mmc: sd: query function modes for uhs cards

SD cards which conform to Physical Layer Spec v3.01 can support
additional Bus Speed Modes, Driver Strength, and Current Limit
other than the default values. We use CMD6 mode 0 to read these
additional card functions. The values read here will be used
during UHS-I initialization steps.

Tested by Zhangfei Gao with a Toshiba uhs card and general hs card,
on mmp2 in SDMA mode.

Signed-off-by: Arindam Nath <arindam.nath@amd.com>
Reviewed-by: Philip Rakity <prakity@marvell.com>
Tested-by: Philip Rakity <prakity@marvell.com>
Acked-by: Zhangfei Gao <zhangfei.gao@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 72a98681ef47..56f4d9234a66 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -67,6 +67,7 @@ struct mmc_ext_csd {
 
 struct sd_scr {
         unsigned char           sda_vsn;
+        unsigned char           sda_spec3;
         unsigned char           bus_widths;
 #define SD_SCR_BUS_WIDTH_1      (1<<0)
 #define SD_SCR_BUS_WIDTH_4      (1<<2)
@@ -80,6 +81,9 @@ struct sd_ssr {
 
 struct sd_switch_caps {
         unsigned int            hs_max_dtr;
+        unsigned int            sd3_bus_mode;
+        unsigned int            sd3_drv_type;
+        unsigned int            sd3_curr_limit;
 };
 
 struct sdio_cccr {