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i3c: mipi-i3c-hci: Cache DAT in memory for Runtime PM restore

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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>
This commit is contained in:
Adrian Hunter 2026-01-13 09:26:49 +02:00 committed by Alexandre Belloni
parent 29bf98a634
commit a372cfac05
2 changed files with 29 additions and 6 deletions
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29
drivers/i3c/master/mipi-i3c-hci/dat_v1.c
View File

@ -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)

6
drivers/i3c/master/mipi-i3c-hci/hci.h
View File

@ -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;