>From ad70dbd00db355d1e8ca08e7ad12e73cb41df960 Mon Sep 17 00:00:00 2001
From: Prasanna NAVARATNA <prasanna.navaratna@xxxxxxxxxxxx>
Date: Thu, 4 Apr 2013 19:55:19 +0530
Subject: [PATCH] mmc: core: proper ocr negotiation during resume
Save the card ocr into struct mmc_card when read from card
during initialization of sd/mmc/sdio.
Druing mmc_resume_host, supply saved card's ocr to
mmc_select_voltage so as to negotiate voltage appropriately.
---
drivers/mmc/core/core.c | 2 +-
drivers/mmc/core/mmc.c | 3 +++
drivers/mmc/core/sd.c | 3 +++
drivers/mmc/core/sdio.c | 3 +++
include/linux/mmc/card.h | 1 +
5 files changed, 11 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index ad7decc..aad511a 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2680,7 +2680,7 @@ int mmc_resume_host(struct mmc_host *host)
if (host->bus_ops && !host->bus_dead) {
if (!mmc_card_keep_power(host)) {
mmc_power_up(host);
- mmc_select_voltage(host, host->ocr);
+ mmc_select_voltage(host, host->card->ocr);
/*
* Tell runtime PM core we just powered up the card,
* since it still believes the card is powered off.
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index d584f7c..923eb53 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1566,6 +1566,9 @@ int mmc_attach_mmc(struct mmc_host *host)
ocr &= ~0x7F;
}
+ /* Save the card OCR */
+ host->card->ocr = ocr;
+
host->ocr = mmc_select_voltage(host, ocr);
/*
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 9e645e1..965504b 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -1185,6 +1185,9 @@ int mmc_attach_sd(struct mmc_host *host)
ocr &= ~MMC_VDD_165_195;
}
+ /* Save the card OCR */
+ host->card->ocr = ocr;
+
host->ocr = mmc_select_voltage(host, ocr);
/*
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index aa0719a..3f9e08d 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -1090,6 +1090,9 @@ int mmc_attach_sdio(struct mmc_host *host)
ocr &= ~0x7F;
}
+ /* Save the card OCR */
+ host->card->ocr = ocr;
+
host->ocr = mmc_select_voltage(host, ocr);
/*
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index f31725b..1bbec2f 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -273,6 +273,7 @@ struct mmc_card {
u32 raw_cid[4]; /* raw card CID */
u32 raw_csd[4]; /* raw card CSD */
u32 raw_scr[2]; /* raw card SCR */
+ u32 ocr; /* card OCR */
struct mmc_cid cid; /* card identification */
struct mmc_csd csd; /* card specific */
struct mmc_ext_csd ext_csd; /* mmc v4 extended card
specific */
--
1.7.6
Note :-
1. mmc_select_voltage(host, host->card->ocr);
Here host->card->ocr is directly dereferenced because during resume, we will
always have host->card !
2. Similar to rca, cid, csa, better to have "ocr" structure member in
"struct mmc_card" which is card specific and hopefully ocr field might be
helpful in future too.
Regards,
Prasanna NAVARATNA
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