* [PATCH] mci: core: clarify why write_bl_len is the same as read_bl_len
@ 2024-06-13 15:27 Jules Maselbas
2024-06-14 6:32 ` Sascha Hauer
0 siblings, 1 reply; 2+ messages in thread
From: Jules Maselbas @ 2024-06-13 15:27 UTC (permalink / raw)
To: barebox; +Cc: Jules Maselbas
Signed-off-by: Jules Maselbas <jmaselbas@zdiv.net>
---
drivers/mci/mci-core.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
index 5a8f81ecb8..0afb0d26c8 100644
--- a/drivers/mci/mci-core.c
+++ b/drivers/mci/mci-core.c
@@ -1070,8 +1070,12 @@ static void mci_extract_block_lengths_from_csd(struct mci *mci)
{
mci->read_bl_len = 1 << UNSTUFF_BITS(mci->csd, 80, 4);
+ /* Quoting Physical Layer Simplified Specification Version 9.10:
+ * Note that in an SD Memory Card the WRITE_BL_LEN is always
+ * equal to READ_BL_LEN.
+ */
if (IS_SD(mci))
- mci->write_bl_len = mci->read_bl_len; /* FIXME why? */
+ mci->write_bl_len = mci->read_bl_len;
else
mci->write_bl_len = 1 << ((mci->csd[3] >> 22) & 0xf);
--
2.45.0
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2024-06-13 15:27 [PATCH] mci: core: clarify why write_bl_len is the same as read_bl_len Jules Maselbas
2024-06-14 6:32 ` Sascha Hauer
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