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path: root/drivers/mmc/core/mmc.c
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Diffstat (limited to 'drivers/mmc/core/mmc.c')
-rw-r--r--drivers/mmc/core/mmc.c116
1 files changed, 61 insertions, 55 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 39fc5b2b96c5..b61b52f9da3d 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -26,6 +26,8 @@
#include "mmc_ops.h"
#include "sd_ops.h"
+#define DEFAULT_CMD6_TIMEOUT_MS 500
+
static const unsigned int tran_exp[] = {
10000, 100000, 1000000, 10000000,
0, 0, 0, 0
@@ -571,6 +573,7 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
card->erased_byte = 0x0;
/* eMMC v4.5 or later */
+ card->ext_csd.generic_cmd6_time = DEFAULT_CMD6_TIMEOUT_MS;
if (card->ext_csd.rev >= 6) {
card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
@@ -615,6 +618,24 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
(ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) &&
!(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
}
+
+ /* eMMC v5.1 or later */
+ if (card->ext_csd.rev >= 8) {
+ card->ext_csd.cmdq_support = ext_csd[EXT_CSD_CMDQ_SUPPORT] &
+ EXT_CSD_CMDQ_SUPPORTED;
+ card->ext_csd.cmdq_depth = (ext_csd[EXT_CSD_CMDQ_DEPTH] &
+ EXT_CSD_CMDQ_DEPTH_MASK) + 1;
+ /* Exclude inefficiently small queue depths */
+ if (card->ext_csd.cmdq_depth <= 2) {
+ card->ext_csd.cmdq_support = false;
+ card->ext_csd.cmdq_depth = 0;
+ }
+ if (card->ext_csd.cmdq_support) {
+ pr_debug("%s: Command Queue supported depth %u\n",
+ mmc_hostname(card->host),
+ card->ext_csd.cmdq_depth);
+ }
+ }
out:
return err;
}
@@ -1000,19 +1021,6 @@ static int mmc_select_bus_width(struct mmc_card *card)
return err;
}
-/* Caller must hold re-tuning */
-static int mmc_switch_status(struct mmc_card *card)
-{
- u32 status;
- int err;
-
- err = mmc_send_status(card, &status);
- if (err)
- return err;
-
- return mmc_switch_status_error(card->host, status);
-}
-
/*
* Switch to the high-speed mode
*/
@@ -1022,13 +1030,8 @@ static int mmc_select_hs(struct mmc_card *card)
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
- card->ext_csd.generic_cmd6_time,
- true, false, true);
- if (!err) {
- mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
- err = mmc_switch_status(card);
- }
-
+ card->ext_csd.generic_cmd6_time, MMC_TIMING_MMC_HS,
+ true, true, true);
if (err)
pr_warn("%s: switch to high-speed failed, err:%d\n",
mmc_hostname(card->host), err);
@@ -1055,10 +1058,12 @@ static int mmc_select_hs_ddr(struct mmc_card *card)
ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
- err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
- EXT_CSD_BUS_WIDTH,
- ext_csd_bits,
- card->ext_csd.generic_cmd6_time);
+ err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_BUS_WIDTH,
+ ext_csd_bits,
+ card->ext_csd.generic_cmd6_time,
+ MMC_TIMING_MMC_DDR52,
+ true, true, true);
if (err) {
pr_err("%s: switch to bus width %d ddr failed\n",
mmc_hostname(host), 1 << bus_width);
@@ -1101,9 +1106,6 @@ static int mmc_select_hs_ddr(struct mmc_card *card)
if (err)
err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
- if (!err)
- mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
-
return err;
}
@@ -1125,7 +1127,7 @@ static int mmc_select_hs400(struct mmc_card *card)
val = EXT_CSD_TIMING_HS;
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HS_TIMING, val,
- card->ext_csd.generic_cmd6_time,
+ card->ext_csd.generic_cmd6_time, 0,
true, false, true);
if (err) {
pr_err("%s: switch to high-speed from hs200 failed, err:%d\n",
@@ -1160,7 +1162,7 @@ static int mmc_select_hs400(struct mmc_card *card)
card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HS_TIMING, val,
- card->ext_csd.generic_cmd6_time,
+ card->ext_csd.generic_cmd6_time, 0,
true, false, true);
if (err) {
pr_err("%s: switch to hs400 failed, err:%d\n",
@@ -1203,7 +1205,7 @@ int mmc_hs400_to_hs200(struct mmc_card *card)
/* Switch HS400 to HS DDR */
val = EXT_CSD_TIMING_HS;
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
- val, card->ext_csd.generic_cmd6_time,
+ val, card->ext_csd.generic_cmd6_time, 0,
true, false, true);
if (err)
goto out_err;
@@ -1217,7 +1219,7 @@ int mmc_hs400_to_hs200(struct mmc_card *card)
/* Switch HS DDR to HS */
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
EXT_CSD_BUS_WIDTH_8, card->ext_csd.generic_cmd6_time,
- true, false, true);
+ 0, true, false, true);
if (err)
goto out_err;
@@ -1231,14 +1233,19 @@ int mmc_hs400_to_hs200(struct mmc_card *card)
val = EXT_CSD_TIMING_HS200 |
card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
- val, card->ext_csd.generic_cmd6_time,
+ val, card->ext_csd.generic_cmd6_time, 0,
true, false, true);
if (err)
goto out_err;
mmc_set_timing(host, MMC_TIMING_MMC_HS200);
- err = mmc_switch_status(card);
+ /*
+ * For HS200, CRC errors are not a reliable way to know the switch
+ * failed. If there really is a problem, we would expect tuning will
+ * fail and the result ends up the same.
+ */
+ err = __mmc_switch_status(card, false);
if (err)
goto out_err;
@@ -1278,16 +1285,23 @@ static int mmc_select_hs400es(struct mmc_card *card)
goto out_err;
/* Switch card to HS mode */
- err = mmc_select_hs(card);
- if (err)
+ err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
+ card->ext_csd.generic_cmd6_time, 0,
+ true, false, true);
+ if (err) {
+ pr_err("%s: switch to hs for hs400es failed, err:%d\n",
+ mmc_hostname(host), err);
goto out_err;
+ }
- mmc_set_clock(host, card->ext_csd.hs_max_dtr);
-
+ mmc_set_timing(host, MMC_TIMING_MMC_HS);
err = mmc_switch_status(card);
if (err)
goto out_err;
+ mmc_set_clock(host, card->ext_csd.hs_max_dtr);
+
/* Switch card to DDR with strobe bit */
val = EXT_CSD_DDR_BUS_WIDTH_8 | EXT_CSD_BUS_WIDTH_STROBE;
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
@@ -1305,7 +1319,7 @@ static int mmc_select_hs400es(struct mmc_card *card)
card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HS_TIMING, val,
- card->ext_csd.generic_cmd6_time,
+ card->ext_csd.generic_cmd6_time, 0,
true, false, true);
if (err) {
pr_err("%s: switch to hs400es failed, err:%d\n",
@@ -1387,14 +1401,20 @@ static int mmc_select_hs200(struct mmc_card *card)
card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HS_TIMING, val,
- card->ext_csd.generic_cmd6_time,
+ card->ext_csd.generic_cmd6_time, 0,
true, false, true);
if (err)
goto err;
old_timing = host->ios.timing;
mmc_set_timing(host, MMC_TIMING_MMC_HS200);
- err = mmc_switch_status(card);
+ /*
+ * For HS200, CRC errors are not a reliable way to know the
+ * switch failed. If there really is a problem, we would expect
+ * tuning will fail and the result ends up the same.
+ */
+ err = __mmc_switch_status(card, false);
+
/*
* mmc_select_timing() assumes timing has not changed if
* it is a switch error.
@@ -1477,7 +1497,6 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
u32 cid[4];
u32 rocr;
- BUG_ON(!host);
WARN_ON(!host->claimed);
/* Set correct bus mode for MMC before attempting init */
@@ -1851,7 +1870,7 @@ static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_POWER_OFF_NOTIFICATION,
- notify_type, timeout, true, false, false);
+ notify_type, timeout, 0, true, false, false);
if (err)
pr_err("%s: Power Off Notification timed out, %u\n",
mmc_hostname(card->host), timeout);
@@ -1867,9 +1886,6 @@ static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
*/
static void mmc_remove(struct mmc_host *host)
{
- BUG_ON(!host);
- BUG_ON(!host->card);
-
mmc_remove_card(host->card);
host->card = NULL;
}
@@ -1889,9 +1905,6 @@ static void mmc_detect(struct mmc_host *host)
{
int err;
- BUG_ON(!host);
- BUG_ON(!host->card);
-
mmc_get_card(host->card);
/*
@@ -1917,9 +1930,6 @@ static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
EXT_CSD_POWER_OFF_LONG;
- BUG_ON(!host);
- BUG_ON(!host->card);
-
mmc_claim_host(host);
if (mmc_card_suspended(host->card))
@@ -1976,9 +1986,6 @@ static int _mmc_resume(struct mmc_host *host)
{
int err = 0;
- BUG_ON(!host);
- BUG_ON(!host->card);
-
mmc_claim_host(host);
if (!mmc_card_suspended(host->card))
@@ -2111,7 +2118,6 @@ int mmc_attach_mmc(struct mmc_host *host)
int err;
u32 ocr, rocr;
- BUG_ON(!host);
WARN_ON(!host->claimed);
/* Set correct bus mode for MMC before attempting attach */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.