diff options
| author | Adrian Hunter <adrian.hunter@intel.com> | 2026-01-13 10:26:49 +0300 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2026-01-14 19:21:09 +0300 |
| commit | a372cfac056abb555d6c70c08af548aea0ab5cde (patch) | |
| tree | 98ae43b754b2934696c2a54a48714565cf47eebb | |
| parent | 29bf98a6346ad7a80136ba58116c2a0f8a3cb03f (diff) | |
| download | linux-a372cfac056abb555d6c70c08af548aea0ab5cde.tar.xz | |
i3c: mipi-i3c-hci: Cache DAT in memory for Runtime PM restore
Prepare for Runtime PM support, which requires restoring the Device Address
Table (DAT) registers after resume. Maintain a copy of DAT in memory so it
can be reprogrammed when the controller is powered back up.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260113072702.16268-9-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| -rw-r--r-- | drivers/i3c/master/mipi-i3c-hci/dat_v1.c | 29 | ||||
| -rw-r--r-- | drivers/i3c/master/mipi-i3c-hci/hci.h | 6 |
2 files changed, 29 insertions, 6 deletions
diff --git a/drivers/i3c/master/mipi-i3c-hci/dat_v1.c b/drivers/i3c/master/mipi-i3c-hci/dat_v1.c index c60ef5d77ca3..644ab939be1c 100644 --- a/drivers/i3c/master/mipi-i3c-hci/dat_v1.c +++ b/drivers/i3c/master/mipi-i3c-hci/dat_v1.c @@ -34,13 +34,26 @@ /* DAT_0_IBI_PAYLOAD W0_BIT_(12) */ #define DAT_0_STATIC_ADDRESS W0_MASK(6, 0) -#define dat_w0_read(i) readl(hci->DAT_regs + (i) * 8) -#define dat_w1_read(i) readl(hci->DAT_regs + (i) * 8 + 4) -#define dat_w0_write(i, v) writel(v, hci->DAT_regs + (i) * 8) -#define dat_w1_write(i, v) writel(v, hci->DAT_regs + (i) * 8 + 4) +#define dat_w0_read(i) hci->DAT[i].w0 +#define dat_w1_read(i) hci->DAT[i].w1 +#define dat_w0_write(i, v) hci_dat_w0_write(hci, i, v) +#define dat_w1_write(i, v) hci_dat_w1_write(hci, i, v) + +static inline void hci_dat_w0_write(struct i3c_hci *hci, int i, u32 v) +{ + hci->DAT[i].w0 = v; + writel(v, hci->DAT_regs + i * 8); +} + +static inline void hci_dat_w1_write(struct i3c_hci *hci, int i, u32 v) +{ + hci->DAT[i].w1 = v; + writel(v, hci->DAT_regs + i * 8 + 4); +} static int hci_dat_v1_init(struct i3c_hci *hci) { + struct device *dev = hci->master.dev.parent; unsigned int dat_idx; if (!hci->DAT_regs) { @@ -54,9 +67,13 @@ static int hci_dat_v1_init(struct i3c_hci *hci) return -EOPNOTSUPP; } - if (!hci->DAT_data) { - struct device *dev = hci->master.dev.parent; + if (!hci->DAT) { + hci->DAT = devm_kcalloc(dev, hci->DAT_entries, hci->DAT_entry_size, GFP_KERNEL); + if (!hci->DAT) + return -ENOMEM; + } + if (!hci->DAT_data) { /* use a bitmap for faster free slot search */ hci->DAT_data = devm_bitmap_zalloc(dev, hci->DAT_entries, GFP_KERNEL); if (!hci->DAT_data) diff --git a/drivers/i3c/master/mipi-i3c-hci/hci.h b/drivers/i3c/master/mipi-i3c-hci/hci.h index fd08b701d094..aa8a03594e64 100644 --- a/drivers/i3c/master/mipi-i3c-hci/hci.h +++ b/drivers/i3c/master/mipi-i3c-hci/hci.h @@ -31,6 +31,11 @@ struct hci_cmd_ops; +struct dat_words { + u32 w0; + u32 w1; +}; + /* Our main structure */ struct i3c_hci { struct i3c_master_controller master; @@ -51,6 +56,7 @@ struct i3c_hci { unsigned int DAT_entries; unsigned int DAT_entry_size; void *DAT_data; + struct dat_words *DAT; unsigned int DCT_entries; unsigned int DCT_entry_size; u8 version_major; |