Shawn,

On Thu, May 19, 2016 at 6:48 PM, Shawn Lin [off-list ref] wrote:

quoted

quoted

  #define EXT_CSD_BUS_WIDTH_1    0       /* Card is in 1 bit mode */
  #define EXT_CSD_BUS_WIDTH_4    1       /* Card is in 4 bit mode */
  #define EXT_CSD_BUS_WIDTH_8    2       /* Card is in 8 bit mode */
  #define EXT_CSD_DDR_BUS_WIDTH_4        5       /* Card is in 4 bit DDR
mode */
  #define EXT_CSD_DDR_BUS_WIDTH_8        6       /* Card is in 8 bit DDR
mode */
+#define EXT_CSD_BUS_WIDTH_STROBE BIT(7)        /* Enhanced strobe mode
*/

nit: while your code should be OK, it seems better to be BIT(3), since
above is really:

I don't unstand here. EXT_CSD_BUS_WIDTH_STROBE is the MSB of
BUS_WIDTH[183] which is a 8-bit reg.

I totally misunderstood.  You are correct.

-Doug