* Re: [PATCH] mmc: enable Enhance Strobe for HS400
@ 2016-02-29 3:41 Shawn Lin
2016-03-01 6:02 ` Sun, Yi Y
0 siblings, 1 reply; 5+ messages in thread
From: Shawn Lin @ 2016-02-29 3:41 UTC (permalink / raw)
To: yi.y.sun; +Cc: shawn.lin, linux-mmc, Ulf Hansson, Adrian Hunter, Jaehoon Chung
Hello Yi Sun,
Any plan to push it[0] forward? My sdhci-arasan 5.1 can support
enhance strobe for hs400. After applying your patch, it does work for
me. It's a big improvement for CMD singnal to gurantee the SI.
[1]: https://patchwork.kernel.org/patch/6545421/
^ permalink raw reply [flat|nested] 5+ messages in thread
* RE: [PATCH] mmc: enable Enhance Strobe for HS400
2016-02-29 3:41 [PATCH] mmc: enable Enhance Strobe for HS400 Shawn Lin
@ 2016-03-01 6:02 ` Sun, Yi Y
0 siblings, 0 replies; 5+ messages in thread
From: Sun, Yi Y @ 2016-03-01 6:02 UTC (permalink / raw)
To: Shawn Lin
Cc: shawn.lin@rock-chips.com, linux-mmc, Ulf Hansson, Hunter, Adrian,
Jaehoon Chung
Hi, Shawn,
Thanks for trying my patch! Because of work scope change, I have not worked on storage domain for some time and do not have test device. So, I am afraid I cannot go on pushing it forward. Sorry for that.
BRs,
Sun Yi
-----Original Message-----
From: Shawn Lin [mailto:shawn.lin@kernel-upstream.org]
Sent: Monday, February 29, 2016 11:42 AM
To: Sun, Yi Y <yi.y.sun@intel.com>
Cc: shawn.lin@rock-chips.com; linux-mmc <linux-mmc@vger.kernel.org>; Ulf Hansson <ulf.hansson@linaro.org>; Hunter, Adrian <adrian.hunter@intel.com>; Jaehoon Chung <jh80.chung@samsung.com>
Subject: Re: [PATCH] mmc: enable Enhance Strobe for HS400
Hello Yi Sun,
Any plan to push it[0] forward? My sdhci-arasan 5.1 can support enhance strobe for hs400. After applying your patch, it does work for me. It's a big improvement for CMD singnal to gurantee the SI.
[1]: https://patchwork.kernel.org/patch/6545421/
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH] mmc: enable Enhance Strobe for HS400.
@ 2015-06-04 10:15 Yi Sun
2015-06-04 11:42 ` Ulf Hansson
2015-06-04 11:44 ` Jaehoon Chung
0 siblings, 2 replies; 5+ messages in thread
From: Yi Sun @ 2015-06-04 10:15 UTC (permalink / raw)
To: linux-mmc; +Cc: yi.y.sun
Enhance Strobe is defined in v5.1 eMMC spec. This commit
is to implement it.
Signed-off-by: Yi Sun <yi.y.sun@intel.com>
---
drivers/mmc/core/mmc.c | 61 ++++++++++++++++++++++++++++++++++++++++++----
include/linux/mmc/card.h | 1 +
include/linux/mmc/mmc.h | 2 ++
3 files changed, 59 insertions(+), 5 deletions(-)
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index e519e31..c9ef2de 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -585,6 +585,12 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
card->ext_csd.ffu_capable =
(ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) &&
!(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
+
+ /* Enhance Strobe is supported since v5.1 which rev should be
+ * 8 but some eMMC devices can support it with rev 7. So handle
+ * Enhance Strobe here.
+ */
+ card->ext_csd.strobe_support = ext_csd[EXT_CSD_STROBE_SUPPORT];
}
out:
return err;
@@ -1049,9 +1055,28 @@ static int mmc_select_hs400(struct mmc_card *card)
/*
* HS400 mode requires 8-bit bus width
*/
- if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
- host->ios.bus_width == MMC_BUS_WIDTH_8))
- return 0;
+ if (card->ext_csd.strobe_support) {
+ if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
+ host->caps & MMC_CAP_8_BIT_DATA))
+ return 0;
+
+ /* For Enhance Strobe flow. For non Enhance Strobe, signal
+ * voltage will not be set.
+ */
+ if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
+ err = __mmc_set_signal_voltage(host,
+ MMC_SIGNAL_VOLTAGE_120);
+
+ if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
+ err = __mmc_set_signal_voltage(host,
+ MMC_SIGNAL_VOLTAGE_180);
+ if (err)
+ return err;
+ } else {
+ if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
+ host->ios.bus_width == MMC_BUS_WIDTH_8))
+ return 0;
+ }
/*
* Before switching to dual data rate operation for HS400,
@@ -1072,15 +1097,36 @@ static int mmc_select_hs400(struct mmc_card *card)
return err;
}
+ val = EXT_CSD_DDR_BUS_WIDTH_8;
+ if (card->ext_csd.strobe_support)
+ val |= EXT_CSD_BUS_WIDTH_STROBE;
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_BUS_WIDTH,
- EXT_CSD_DDR_BUS_WIDTH_8,
+ val,
card->ext_csd.generic_cmd6_time);
if (err) {
pr_err("%s: switch to bus width for hs400 failed, err:%d\n",
mmc_hostname(host), err);
return err;
}
+ if (card->ext_csd.strobe_support) {
+ mmc_set_bus_width(host, MMC_BUS_WIDTH_8);
+ /*
+ * If controller can't handle bus width test,
+ * compare ext_csd previously read in 1 bit mode
+ * against ext_csd at new bus width
+ */
+ if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
+ err = mmc_compare_ext_csds(card, MMC_BUS_WIDTH_8);
+ else
+ err = mmc_bus_test(card, MMC_BUS_WIDTH_8);
+
+ if (err) {
+ pr_warn("%s: switch to bus width %d failed\n",
+ mmc_hostname(host), MMC_BUS_WIDTH_8);
+ return err;
+ }
+ }
val = EXT_CSD_TIMING_HS400 |
card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
@@ -1263,7 +1309,12 @@ static int mmc_select_timing(struct mmc_card *card)
if (!mmc_can_ext_csd(card))
goto bus_speed;
- if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
+ /* For Enhance Strobe HS400 flow */
+ if (card->ext_csd.strobe_support &&
+ card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
+ card->host->caps & MMC_CAP_8_BIT_DATA)
+ err = mmc_select_hs400(card);
+ else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
err = mmc_select_hs200(card);
else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
err = mmc_select_hs(card);
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 4d3776d..b793b61 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -95,6 +95,7 @@ struct mmc_ext_csd {
u8 raw_partition_support; /* 160 */
u8 raw_rpmb_size_mult; /* 168 */
u8 raw_erased_mem_count; /* 181 */
+ u8 strobe_support; /* 184 */
u8 raw_ext_csd_structure; /* 194 */
u8 raw_card_type; /* 196 */
u8 raw_driver_strength; /* 197 */
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 15f2c4a..a1bb32c 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -297,6 +297,7 @@ struct _mmc_csd {
#define EXT_CSD_PART_CONFIG 179 /* R/W */
#define EXT_CSD_ERASED_MEM_CONT 181 /* RO */
#define EXT_CSD_BUS_WIDTH 183 /* R/W */
+#define EXT_CSD_STROBE_SUPPORT 184 /* RO */
#define EXT_CSD_HS_TIMING 185 /* R/W */
#define EXT_CSD_POWER_CLASS 187 /* R/W */
#define EXT_CSD_REV 192 /* RO */
@@ -386,6 +387,7 @@ struct _mmc_csd {
#define EXT_CSD_BUS_WIDTH_8 2 /* Card is in 8 bit mode */
#define EXT_CSD_DDR_BUS_WIDTH_4 5 /* Card is in 4 bit DDR mode */
#define EXT_CSD_DDR_BUS_WIDTH_8 6 /* Card is in 8 bit DDR mode */
+#define EXT_CSD_BUS_WIDTH_STROBE 0x80 /* Card is in 8 bit DDR mode */
#define EXT_CSD_TIMING_BC 0 /* Backwards compatility */
#define EXT_CSD_TIMING_HS 1 /* High speed */
--
1.7.9.5
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH] mmc: enable Enhance Strobe for HS400.
2015-06-04 10:15 Yi Sun
@ 2015-06-04 11:42 ` Ulf Hansson
2015-06-04 11:44 ` Jaehoon Chung
1 sibling, 0 replies; 5+ messages in thread
From: Ulf Hansson @ 2015-06-04 11:42 UTC (permalink / raw)
To: Yi Sun; +Cc: linux-mmc
On 4 June 2015 at 12:15, Yi Sun <yi.y.sun@intel.com> wrote:
> Enhance Strobe is defined in v5.1 eMMC spec. This commit
> is to implement it.
Please elaborate in the change log.
I want to understand what this commit does, at least in a more
detailed summary and without having to read the eMMC spec. You may
also describe *why* we want this.
I have browsed through the code and seems okay, but I will make a more
detailed review once I get a better change log.
Kind regards
Uffe
>
> Signed-off-by: Yi Sun <yi.y.sun@intel.com>
> ---
> drivers/mmc/core/mmc.c | 61 ++++++++++++++++++++++++++++++++++++++++++----
> include/linux/mmc/card.h | 1 +
> include/linux/mmc/mmc.h | 2 ++
> 3 files changed, 59 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index e519e31..c9ef2de 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -585,6 +585,12 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
> card->ext_csd.ffu_capable =
> (ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) &&
> !(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
> +
> + /* Enhance Strobe is supported since v5.1 which rev should be
> + * 8 but some eMMC devices can support it with rev 7. So handle
> + * Enhance Strobe here.
> + */
> + card->ext_csd.strobe_support = ext_csd[EXT_CSD_STROBE_SUPPORT];
> }
> out:
> return err;
> @@ -1049,9 +1055,28 @@ static int mmc_select_hs400(struct mmc_card *card)
> /*
> * HS400 mode requires 8-bit bus width
> */
> - if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
> - host->ios.bus_width == MMC_BUS_WIDTH_8))
> - return 0;
> + if (card->ext_csd.strobe_support) {
> + if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
> + host->caps & MMC_CAP_8_BIT_DATA))
> + return 0;
> +
> + /* For Enhance Strobe flow. For non Enhance Strobe, signal
> + * voltage will not be set.
> + */
> + if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
> + err = __mmc_set_signal_voltage(host,
> + MMC_SIGNAL_VOLTAGE_120);
> +
> + if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
> + err = __mmc_set_signal_voltage(host,
> + MMC_SIGNAL_VOLTAGE_180);
> + if (err)
> + return err;
> + } else {
> + if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
> + host->ios.bus_width == MMC_BUS_WIDTH_8))
> + return 0;
> + }
>
> /*
> * Before switching to dual data rate operation for HS400,
> @@ -1072,15 +1097,36 @@ static int mmc_select_hs400(struct mmc_card *card)
> return err;
> }
>
> + val = EXT_CSD_DDR_BUS_WIDTH_8;
> + if (card->ext_csd.strobe_support)
> + val |= EXT_CSD_BUS_WIDTH_STROBE;
> err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> EXT_CSD_BUS_WIDTH,
> - EXT_CSD_DDR_BUS_WIDTH_8,
> + val,
> card->ext_csd.generic_cmd6_time);
> if (err) {
> pr_err("%s: switch to bus width for hs400 failed, err:%d\n",
> mmc_hostname(host), err);
> return err;
> }
> + if (card->ext_csd.strobe_support) {
> + mmc_set_bus_width(host, MMC_BUS_WIDTH_8);
> + /*
> + * If controller can't handle bus width test,
> + * compare ext_csd previously read in 1 bit mode
> + * against ext_csd at new bus width
> + */
> + if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
> + err = mmc_compare_ext_csds(card, MMC_BUS_WIDTH_8);
> + else
> + err = mmc_bus_test(card, MMC_BUS_WIDTH_8);
> +
> + if (err) {
> + pr_warn("%s: switch to bus width %d failed\n",
> + mmc_hostname(host), MMC_BUS_WIDTH_8);
> + return err;
> + }
> + }
>
> val = EXT_CSD_TIMING_HS400 |
> card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
> @@ -1263,7 +1309,12 @@ static int mmc_select_timing(struct mmc_card *card)
> if (!mmc_can_ext_csd(card))
> goto bus_speed;
>
> - if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
> + /* For Enhance Strobe HS400 flow */
> + if (card->ext_csd.strobe_support &&
> + card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
> + card->host->caps & MMC_CAP_8_BIT_DATA)
> + err = mmc_select_hs400(card);
> + else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
> err = mmc_select_hs200(card);
> else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
> err = mmc_select_hs(card);
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index 4d3776d..b793b61 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -95,6 +95,7 @@ struct mmc_ext_csd {
> u8 raw_partition_support; /* 160 */
> u8 raw_rpmb_size_mult; /* 168 */
> u8 raw_erased_mem_count; /* 181 */
> + u8 strobe_support; /* 184 */
> u8 raw_ext_csd_structure; /* 194 */
> u8 raw_card_type; /* 196 */
> u8 raw_driver_strength; /* 197 */
> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> index 15f2c4a..a1bb32c 100644
> --- a/include/linux/mmc/mmc.h
> +++ b/include/linux/mmc/mmc.h
> @@ -297,6 +297,7 @@ struct _mmc_csd {
> #define EXT_CSD_PART_CONFIG 179 /* R/W */
> #define EXT_CSD_ERASED_MEM_CONT 181 /* RO */
> #define EXT_CSD_BUS_WIDTH 183 /* R/W */
> +#define EXT_CSD_STROBE_SUPPORT 184 /* RO */
> #define EXT_CSD_HS_TIMING 185 /* R/W */
> #define EXT_CSD_POWER_CLASS 187 /* R/W */
> #define EXT_CSD_REV 192 /* RO */
> @@ -386,6 +387,7 @@ struct _mmc_csd {
> #define EXT_CSD_BUS_WIDTH_8 2 /* Card is in 8 bit mode */
> #define EXT_CSD_DDR_BUS_WIDTH_4 5 /* Card is in 4 bit DDR mode */
> #define EXT_CSD_DDR_BUS_WIDTH_8 6 /* Card is in 8 bit DDR mode */
> +#define EXT_CSD_BUS_WIDTH_STROBE 0x80 /* Card is in 8 bit DDR mode */
>
> #define EXT_CSD_TIMING_BC 0 /* Backwards compatility */
> #define EXT_CSD_TIMING_HS 1 /* High speed */
> --
> 1.7.9.5
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH] mmc: enable Enhance Strobe for HS400.
2015-06-04 10:15 Yi Sun
2015-06-04 11:42 ` Ulf Hansson
@ 2015-06-04 11:44 ` Jaehoon Chung
1 sibling, 0 replies; 5+ messages in thread
From: Jaehoon Chung @ 2015-06-04 11:44 UTC (permalink / raw)
To: Yi Sun, linux-mmc
Hi,
On 06/04/2015 07:15 PM, Yi Sun wrote:
> Enhance Strobe is defined in v5.1 eMMC spec. This commit
> is to implement it.
I know what enhance strobe is.
I think good that there is more information for enhance strobe into commit message.
>
> Signed-off-by: Yi Sun <yi.y.sun@intel.com>
> ---
> drivers/mmc/core/mmc.c | 61 ++++++++++++++++++++++++++++++++++++++++++----
> include/linux/mmc/card.h | 1 +
> include/linux/mmc/mmc.h | 2 ++
> 3 files changed, 59 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index e519e31..c9ef2de 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -585,6 +585,12 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
> card->ext_csd.ffu_capable =
> (ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) &&
> !(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
> +
> + /* Enhance Strobe is supported since v5.1 which rev should be
> + * 8 but some eMMC devices can support it with rev 7. So handle
> + * Enhance Strobe here.
> + */
Fix the comment style.
> + card->ext_csd.strobe_support = ext_csd[EXT_CSD_STROBE_SUPPORT];
> }
> out:
> return err;
> @@ -1049,9 +1055,28 @@ static int mmc_select_hs400(struct mmc_card *card)
> /*
> * HS400 mode requires 8-bit bus width
> */
> - if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
> - host->ios.bus_width == MMC_BUS_WIDTH_8))
> - return 0;
Why do you remove these? Can be remained?
> + if (card->ext_csd.strobe_support) {
> + if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
> + host->caps & MMC_CAP_8_BIT_DATA))
> + return 0;
What's difference between (host->ios.bus_width == MMC_BUS_WIDTH_8) and (host->caps & MMC_CAP_8_BIT_DATA)?
> +
> + /* For Enhance Strobe flow. For non Enhance Strobe, signal
> + * voltage will not be set.
> + */
> + if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
> + err = __mmc_set_signal_voltage(host,
> + MMC_SIGNAL_VOLTAGE_120);
> +
> + if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
> + err = __mmc_set_signal_voltage(host,
> + MMC_SIGNAL_VOLTAGE_180);
> + if (err)
> + return err;
Doesn't need to return here?
> + } else {
> + if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
> + host->ios.bus_width == MMC_BUS_WIDTH_8))
> + return 0;
> + }
>
> /*
> * Before switching to dual data rate operation for HS400,
> @@ -1072,15 +1097,36 @@ static int mmc_select_hs400(struct mmc_card *card)
> return err;
> }
>
> + val = EXT_CSD_DDR_BUS_WIDTH_8;
> + if (card->ext_csd.strobe_support)
> + val |= EXT_CSD_BUS_WIDTH_STROBE;
> err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> EXT_CSD_BUS_WIDTH,
> - EXT_CSD_DDR_BUS_WIDTH_8,
> + val,
> card->ext_csd.generic_cmd6_time);
> if (err) {
> pr_err("%s: switch to bus width for hs400 failed, err:%d\n",
> mmc_hostname(host), err);
> return err;
> }
> + if (card->ext_csd.strobe_support) {
> + mmc_set_bus_width(host, MMC_BUS_WIDTH_8);
> + /*
> + * If controller can't handle bus width test,
> + * compare ext_csd previously read in 1 bit mode
> + * against ext_csd at new bus width
> + */
> + if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
> + err = mmc_compare_ext_csds(card, MMC_BUS_WIDTH_8);
> + else
> + err = mmc_bus_test(card, MMC_BUS_WIDTH_8);
> +
> + if (err) {
> + pr_warn("%s: switch to bus width %d failed\n",
> + mmc_hostname(host), MMC_BUS_WIDTH_8);
> + return err;
> + }
> + }
>
> val = EXT_CSD_TIMING_HS400 |
> card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
> @@ -1263,7 +1309,12 @@ static int mmc_select_timing(struct mmc_card *card)
> if (!mmc_can_ext_csd(card))
> goto bus_speed;
>
> - if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
> + /* For Enhance Strobe HS400 flow */
> + if (card->ext_csd.strobe_support &&
> + card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
> + card->host->caps & MMC_CAP_8_BIT_DATA)
Could you modify more readable?
> + err = mmc_select_hs400(card);
> + else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
> err = mmc_select_hs200(card);
> else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
> err = mmc_select_hs(card);
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index 4d3776d..b793b61 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -95,6 +95,7 @@ struct mmc_ext_csd {
> u8 raw_partition_support; /* 160 */
> u8 raw_rpmb_size_mult; /* 168 */
> u8 raw_erased_mem_count; /* 181 */
> + u8 strobe_support; /* 184 */
> u8 raw_ext_csd_structure; /* 194 */
> u8 raw_card_type; /* 196 */
> u8 raw_driver_strength; /* 197 */
> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> index 15f2c4a..a1bb32c 100644
> --- a/include/linux/mmc/mmc.h
> +++ b/include/linux/mmc/mmc.h
> @@ -297,6 +297,7 @@ struct _mmc_csd {
> #define EXT_CSD_PART_CONFIG 179 /* R/W */
> #define EXT_CSD_ERASED_MEM_CONT 181 /* RO */
> #define EXT_CSD_BUS_WIDTH 183 /* R/W */
> +#define EXT_CSD_STROBE_SUPPORT 184 /* RO */
> #define EXT_CSD_HS_TIMING 185 /* R/W */
> #define EXT_CSD_POWER_CLASS 187 /* R/W */
> #define EXT_CSD_REV 192 /* RO */
> @@ -386,6 +387,7 @@ struct _mmc_csd {
> #define EXT_CSD_BUS_WIDTH_8 2 /* Card is in 8 bit mode */
> #define EXT_CSD_DDR_BUS_WIDTH_4 5 /* Card is in 4 bit DDR mode */
> #define EXT_CSD_DDR_BUS_WIDTH_8 6 /* Card is in 8 bit DDR mode */
> +#define EXT_CSD_BUS_WIDTH_STROBE 0x80 /* Card is in 8 bit DDR mode */
Is Comment right? it's enhanced strobe bit.
Best Regards,
Jaehoon Chung
>
> #define EXT_CSD_TIMING_BC 0 /* Backwards compatility */
> #define EXT_CSD_TIMING_HS 1 /* High speed */
>
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2016-03-01 6:02 UTC | newest]
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2016-02-29 3:41 [PATCH] mmc: enable Enhance Strobe for HS400 Shawn Lin
2016-03-01 6:02 ` Sun, Yi Y
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2015-06-04 10:15 Yi Sun
2015-06-04 11:42 ` Ulf Hansson
2015-06-04 11:44 ` Jaehoon Chung
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