linux-kernel - [<PATCH v1> 1/9] mmc: core: Add a cap to use long discard size

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Date:   Mon, 16 Dec 2019 18:50:34 -0800
From:   "Bao D. Nguyen" <nguyenb@...eaurora.org>
To:     ulf.hansson@...aro.org, robh+dt@...nel.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        asutoshd@...eaurora.org, cang@...eaurora.org,
        "Bao D. Nguyen" <nguyenb@...eaurora.org>
Subject: [<PATCH v1> 1/9] mmc: core: Add a cap to use long discard size

Add MMC_CAP2_MAX_DISCARD_SIZE cap which allows setting the max
discard size value if needed.
Setting a high value for the max discard size is to fix an issue where
some SD cards take a long time to perform the card format.

Signed-off-by: Bao D. Nguyen <nguyenb@...eaurora.org>
---
 include/linux/mmc/host.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index ba70338..f1a767d 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -348,6 +348,7 @@ struct mmc_host {
 #define MMC_CAP2_FULL_PWR_CYCLE	(1 << 2)	/* Can do full power cycle */
 #define MMC_CAP2_HS200_1_8V_SDR	(1 << 5)        /* can support */
 #define MMC_CAP2_HS200_1_2V_SDR	(1 << 6)        /* can support */
+#define MMC_CAP2_MAX_DISCARD_SIZE (1 << 8)      /* use max discard, ignoring max_busy_timeout parameter */
 #define MMC_CAP2_HS200		(MMC_CAP2_HS200_1_8V_SDR | \
 				 MMC_CAP2_HS200_1_2V_SDR)
 #define MMC_CAP2_CD_ACTIVE_HIGH	(1 << 10)	/* Card-detect signal active high */
-- 
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