linux-kernel - [PATCH] mmc: enable ERASE caps for mvsdio host

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Date:	Thu, 17 Mar 2011 19:42:26 +0100
From:	Sascha Silbe <sascha-ml-reply-to-2011-2@...be.org>
To:	linux-mmc@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Chris Ball <cjb@...top.org>,
	Nicolas Pitre <nico@...xnic.net>
Subject: [PATCH] mmc: enable ERASE caps for mvsdio host

From: Sascha Silbe <sascha-pgp@...be.org>

The Marvell SDIO host controller can transmit Erase commands to the card quite
fine.

Signed-off-by: Sascha Silbe <sascha-pgp@...be.org>
---
 drivers/mmc/host/mvsdio.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

Tested on OpenRD-Base using a SanDisk 4GB class 4 card (retail). The
BLKDISCARD ioctl returned immediately, no timeout issue encountered.
I had to remove and reinsert the card to read the new (i.e. erased) data, but
that's most likely either by design or a bug on a different layer.


diff --git a/drivers/mmc/host/mvsdio.c b/drivers/mmc/host/mvsdio.c
index eeb1147..758251d 100644
--- a/drivers/mmc/host/mvsdio.c
+++ b/drivers/mmc/host/mvsdio.c
@@ -735,7 +735,8 @@ static int __init mvsd_probe(struct platform_device *pdev)

 	mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
 	mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ |
-		    MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
+		    MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED |
+		    MMC_CAP_ERASE;

 	mmc->f_min = DIV_ROUND_UP(host->base_clock, MVSD_BASE_DIV_MAX);
 	mmc->f_max = maxfreq;
--
1.7.4.1

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