openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

Merge branch 'linux-5.3' of git://github.com/skeggsb/linux into drm-fixes 

Fixes i2c on DP with some docks.

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Ben Skeggs <skeggsb@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/CACAvsv713t2_BQ44gVV7Lqic6Vwmhq0r4FB5v-t0kD1jzFrbmQ@mail.gmail.com
This commit is contained in:
Dave Airlie 2019-08-23 13:53:59 +10:00
parent 75710f08ea c358ebf596
commit a4a759b279
1 changed files with 17 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/gpu/drm/nouveau/nvkm/subdev/i2c/aux.c
View File

@ -40,8 +40,7 @@ nvkm_i2c_aux_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
u8 *ptr = msg->buf;
while (remaining) {
u8 cnt = (remaining > 16) ? 16 : remaining;
u8 cmd;
u8 cnt, retries, cmd;
if (msg->flags & I2C_M_RD)
cmd = 1;
@ -51,10 +50,19 @@ nvkm_i2c_aux_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
if (mcnt || remaining > 16)
cmd |= 4; /* MOT */
ret = aux->func->xfer(aux, true, cmd, msg->addr, ptr, &cnt);
if (ret < 0) {
nvkm_i2c_aux_release(aux);
return ret;
for (retries = 0, cnt = 0;
retries < 32 && !cnt;
retries++) {
cnt = min_t(u8, remaining, 16);
ret = aux->func->xfer(aux, true, cmd,
msg->addr, ptr, &cnt);
if (ret < 0)
goto out;
}
if (!cnt) {
AUX_TRACE(aux, "no data after 32 retries");
ret = -EIO;
goto out;
}
ptr += cnt;
@ -64,8 +72,10 @@ nvkm_i2c_aux_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
msg++;
}
ret = num;
out:
nvkm_i2c_aux_release(aux);
return num;
return ret;
}
static u32