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i3c: mipi-i3c-hci: Round IBI data chunk size to HW supported value

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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>
This commit is contained in:
Jarkko Nikula 2024-06-28 16:15:59 +03:00 committed by Alexandre Belloni
parent 8a2be2f1db
commit 4642f7eddb
1 changed files with 7 additions and 0 deletions
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7
drivers/i3c/master/mipi-i3c-hci/dma.c
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@ -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;