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i3c: mipi-i3c-hci: Add DMA suspend and resume support

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Introduce helper functions to suspend and resume DMA operations.  These
are required to prepare for upcoming Runtime PM support, ensuring that
DMA state is properly managed during power transitions.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260113072702.16268-12-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Adrian Hunter 2026-01-13 09:26:52 +02:00 committed by Alexandre Belloni
parent f5401c973e
commit 8169587204
2 changed files with 27 additions and 0 deletions
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25
drivers/i3c/master/mipi-i3c-hci/dma.c
View File

@ -275,6 +275,29 @@ static void hci_dma_init_rings(struct i3c_hci *hci)
hci_dma_init_rh(hci, &rings->headers[i], i);
}
static void hci_dma_suspend(struct i3c_hci *hci)
{
struct hci_rings_data *rings = hci->io_data;
int n = rings ? rings->total : 0;
for (int i = 0; i < n; i++) {
struct hci_rh_data *rh = &rings->headers[i];
rh_reg_write(INTR_SIGNAL_ENABLE, 0);
rh_reg_write(RING_CONTROL, 0);
}
i3c_hci_sync_irq_inactive(hci);
}
static void hci_dma_resume(struct i3c_hci *hci)
{
struct hci_rings_data *rings = hci->io_data;
if (rings)
hci_dma_init_rings(hci);
}
static int hci_dma_init(struct i3c_hci *hci)
{
struct hci_rings_data *rings;
@ -865,4 +888,6 @@ const struct hci_io_ops mipi_i3c_hci_dma = {
.request_ibi = hci_dma_request_ibi,
.free_ibi = hci_dma_free_ibi,
.recycle_ibi_slot = hci_dma_recycle_ibi_slot,
.suspend = hci_dma_suspend,
.resume = hci_dma_resume,
};

2
drivers/i3c/master/mipi-i3c-hci/hci.h
View File

@ -125,6 +125,8 @@ struct hci_io_ops {
struct i3c_ibi_slot *slot);
int (*init)(struct i3c_hci *hci);
void (*cleanup)(struct i3c_hci *hci);
void (*suspend)(struct i3c_hci *hci);
void (*resume)(struct i3c_hci *hci);
};
extern const struct hci_io_ops mipi_i3c_hci_pio;