From: Adrian Hunter <adrian.hunter@intel.com>
To: Ulf Hansson <ulf.hansson@linaro.org>, Chris Ball <chris@printf.net>
Cc: linux-mmc <linux-mmc@vger.kernel.org>,
Philip Rakity <prakity@nvidia.com>,
Adrian Hunter <adrian.hunter@intel.com>
Subject: [PATCH 07/12] mmc: mmc: Read card's valid driver strength mask
Date: Thu, 5 Feb 2015 15:13:44 +0200 [thread overview]
Message-ID: <1423142029-22521-8-git-send-email-adrian.hunter@intel.com> (raw)
In-Reply-To: <1423142029-22521-1-git-send-email-adrian.hunter@intel.com>
In preparation for supporing drive strength selection
for eMMC, read the card's valid driver strengths.
Note that though the SD spec uses the term "drive strength",
the JEDEC eMMC spec uses the term "driver strength".
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
drivers/mmc/core/mmc.c | 1 +
include/linux/mmc/card.h | 1 +
include/linux/mmc/mmc.h | 1 +
3 files changed, 3 insertions(+)
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 03577be..3222d4a 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -426,6 +426,7 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
card->ext_csd.raw_trim_mult =
ext_csd[EXT_CSD_TRIM_MULT];
card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
+ card->ext_csd.raw_driver_strength = ext_csd[EXT_CSD_DRIVER_STRENGTH];
if (card->ext_csd.rev >= 4) {
if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] &
EXT_CSD_PART_SETTING_COMPLETED)
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index ad54861..ebfb3c9 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -97,6 +97,7 @@ struct mmc_ext_csd {
u8 raw_erased_mem_count; /* 181 */
u8 raw_ext_csd_structure; /* 194 */
u8 raw_card_type; /* 196 */
+ u8 raw_driver_strength; /* 197 */
u8 out_of_int_time; /* 198 */
u8 raw_pwr_cl_52_195; /* 200 */
u8 raw_pwr_cl_26_195; /* 201 */
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 124f562..4819cfb 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -302,6 +302,7 @@ struct _mmc_csd {
#define EXT_CSD_REV 192 /* RO */
#define EXT_CSD_STRUCTURE 194 /* RO */
#define EXT_CSD_CARD_TYPE 196 /* RO */
+#define EXT_CSD_DRIVER_STRENGTH 197 /* RO */
#define EXT_CSD_OUT_OF_INTERRUPT_TIME 198 /* RO */
#define EXT_CSD_PART_SWITCH_TIME 199 /* RO */
#define EXT_CSD_PWR_CL_52_195 200 /* RO */
--
1.9.1
next prev parent reply other threads:[~2015-02-05 13:18 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-05 13:13 [PATCH 00/12] mmc: Add support for drive strength for eMMCs Adrian Hunter
2015-02-05 13:13 ` [PATCH 01/12] mmc: core: Reset driver type to default Adrian Hunter
2015-02-05 13:13 ` [PATCH 02/12] mmc: core: Allow card drive strength to be different to host Adrian Hunter
2015-02-05 13:13 ` [PATCH 03/12] mmc: core: Simplify card drive strength mask Adrian Hunter
2015-02-05 13:13 ` [PATCH 04/12] mmc: core: Add 'card' to drive strength selection callback Adrian Hunter
2015-02-05 13:13 ` [PATCH 05/12] mmc: core: Factor out common code in drive strength selection Adrian Hunter
2015-02-05 13:13 ` [PATCH 06/12] mmc: core: Record card drive strength Adrian Hunter
2015-02-05 13:13 ` Adrian Hunter [this message]
2015-02-05 13:13 ` [PATCH 08/12] mmc: mmc: Add driver strength selection Adrian Hunter
2015-02-05 13:13 ` [PATCH 09/12] mmc: core: Add function to read driver-strength device property Adrian Hunter
2015-02-05 13:13 ` [PATCH 10/12] mmc: sdhci: Add a callback to select drive strength Adrian Hunter
2015-02-05 13:13 ` [PATCH 11/12] mmc: sdhci-pci: Add support for drive strength selection for SPT Adrian Hunter
2015-02-05 13:13 ` [PATCH 12/12] mmc: sdhci-pci: Enable HS400 for some Intel host controllers Adrian Hunter
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