[src/trunk]: src/sys/dev/sdmmc For SD cards, send the SET_WR_BLK_ERASE_COUNT ...

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/d6754e4d681a
branches:  trunk
changeset: 356253:d6754e4d681a
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Tue Sep 12 13:43:37 2017 +0000

description:
For SD cards, send the SET_WR_BLK_ERASE_COUNT app command before a
multi-block write to improve write performance.

diffstat:

 sys/dev/sdmmc/sdmmc_mem.c |  16 ++++++++++++++--
 sys/dev/sdmmc/sdmmcreg.h  |   3 ++-
 2 files changed, 16 insertions(+), 3 deletions(-)

diffs (54 lines):

diff -r c3247c96fdce -r d6754e4d681a sys/dev/sdmmc/sdmmc_mem.c
--- a/sys/dev/sdmmc/sdmmc_mem.c Tue Sep 12 10:46:33 2017 +0000
+++ b/sys/dev/sdmmc/sdmmc_mem.c Tue Sep 12 13:43:37 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: sdmmc_mem.c,v 1.62 2017/08/20 15:58:43 mlelstv Exp $   */
+/*     $NetBSD: sdmmc_mem.c,v 1.63 2017/09/12 13:43:37 jmcneill Exp $  */
 /*     $OpenBSD: sdmmc_mem.c,v 1.10 2009/01/09 10:55:22 jsg Exp $      */
 
 /*
@@ -45,7 +45,7 @@
 /* Routines for SD/MMC memory cards. */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: sdmmc_mem.c,v 1.62 2017/08/20 15:58:43 mlelstv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: sdmmc_mem.c,v 1.63 2017/09/12 13:43:37 jmcneill Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_sdmmc.h"
@@ -2021,6 +2021,18 @@
                        goto out;
        }
 
+       const int nblk = howmany(datalen, SDMMC_SECTOR_SIZE);
+       if (ISSET(sc->sc_flags, SMF_SD_MODE) && nblk > 1) {
+               /* Set the number of write blocks to be pre-erased */
+               memset(&cmd, 0, sizeof(cmd));
+               cmd.c_opcode = SD_APP_SET_WR_BLK_ERASE_COUNT;
+               cmd.c_flags = SCF_RSP_R1 | SCF_RSP_SPI_R1 | SCF_CMD_AC;
+               cmd.c_arg = nblk;
+               error = sdmmc_app_command(sc, sf, &cmd);
+               if (error)
+                       goto out;
+       }
+
        memset(&cmd, 0, sizeof(cmd));
        cmd.c_data = data;
        cmd.c_datalen = datalen;
diff -r c3247c96fdce -r d6754e4d681a sys/dev/sdmmc/sdmmcreg.h
--- a/sys/dev/sdmmc/sdmmcreg.h  Tue Sep 12 10:46:33 2017 +0000
+++ b/sys/dev/sdmmc/sdmmcreg.h  Tue Sep 12 13:43:37 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: sdmmcreg.h,v 1.32 2017/07/16 17:11:46 jmcneill Exp $   */
+/*     $NetBSD: sdmmcreg.h,v 1.33 2017/09/12 13:43:37 jmcneill Exp $   */
 /*     $OpenBSD: sdmmcreg.h,v 1.4 2009/01/09 10:55:22 jsg Exp $        */
 
 /*
@@ -67,6 +67,7 @@
 /* SD application commands */                  /* response type */
 #define SD_APP_SET_BUS_WIDTH           6       /* R1 */
 #define SD_APP_SD_STATUS               13      /* R1 */
+#define SD_APP_SET_WR_BLK_ERASE_COUNT  23      /* R1 */
 #define SD_APP_OP_COND                 41      /* R3 */
 #define SD_APP_SEND_SCR                        51      /* R1 */