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 <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 11 insertions, 0 deletions

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)
@@ -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.
          */