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mmc: use the generic timeout for cmd6 (SWITCH) provided in the ext_csd

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Starting with rev 4.5, the eMMC can define a generic timeout for the
SWITCH command.

Following Linux Kernel code, the timeout also changed from 1000 -> 500

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
This commit is contained in:
Jean-Jacques Hiblot 2019-07-02 10:53:54 +02:00 committed by Peng Fan
parent cd0b80ec9c
commit 39320c537d
2 changed files with 11 additions and 1 deletions
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10
drivers/mmc/mmc.c
View file

@ -21,6 +21,8 @@
#include <div64.h>
#include "mmc_private.h"
#define DEFAULT_CMD6_TIMEOUT_MS 500
static int mmc_set_signal_voltage(struct mmc *mmc, uint signal_voltage);
static int mmc_power_cycle(struct mmc *mmc);
#if !CONFIG_IS_ENABLED(MMC_TINY)
@ -745,10 +747,13 @@ static int __mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value,
bool send_status)
{
struct mmc_cmd cmd;
int timeout = 1000;
int timeout = DEFAULT_CMD6_TIMEOUT_MS;
int retries = 3;
int ret;
if (mmc->gen_cmd6_time)
timeout = mmc->gen_cmd6_time * 10;
cmd.cmdidx = MMC_CMD_SWITCH;
cmd.resp_type = MMC_RSP_R1b;
cmd.cmdarg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
@ -2135,6 +2140,9 @@ static int mmc_startup_v4(struct mmc *mmc)
mmc->capacity_user = capacity;
}
if (mmc->version >= MMC_VERSION_4_5)
mmc->gen_cmd6_time = ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
/* The partition data may be non-zero but it is only
* effective if PARTITION_SETTING_COMPLETED is set in
* EXT_CSD, so ignore any data if this bit is not set,

2
include/mmc.h
View file

@ -230,6 +230,7 @@ static inline bool mmc_is_tuning_cmd(uint cmdidx)
#define EXT_CSD_HC_WP_GRP_SIZE 221 /* RO */
#define EXT_CSD_HC_ERASE_GRP_SIZE 224 /* RO */
#define EXT_CSD_BOOT_MULT 226 /* RO */
#define EXT_CSD_GENERIC_CMD6_TIME 248 /* RO */
#define EXT_CSD_BKOPS_SUPPORT 502 /* RO */
/*
@ -585,6 +586,7 @@ struct mmc {
u8 part_attr;
u8 wr_rel_set;
u8 part_config;
u8 gen_cmd6_time;
uint tran_speed;
uint legacy_speed; /* speed for the legacy mode provided by the card */
uint read_bl_len;