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| author | Nicolas Pitre <npitre@baylibre.com> | 2020-04-15 22:30:01 +0200 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@collabora.com> | 2020-04-16 14:27:46 +0200 |
| commit | b4203ce0556348dcfe29f897d1dbe65102874d89 (patch) | |
| tree | 05ea519601df4175ecdfcbc1d2bd515c1cc8edbd /drivers/i3c | |
| parent | Linux 5.7-rc1 (diff) | |
| download | linux-b4203ce0556348dcfe29f897d1dbe65102874d89.tar.xz linux-b4203ce0556348dcfe29f897d1dbe65102874d89.zip | |
i3c master: GETMRL's 3rd byte is optional even with BCR_IBI_PAYLOAD
According to the I3C spec v1.1 document, GETMRL's payload is 2 bytes,
with an optional 3rd byte if the IBI private payload is larger than
1 byte. The whole GETMRL may also be optional so max_ibi_len already
defaults to 1 if BCR_IBI_PAYLOAD prior to the i3c_master_getmrl_locked()
call.
Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-i3c/nycvar.YSQ.7.76.2004151623060.2671@knanqh.ubzr
Diffstat (limited to 'drivers/i3c')
| -rw-r--r-- | drivers/i3c/master.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index d79cd6d54b3a..97f2e29265da 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -1008,7 +1008,6 @@ static int i3c_master_getmrl_locked(struct i3c_master_controller *master, struct i3c_device_info *info) { struct i3c_ccc_cmd_dest dest; - unsigned int expected_len; struct i3c_ccc_mrl *mrl; struct i3c_ccc_cmd cmd; int ret; @@ -1024,22 +1023,23 @@ static int i3c_master_getmrl_locked(struct i3c_master_controller *master, if (!(info->bcr & I3C_BCR_IBI_PAYLOAD)) dest.payload.len -= 1; - expected_len = dest.payload.len; i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETMRL, &dest, 1); ret = i3c_master_send_ccc_cmd_locked(master, &cmd); if (ret) goto out; - if (dest.payload.len != expected_len) { + switch (dest.payload.len) { + case 3: + info->max_ibi_len = mrl->ibi_len; + fallthrough; + case 2: + info->max_read_len = be16_to_cpu(mrl->read_len); + break; + default: ret = -EIO; goto out; } - info->max_read_len = be16_to_cpu(mrl->read_len); - - if (info->bcr & I3C_BCR_IBI_PAYLOAD) - info->max_ibi_len = mrl->ibi_len; - out: i3c_ccc_cmd_dest_cleanup(&dest); |