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i3c: mipi-i3c-hci: Allow core re-initialization for Runtime PM support

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Prepare i3c_hci_reset_and_init() to support runtime resume.  Update it to
handle the case where the I/O mode has already been selected.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260113072702.16268-18-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Adrian Hunter 2026-01-13 09:26:58 +02:00 committed by Alexandre Belloni
parent 7f91e0e6aa
commit f2b5d43c93
1 changed files with 21 additions and 17 deletions
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38
drivers/i3c/master/mipi-i3c-hci/core.c
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@ -681,27 +681,31 @@ static int i3c_hci_reset_and_init(struct i3c_hci *hci)
}
}
/* Try activating DMA operations first */
if (hci->RHS_regs) {
ret = i3c_hci_set_io_mode(hci, true);
if (!ret) {
hci->io = &mipi_i3c_hci_dma;
dev_dbg(&hci->master.dev, "Using DMA\n");
if (hci->io) {
ret = i3c_hci_set_io_mode(hci, hci->io == &mipi_i3c_hci_dma);
} else {
/* Try activating DMA operations first */
if (hci->RHS_regs) {
ret = i3c_hci_set_io_mode(hci, true);
if (!ret) {
hci->io = &mipi_i3c_hci_dma;
dev_dbg(&hci->master.dev, "Using DMA\n");
}
}
}
/* If no DMA, try PIO */
if (!hci->io && hci->PIO_regs) {
ret = i3c_hci_set_io_mode(hci, false);
if (!ret) {
hci->io = &mipi_i3c_hci_pio;
dev_dbg(&hci->master.dev, "Using PIO\n");
/* If no DMA, try PIO */
if (!hci->io && hci->PIO_regs) {
ret = i3c_hci_set_io_mode(hci, false);
if (!ret) {
hci->io = &mipi_i3c_hci_pio;
dev_dbg(&hci->master.dev, "Using PIO\n");
}
}
}
if (!hci->io) {
dev_err(&hci->master.dev, "neither DMA nor PIO can be used\n");
ret = ret ?: -EINVAL;
if (!hci->io) {
dev_err(&hci->master.dev, "neither DMA nor PIO can be used\n");
ret = ret ?: -EINVAL;
}
}
if (ret)
return ret;