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drm/nouveau/i2c: properly hand aux reply back to caller, and only retry on defer

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Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2014-05-07 15:13:45 +10:00
parent febb844917
commit 842c2953fc
4 changed files with 20 additions and 14 deletions
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2
drivers/gpu/drm/nouveau/core/include/subdev/i2c.h
View File

@ -33,7 +33,7 @@ struct nouveau_i2c_func {
int (*sense_scl)(struct nouveau_i2c_port *);
int (*sense_sda)(struct nouveau_i2c_port *);
int (*aux)(struct nouveau_i2c_port *, u8, u32, u8 *, u8);
int (*aux)(struct nouveau_i2c_port *, bool, u8, u32, u8 *, u8);
int (*pattern)(struct nouveau_i2c_port *, int pattern);
int (*lnk_ctl)(struct nouveau_i2c_port *, int nr, int bw, bool enh);
int (*drv_ctl)(struct nouveau_i2c_port *, int lane, int sw, int pe);

3
drivers/gpu/drm/nouveau/core/subdev/i2c/anx9805.c
View File

@ -60,7 +60,8 @@ anx9805_train(struct nouveau_i2c_port *port, int link_nr, int link_bw, bool enh)
}
static int
anx9805_aux(struct nouveau_i2c_port *port, u8 type, u32 addr, u8 *data, u8 size)
anx9805_aux(struct nouveau_i2c_port *port, bool retry,
u8 type, u32 addr, u8 *data, u8 size)
{
struct anx9805_i2c_port *chan = (void *)port;
struct nouveau_i2c_port *mast = (void *)nv_object(chan)->parent;

6
drivers/gpu/drm/nouveau/core/subdev/i2c/aux.c
View File

@ -30,7 +30,7 @@ nv_rdaux(struct nouveau_i2c_port *port, u32 addr, u8 *data, u8 size)
if (port->func->aux) {
if (port->func->acquire)
port->func->acquire(port);
return port->func->aux(port, 9, addr, data, size);
return port->func->aux(port, true, 9, addr, data, size);
}
return -ENODEV;
}
@ -41,7 +41,7 @@ nv_wraux(struct nouveau_i2c_port *port, u32 addr, u8 *data, u8 size)
if (port->func->aux) {
if (port->func->acquire)
port->func->acquire(port);
return port->func->aux(port, 8, addr, data, size);
return port->func->aux(port, true, 8, addr, data, size);
}
return -ENODEV;
}
@ -74,7 +74,7 @@ aux_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
if (mcnt || remaining > 16)
cmd |= 4; /* MOT */
ret = port->func->aux(port, cmd, msg->addr, ptr, cnt);
ret = port->func->aux(port, true, cmd, msg->addr, ptr, cnt);
if (ret < 0)
return ret;

23
drivers/gpu/drm/nouveau/core/subdev/i2c/nv94.c
View File

@ -69,7 +69,8 @@ auxch_init(struct nouveau_i2c *aux, int ch)
}
int
nv94_aux(struct nouveau_i2c_port *base, u8 type, u32 addr, u8 *data, u8 size)
nv94_aux(struct nouveau_i2c_port *base, bool retry,
u8 type, u32 addr, u8 *data, u8 size)
{
struct nouveau_i2c *aux = nouveau_i2c(base);
struct nv50_i2c_port *port = (void *)base;
@ -105,9 +106,8 @@ nv94_aux(struct nouveau_i2c_port *base, u8 type, u32 addr, u8 *data, u8 size)
ctrl |= size - 1;
nv_wr32(aux, 0x00e4e0 + (ch * 0x50), addr);
/* retry transaction a number of times on failure... */
ret = -EREMOTEIO;
for (retries = 0; retries < 32; retries++) {
/* (maybe) retry transaction a number of times on failure... */
for (retries = 0; !ret && retries < 32; retries++) {
/* reset, and delay a while if this is a retry */
nv_wr32(aux, 0x00e4e4 + (ch * 0x50), 0x80000000 | ctrl);
nv_wr32(aux, 0x00e4e4 + (ch * 0x50), 0x00000000 | ctrl);
@ -123,16 +123,21 @@ nv94_aux(struct nouveau_i2c_port *base, u8 type, u32 addr, u8 *data, u8 size)
udelay(1);
if (!timeout--) {
AUX_ERR("tx req timeout 0x%08x\n", ctrl);
ret = -EIO;
goto out;
}
} while (ctrl & 0x00010000);
ret = 1;
/* read status, and check if transaction completed ok */
stat = nv_mask(aux, 0x00e4e8 + (ch * 0x50), 0, 0);
if (!(stat & 0x000f0f00)) {
ret = 0;
break;
}
if ((stat & 0x000f0000) == 0x00080000 ||
(stat & 0x000f0000) == 0x00020000)
ret = retry ? 0 : 1;
if ((stat & 0x00000100))
ret = -ETIMEDOUT;
if ((stat & 0x00000e00))
ret = -EIO;
AUX_DBG("%02d 0x%08x 0x%08x\n", retries, ctrl, stat);
}
@ -147,7 +152,7 @@ nv94_aux(struct nouveau_i2c_port *base, u8 type, u32 addr, u8 *data, u8 size)
out:
auxch_fini(aux, ch);
return ret;
return ret < 0 ? ret : (stat & 0x000f0000) >> 16;
}
void