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usb: max-3421: Fix setting of I/O pins

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To update the I/O pins, the registers are read/modified/written. The
read operation incorrectly always read the first register. Although
wrong, there wasn't any impact as all the output pins are always
written, and the inputs are read only anyway.

Fixes: 2d53139f31 ("Add support for using a MAX3421E chip as a host driver.")
Signed-off-by: Mark Tomlinson <mark.tomlinson@alliedtelesis.co.nz>
Link: https://lore.kernel.org/r/20230207033337.18112-1-mark.tomlinson@alliedtelesis.co.nz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mark Tomlinson 2023-02-07 16:33:37 +13:00 committed by Greg Kroah-Hartman
parent 41070a7027
commit a7efe3fc7c
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/host/max3421-hcd.c
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@ -1427,7 +1427,7 @@ max3421_spi_thread(void *dev_id)
* use spi_wr_buf().
*/
for (i = 0; i < ARRAY_SIZE(max3421_hcd->iopins); ++i) {
u8 val = spi_rd8(hcd, MAX3421_REG_IOPINS1);
u8 val = spi_rd8(hcd, MAX3421_REG_IOPINS1 + i);
val = ((val & 0xf0) |
(max3421_hcd->iopins[i] & 0x0f));