418f1b26b59841bd074baa740a43afc15199b Mon Sep 17 00:00:00 2001 From: Kuninori Morimoto Date: Wed, 20 Nov 2013 00:31:13 -0800 Subject: [PATCH] mmc: SDHI: add SoC specific workaround via HW version One of Renesas SDHI chip needs workaround to use it, and, we can judge it based on chip version. This patch adds very quick-hack workaround method, since we still don't know how many chips need workaround in the future. Signed-off-by: Kuninori Morimoto Signed-off-by: Chris Ball --- drivers/mmc/host/sh_mobile_sdhi.c | 11 +++++++++++ include/linux/mmc/tmio.h | 1 + 2 files changed, 12 insertions(+) diff --git a/drivers/mmc/host/sh_mobile_sdhi.c b/drivers/mmc/host/sh_mobile_sdhi.c index 38553ae68e3a..2d6ce257a273 100644 --- a/drivers/mmc/host/sh_mobile_sdhi.c +++ b/drivers/mmc/host/sh_mobile_sdhi.c @@ -33,6 +33,8 @@ #include "tmio_mmc.h" +#define EXT_ACC 0xe4 + struct sh_mobile_sdhi_of_data { unsigned long tmio_flags; }; @@ -137,6 +139,7 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev) int irq, ret, i = 0; bool multiplexed_isr = true; struct tmio_mmc_dma *dma_priv; + u16 ver; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) @@ -218,6 +221,14 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev) if (ret < 0) goto eprobe; + /* + * FIXME: + * this Workaround can be more clever method + */ + ver = sd_ctrl_read16(host, CTL_VERSION); + if (ver == 0xCB0D) + sd_ctrl_write16(host, EXT_ACC, 1); + /* * Allow one or more specific (named) ISRs or * one or more multiplexed (un-named) ISRs. diff --git a/include/linux/mmc/tmio.h b/include/linux/mmc/tmio.h index a1c1f321e519..84d9053b5dca 100644 --- a/include/linux/mmc/tmio.h +++ b/include/linux/mmc/tmio.h @@ -33,6 +33,7 @@ #define CTL_SDIO_IRQ_MASK 0x38 #define CTL_DMA_ENABLE 0xd8 #define CTL_RESET_SD 0xe0 +#define CTL_VERSION 0xe2 #define CTL_SDIO_REGS 0x100 #define CTL_CLK_AND_WAIT_CTL 0x138 #define CTL_RESET_SDIO 0x1e0