diff options
Diffstat (limited to 'drivers/i3c')
| -rw-r--r-- | drivers/i3c/master/ast2600-i3c-master.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/i3c/master/ast2600-i3c-master.c b/drivers/i3c/master/ast2600-i3c-master.c index b3f0fe1e63c3..6715d1f044b6 100644 --- a/drivers/i3c/master/ast2600-i3c-master.c +++ b/drivers/i3c/master/ast2600-i3c-master.c @@ -36,6 +36,8 @@ #define AST2600_DEFAULT_SDA_PULLUP_OHMS 2000 +#define DEV_ADDR_TABLE_IBI_PEC BIT(11) + struct ast2600_i3c { struct dw_i3c_master dw; struct regmap *global_regs; @@ -99,8 +101,26 @@ static int ast2600_i3c_init(struct dw_i3c_master *dw) return rc; } +static void ast2600_i3c_set_dat_ibi(struct dw_i3c_master *i3c, + struct i3c_dev_desc *dev, + bool enable, u32 *dat) +{ + /* + * The ast2600 i3c controller will lock up on receiving 4n+1-byte IBIs + * if the PEC is disabled. We have no way to restrict the length of + * IBIs sent to the controller, so we need to unconditionally enable + * PEC checking, which means we drop a byte of payload data + */ + if (enable && dev->info.bcr & I3C_BCR_IBI_PAYLOAD) { + dev_warn_once(&i3c->base.dev, + "Enabling PEC workaround. IBI payloads will be truncated\n"); + *dat |= DEV_ADDR_TABLE_IBI_PEC; + } +} + const struct dw_i3c_platform_ops ast2600_i3c_ops = { .init = ast2600_i3c_init, + .set_dat_ibi = ast2600_i3c_set_dat_ibi, }; static int ast2600_i3c_probe(struct platform_device *pdev) @@ -137,6 +157,7 @@ static int ast2600_i3c_probe(struct platform_device *pdev) i3c->sda_pullup); i3c->dw.platform_ops = &ast2600_i3c_ops; + i3c->dw.ibi_capable = true; return dw_i3c_common_probe(&i3c->dw, pdev); } |