linux-kernel - [PATCH V2 12/32] omap_hsmmc: keep track of power mode

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Message-Id: <20090728104003.2371.75463.sendpatchset@ahunter-laptop>
Date:	Tue, 28 Jul 2009 13:40:03 +0300
From:	Adrian Hunter <adrian.hunter@...ia.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jarkko Lavinen <jarkko.lavinen@...ia.com>,
	Adrian Hunter <adrian.hunter@...ia.com>,
	linux-omap Mailing List <linux-omap@...r.kernel.org>,
	Pierre Ossman <pierre@...man.eu>,
	Denis Karpov <ext-denis.2.karpov@...ia.com>,
	Matt Fleming <matt@...sole-pimps.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH V2 12/32] omap_hsmmc: keep track of power mode

>From 3592682a0965d32d3498f7da11073ff4d88f1bf7 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@...ia.com>
Date: Tue, 7 Jul 2009 16:44:11 +0300
Subject: [PATCH] omap_hsmmc: keep track of power mode

This patch is preparation for adding context save
and restore support.

Keep track of the current power mode so that the
context restore function can avoid restoring the
context for a card if the power has been switched
off.  If the power is off, the card must be
reinitialized anyway which will re-establish the
context.

Signed-off-by: Adrian Hunter <adrian.hunter@...ia.com>
---
 drivers/mmc/host/omap_hsmmc.c |   27 +++++++++++++++++++--------
 1 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index f9b7cfe..c28d055 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -141,6 +141,7 @@ struct mmc_omap_host {
 	unsigned int		dma_len;
 	unsigned int		dma_sg_idx;
 	unsigned char		bus_mode;
+	unsigned char		power_mode;
 	u32			*buffer;
 	u32			bytesleft;
 	int			suspended;
@@ -856,16 +857,25 @@ static void omap_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 	unsigned long regval;
 	unsigned long timeout;
 	u32 con;
+	int do_send_init_stream = 0;
 
 	mmc_host_enable(host->mmc);
 
-	switch (ios->power_mode) {
-	case MMC_POWER_OFF:
-		mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
-		break;
-	case MMC_POWER_UP:
-		mmc_slot(host).set_power(host->dev, host->slot_id, 1, ios->vdd);
-		break;
+	if (ios->power_mode != host->power_mode) {
+		switch (ios->power_mode) {
+		case MMC_POWER_OFF:
+			mmc_slot(host).set_power(host->dev, host->slot_id,
+						 0, 0);
+			break;
+		case MMC_POWER_UP:
+			mmc_slot(host).set_power(host->dev, host->slot_id,
+						 1, ios->vdd);
+			break;
+		case MMC_POWER_ON:
+			do_send_init_stream = 1;
+			break;
+		}
+		host->power_mode = ios->power_mode;
 	}
 
 	con = OMAP_HSMMC_READ(host->base, CON);
@@ -931,7 +941,7 @@ static void omap_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 	OMAP_HSMMC_WRITE(host->base, SYSCTL,
 		OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
 
-	if (ios->power_mode == MMC_POWER_ON)
+	if (do_send_init_stream)
 		send_init_stream(host);
 
 	if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
@@ -1109,6 +1119,7 @@ static int __init omap_mmc_probe(struct platform_device *pdev)
 	host->slot_id	= 0;
 	host->mapbase	= res->start;
 	host->base	= ioremap(host->mapbase, SZ_4K);
+	host->power_mode = -1;
 
 	platform_set_drvdata(pdev, host);
 	INIT_WORK(&host->mmc_carddetect_work, mmc_omap_detect);
-- 
1.5.6.3

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