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| author | Jeremy Kerr <jk@codeconstruct.com.au> | 2023-03-30 15:50:35 +0800 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2023-04-28 08:20:07 +0200 |
| commit | f3a3553a51e64379dbb2e980f0024f7a28b74977 (patch) | |
| tree | 55785b2866cbe814cd8a8ef1b00a585df71577f9 /drivers/i3c | |
| parent | e389b1d72a6241b326071dd75e1b33f9e8818cd1 (diff) | |
| download | linux-f3a3553a51e64379dbb2e980f0024f7a28b74977.tar.gz linux-f3a3553a51e64379dbb2e980f0024f7a28b74977.tar.bz2 linux-f3a3553a51e64379dbb2e980f0024f7a28b74977.zip | |
i3c: dw: Add a platform facility for IBI PEC workarounds
On the AST2600 i3c controller, we'll need to apply a workaround for a
hardware issue with IBI payloads.
Introduce a platform hook to allow dw i3c platform implementations to
modify the DAT entry in IBI enable/disable to allow this workaround in a
future change.
Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/d5d76a8d2336d2a71886537f42e71d51db184df6.1680161823.git.jk@codeconstruct.com.au
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'drivers/i3c')
| -rw-r--r-- | drivers/i3c/master/dw-i3c-master.c | 19 | ||||
| -rw-r--r-- | drivers/i3c/master/dw-i3c-master.h | 10 |
2 files changed, 29 insertions, 0 deletions
diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c index 05f896d6e2cb..9332ae5f6419 100644 --- a/drivers/i3c/master/dw-i3c-master.c +++ b/drivers/i3c/master/dw-i3c-master.c @@ -1155,6 +1155,7 @@ static void dw_i3c_master_set_sir_enabled(struct dw_i3c_master *master, } else { reg |= DEV_ADDR_TABLE_SIR_REJECT; } + master->platform_ops->set_dat_ibi(master, dev, enable, ®); writel(reg, master->regs + dat_entry); reg = readl(master->regs + IBI_SIR_REQ_REJECT); @@ -1247,6 +1248,17 @@ static void dw_i3c_master_handle_ibi_sir(struct dw_i3c_master *master, addr = IBI_QUEUE_IBI_ADDR(status); len = IBI_QUEUE_STATUS_DATA_LEN(status); + /* + * We be tempted to check the error status in bit 30; however, due + * to the PEC errata workaround on some platform implementations (see + * ast2600_i3c_set_dat_ibi()), those will almost always have a PEC + * error on IBI payload data, as well as losing the last byte of + * payload. + * + * If we implement error status checking on that bit, we may need + * a new platform op to validate it. + */ + spin_lock_irqsave(&master->devs_lock, flags); idx = dw_i3c_master_get_addr_pos(master, addr); if (idx < 0) { @@ -1387,8 +1399,15 @@ static int dw_i3c_platform_init_nop(struct dw_i3c_master *i3c) return 0; } +static void dw_i3c_platform_set_dat_ibi_nop(struct dw_i3c_master *i3c, + struct i3c_dev_desc *dev, + bool enable, u32 *dat) +{ +} + static const struct dw_i3c_platform_ops dw_i3c_platform_ops_default = { .init = dw_i3c_platform_init_nop, + .set_dat_ibi = dw_i3c_platform_set_dat_ibi_nop, }; int dw_i3c_common_probe(struct dw_i3c_master *master, diff --git a/drivers/i3c/master/dw-i3c-master.h b/drivers/i3c/master/dw-i3c-master.h index a5425fa6b7d4..ab862c5d15fe 100644 --- a/drivers/i3c/master/dw-i3c-master.h +++ b/drivers/i3c/master/dw-i3c-master.h @@ -66,6 +66,16 @@ struct dw_i3c_platform_ops { * perform actual device enabling with the i3c core ready. */ int (*init)(struct dw_i3c_master *i3c); + + /* + * Initialise a DAT entry to enable/disable IBIs. Allows the platform + * to perform any device workarounds on the DAT entry before + * inserting into the hardware table. + * + * Called with the DAT lock held; must not sleep. + */ + void (*set_dat_ibi)(struct dw_i3c_master *i3c, + struct i3c_dev_desc *dev, bool enable, u32 *reg); }; extern int dw_i3c_common_probe(struct dw_i3c_master *master, |