From 4642f7eddb75efb5944ff21e5340ccce66928ff1 Mon Sep 17 00:00:00 2001
From: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Date: Fri, 28 Jun 2024 16:15:59 +0300
Subject: [PATCH] i3c: mipi-i3c-hci: Round IBI data chunk size to HW supported
value
The dma.c: hci_dma_init() sets the CHUNK_SIZE field in the IBI_SETUP
register incorrectly if the calculated ibi_chunk_sz is not exactly
2^(n+2) bytes, where n is 0..6.
Fix this by rounding the chunk size up to nearest 2^(n+2) bytes.
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Link: https://lore.kernel.org/r/20240628131559.502822-4-jarkko.nikula@linux.intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
drivers/i3c/master/mipi-i3c-hci/dma.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/i3c/master/mipi-i3c-hci/dma.c b/drivers/i3c/master/mipi-i3c-hci/dma.c
index 9bdfe40bc1e1e..a918e96b21fdd 100644
--- a/drivers/i3c/master/mipi-i3c-hci/dma.c
+++ b/drivers/i3c/master/mipi-i3c-hci/dma.c
@@ -279,6 +279,13 @@ static int hci_dma_init(struct i3c_hci *hci)
rh->ibi_chunk_sz = dma_get_cache_alignment();
rh->ibi_chunk_sz *= IBI_CHUNK_CACHELINES;
+ /*
+ * Round IBI data chunk size to number of bytes supported by
+ * the HW. Chunk size can be 2^n number of DWORDs which is the
+ * same as 2^(n+2) bytes, where n is 0..6.
+ */
+ rh->ibi_chunk_sz = umax(4, rh->ibi_chunk_sz);
+ rh->ibi_chunk_sz = roundup_pow_of_two(rh->ibi_chunk_sz);
if (rh->ibi_chunk_sz > 256) {
ret = -EINVAL;
goto err_out;
--
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