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From: patrick.oppenlander@gmail.com
To: linux-mmc@vger.kernel.org
Cc: Patrick Oppenlander <patrick.oppenlander@gmail.com>
Subject: [PATCH] mmc-utils: Fix scaling of cache size
Date: Fri, 14 Feb 2020 09:13:32 +1100
Message-ID: <20200213221332.2228810-1-patrick.oppenlander@gmail.com> (raw)

From: Patrick Oppenlander <patrick.oppenlander@gmail.com>

JESD84-B51 7.4.30 CACHE_SIZE [252:249] states that "the size is
indicated as multiple of kilobits". This is also supported by Table 39,
"e.MMC internal sizes and related Units / Granularities" which lists
"32Kb (=4KB)" as the cache size granularity for 4KiB native devices.

Signed-off-by: Patrick Oppenlander <patrick.oppenlander@gmail.com>
---
 mmc_cmds.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mmc_cmds.c b/mmc_cmds.c
index fb37189..a1b1d75 100644
--- a/mmc_cmds.c
+++ b/mmc_cmds.c
@@ -1419,8 +1419,8 @@ int do_read_extcsd(int nargs, char **argv)
 		printf("Power off notification [POWER_OFF_LONG_TIME: 0x%02x]\n",
 			ext_csd[247]);
 		printf("Cache Size [CACHE_SIZE] is %d KiB\n",
-			ext_csd[249] << 0 | (ext_csd[250] << 8) |
-			(ext_csd[251] << 16) | (ext_csd[252] << 24));
+			(ext_csd[249] << 0 | (ext_csd[250] << 8) |
+			(ext_csd[251] << 16) | (ext_csd[252] << 24)) / 8);
 	}
 
 	/* A441: Reserved [501:247]
-- 
2.25.0


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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-13 22:13 patrick.oppenlander [this message]
2020-02-16  7:18 ` Avri Altman

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