diff mbox series

[v3,4/4] mmc-utils: lsmmc: Fix emmc capacity calculation

Message ID 20230928180658.1795491-5-avri.altman@wdc.com
State New
Headers show
Series mmc-utils: Revamp CSD register parsing | expand

Commit Message

Avri Altman Sept. 28, 2023, 6:06 p.m. UTC 
When the device capacity is larger than 2GB, it shouldn't use c_size but
instead it follows a different calculation using the SEC_COUNT field of
the ext-csd[215:212] - see eMMC spec JESD84-B51 paragraph 7.3.12.

This bug was already in lsmmc when it got merged into mmc-utils, hence
the fixes tag.

Fixes: 4af1749d2350 (mmc-utils: Merge the lsmmc tool into mmc-utils)
Signed-off-by: wanggang26 <wanggang26@xiaomi.com>
Signed-off-by: Avri Altman <avri.altman@wdc.com>
---
 lsmmc.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/lsmmc.c b/lsmmc.c
index c984d9a..9596722 100644
--- a/lsmmc.c
+++ b/lsmmc.c
@@ -1826,6 +1826,9 @@  static void print_mmc_csd_capacity(unsigned int c_size, unsigned int c_size_mult
 	int block_len = 1 << read_bl_len;
 	unsigned long long memory_capacity;
 
+	if (c_size == 0xfff)
+		return;
+
 	printf("\tC_SIZE: 0x%03x\n", c_size);
 	printf("\tC_SIZE_MULT: 0x%01x\n", c_size_mult);