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mmc: core: Fix select power class after resume 

Use the saved values in card->ext_csd when selecting power class.
By doing this the power class will be selected even if mmc_init_card
is called with oldcard != NULL, which is the case after a suspend/resume.

Today ext_csd is NULL if mmc_init_card is called with oldcard != NULL
and power class will not be selected.

According to the eMMC specification the POWER_CLASS value is reset after
power failure, H/W reset assertion and any CMD0 reset.

Signed-off-by: Fredrik Soderstedt <fredrik.soderstedt@stericsson.com>
Reviewed-by: Johan Rudholm <jrudholm@gmail.com>
Acked By: Girish K S <girish.shivananjappa@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Fredrik Soderstedt 2013-04-23 16:27:07 +02:00 committed by Chris Ball
parent 07a6821608
commit 6044371219
2 changed files with 59 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

74
drivers/mmc/core/mmc.c
View File

@ -461,6 +461,24 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
*/
card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
card->ext_csd.boot_ro_lockable = true;
/* Save power class values */
card->ext_csd.raw_pwr_cl_52_195 =
ext_csd[EXT_CSD_PWR_CL_52_195];
card->ext_csd.raw_pwr_cl_26_195 =
ext_csd[EXT_CSD_PWR_CL_26_195];
card->ext_csd.raw_pwr_cl_52_360 =
ext_csd[EXT_CSD_PWR_CL_52_360];
card->ext_csd.raw_pwr_cl_26_360 =
ext_csd[EXT_CSD_PWR_CL_26_360];
card->ext_csd.raw_pwr_cl_200_195 =
ext_csd[EXT_CSD_PWR_CL_200_195];
card->ext_csd.raw_pwr_cl_200_360 =
ext_csd[EXT_CSD_PWR_CL_200_360];
card->ext_csd.raw_pwr_cl_ddr_52_195 =
ext_csd[EXT_CSD_PWR_CL_DDR_52_195];
card->ext_csd.raw_pwr_cl_ddr_52_360 =
ext_csd[EXT_CSD_PWR_CL_DDR_52_360];
}
if (card->ext_csd.rev >= 5) {
@ -607,7 +625,23 @@ static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
(card->ext_csd.raw_sectors[2] ==
bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
(card->ext_csd.raw_sectors[3] ==
bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
bw_ext_csd[EXT_CSD_SEC_CNT + 3]) &&
(card->ext_csd.raw_pwr_cl_52_195 ==
bw_ext_csd[EXT_CSD_PWR_CL_52_195]) &&
(card->ext_csd.raw_pwr_cl_26_195 ==
bw_ext_csd[EXT_CSD_PWR_CL_26_195]) &&
(card->ext_csd.raw_pwr_cl_52_360 ==
bw_ext_csd[EXT_CSD_PWR_CL_52_360]) &&
(card->ext_csd.raw_pwr_cl_26_360 ==
bw_ext_csd[EXT_CSD_PWR_CL_26_360]) &&
(card->ext_csd.raw_pwr_cl_200_195 ==
bw_ext_csd[EXT_CSD_PWR_CL_200_195]) &&
(card->ext_csd.raw_pwr_cl_200_360 ==
bw_ext_csd[EXT_CSD_PWR_CL_200_360]) &&
(card->ext_csd.raw_pwr_cl_ddr_52_195 ==
bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) &&
(card->ext_csd.raw_pwr_cl_ddr_52_360 ==
bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]));
if (err)
err = -EINVAL;
@ -676,11 +710,10 @@ static struct device_type mmc_type = {
* mmc_switch command.
*/
static int mmc_select_powerclass(struct mmc_card *card,
unsigned int bus_width, u8 *ext_csd)
unsigned int bus_width)
{
int err = 0;
unsigned int pwrclass_val;
unsigned int index = 0;
unsigned int pwrclass_val = 0;
struct mmc_host *host;
BUG_ON(!card);
@ -688,9 +721,6 @@ static int mmc_select_powerclass(struct mmc_card *card,
host = card->host;
BUG_ON(!host);
if (ext_csd == NULL)
return 0;
/* Power class selection is supported for versions >= 4.0 */
if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
return 0;
@ -702,13 +732,13 @@ static int mmc_select_powerclass(struct mmc_card *card,
switch (1 << host->ios.vdd) {
case MMC_VDD_165_195:
if (host->ios.clock <= 26000000)
index = EXT_CSD_PWR_CL_26_195;
pwrclass_val = card->ext_csd.raw_pwr_cl_26_195;
else if (host->ios.clock <= 52000000)
index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
EXT_CSD_PWR_CL_52_195 :
EXT_CSD_PWR_CL_DDR_52_195;
pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
card->ext_csd.raw_pwr_cl_52_195 :
card->ext_csd.raw_pwr_cl_ddr_52_195;
else if (host->ios.clock <= 200000000)
index = EXT_CSD_PWR_CL_200_195;
pwrclass_val = card->ext_csd.raw_pwr_cl_200_195;
break;
case MMC_VDD_27_28:
case MMC_VDD_28_29:
@ -720,13 +750,13 @@ static int mmc_select_powerclass(struct mmc_card *card,
case MMC_VDD_34_35:
case MMC_VDD_35_36:
if (host->ios.clock <= 26000000)
index = EXT_CSD_PWR_CL_26_360;
pwrclass_val = card->ext_csd.raw_pwr_cl_26_360;
else if (host->ios.clock <= 52000000)
index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
EXT_CSD_PWR_CL_52_360 :
EXT_CSD_PWR_CL_DDR_52_360;
pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
card->ext_csd.raw_pwr_cl_52_360 :
card->ext_csd.raw_pwr_cl_ddr_52_360;
else if (host->ios.clock <= 200000000)
index = EXT_CSD_PWR_CL_200_360;
pwrclass_val = card->ext_csd.raw_pwr_cl_200_360;
break;
default:
pr_warning("%s: Voltage range not supported "
@ -734,8 +764,6 @@ static int mmc_select_powerclass(struct mmc_card *card,
return -EINVAL;
}
pwrclass_val = ext_csd[index];
if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
EXT_CSD_PWR_CL_8BIT_SHIFT;
@ -1131,7 +1159,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4;
err = mmc_select_powerclass(card, ext_csd_bits, ext_csd);
err = mmc_select_powerclass(card, ext_csd_bits);
if (err)
pr_warning("%s: power class selection to bus width %d"
" failed\n", mmc_hostname(card->host),
@ -1164,8 +1192,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
bus_width = bus_widths[idx];
if (bus_width == MMC_BUS_WIDTH_1)
ddr = 0; /* no DDR for 1-bit width */
err = mmc_select_powerclass(card, ext_csd_bits[idx][0],
ext_csd);
err = mmc_select_powerclass(card, ext_csd_bits[idx][0]);
if (err)
pr_warning("%s: power class selection to "
"bus width %d failed\n",
@ -1195,8 +1222,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
}
if (!err && ddr) {
err = mmc_select_powerclass(card, ext_csd_bits[idx][1],
ext_csd);
err = mmc_select_powerclass(card, ext_csd_bits[idx][1]);
if (err)
pr_warning("%s: power class selection to "
"bus width %d ddr %d failed\n",

10
include/linux/mmc/card.h
View File

@ -94,7 +94,11 @@ struct mmc_ext_csd {
u8 raw_ext_csd_structure; /* 194 */
u8 raw_card_type; /* 196 */
u8 out_of_int_time; /* 198 */
u8 raw_s_a_timeout; /* 217 */
u8 raw_pwr_cl_52_195; /* 200 */
u8 raw_pwr_cl_26_195; /* 201 */
u8 raw_pwr_cl_52_360; /* 202 */
u8 raw_pwr_cl_26_360; /* 203 */
u8 raw_s_a_timeout; /* 217 */
u8 raw_hc_erase_gap_size; /* 221 */
u8 raw_erase_timeout_mult; /* 223 */
u8 raw_hc_erase_grp_size; /* 224 */
@ -102,6 +106,10 @@ struct mmc_ext_csd {
u8 raw_sec_erase_mult; /* 230 */
u8 raw_sec_feature_support;/* 231 */
u8 raw_trim_mult; /* 232 */
u8 raw_pwr_cl_200_195; /* 236 */
u8 raw_pwr_cl_200_360; /* 237 */
u8 raw_pwr_cl_ddr_52_195; /* 238 */
u8 raw_pwr_cl_ddr_52_360; /* 239 */
u8 raw_bkops_status; /* 246 */
u8 raw_sectors[4]; /* 212 - 4 bytes */