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i3c: mipi-i3c-hci: Introduce helper to restore DAT

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Add a dedicated function to restore the Device Address Table (DAT) in
preparation for Runtime PM support.  This will allow reprogramming the DAT
after the controller resumes from a low-power state.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260113072702.16268-10-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Adrian Hunter 2026-01-13 09:26:50 +02:00 • committed by Alexandre Belloni
parent a372cfac05
commit f180524a48
2 changed files with 10 additions and 0 deletions
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1
drivers/i3c/master/mipi-i3c-hci/dat.h
View file

@ -24,6 +24,7 @@ struct hci_dat_ops {
void (*set_flags)(struct i3c_hci *hci, unsigned int dat_idx, u32 w0, u32 w1);
void (*clear_flags)(struct i3c_hci *hci, unsigned int dat_idx, u32 w0, u32 w1);
int (*get_index)(struct i3c_hci *hci, u8 address);
void (*restore)(struct i3c_hci *hci);
};
extern const struct hci_dat_ops mipi_i3c_hci_dat_v1;

9
drivers/i3c/master/mipi-i3c-hci/dat_v1.c
View file

@ -181,6 +181,14 @@ static int hci_dat_v1_get_index(struct i3c_hci *hci, u8 dev_addr)
return -ENODEV;
}
static void hci_dat_v1_restore(struct i3c_hci *hci)
{
for (int i = 0; i < hci->DAT_entries; i++) {
writel(hci->DAT[i].w0, hci->DAT_regs + i * 8);
writel(hci->DAT[i].w1, hci->DAT_regs + i * 8 + 4);
}
}
const struct hci_dat_ops mipi_i3c_hci_dat_v1 = {
.init = hci_dat_v1_init,
.alloc_entry = hci_dat_v1_alloc_entry,
@ -190,4 +198,5 @@ const struct hci_dat_ops mipi_i3c_hci_dat_v1 = {
.set_flags = hci_dat_v1_set_flags,
.clear_flags = hci_dat_v1_clear_flags,
.get_index = hci_dat_v1_get_index,
.restore = hci_dat_v1_restore,
};