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 <kuninori.morimoto.gx@xxxxxxxxxxx>
---
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 f1e35a7..d241d86 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)
@@ -219,6 +222,14 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev)
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 a1c1f32..84d9053 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
--
1.7.9.5
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