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| author | Adrian Hunter <adrian.hunter@intel.com> | 2026-01-13 10:26:50 +0300 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2026-01-14 19:21:09 +0300 |
| commit | f180524a4877329bca4285e36f1fad63b70577ea (patch) | |
| tree | 4aaad0e9039c909ed5d503bf7ca1373193cfea04 | |
| parent | a372cfac056abb555d6c70c08af548aea0ab5cde (diff) | |
| download | linux-f180524a4877329bca4285e36f1fad63b70577ea.tar.xz | |
i3c: mipi-i3c-hci: Introduce helper to restore DAT
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>
| -rw-r--r-- | drivers/i3c/master/mipi-i3c-hci/dat.h | 1 | ||||
| -rw-r--r-- | drivers/i3c/master/mipi-i3c-hci/dat_v1.c | 9 |
2 files changed, 10 insertions, 0 deletions
diff --git a/drivers/i3c/master/mipi-i3c-hci/dat.h b/drivers/i3c/master/mipi-i3c-hci/dat.h index 5277c65fc601..6881f19da77f 100644 --- a/drivers/i3c/master/mipi-i3c-hci/dat.h +++ b/drivers/i3c/master/mipi-i3c-hci/dat.h @@ -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; diff --git a/drivers/i3c/master/mipi-i3c-hci/dat_v1.c b/drivers/i3c/master/mipi-i3c-hci/dat_v1.c index 644ab939be1c..852966aa20d9 100644 --- a/drivers/i3c/master/mipi-i3c-hci/dat_v1.c +++ b/drivers/i3c/master/mipi-i3c-hci/dat_v1.c @@ -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, }; |