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drm/nouveau/i2c: properly hand aux reply back to caller, and only retry on defer
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
parent
febb844917
commit
842c2953fc
@ -33,7 +33,7 @@ struct nouveau_i2c_func {
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int (*sense_scl)(struct nouveau_i2c_port *);
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int (*sense_sda)(struct nouveau_i2c_port *);
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int (*aux)(struct nouveau_i2c_port *, u8, u32, u8 *, u8);
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int (*aux)(struct nouveau_i2c_port *, bool, u8, u32, u8 *, u8);
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int (*pattern)(struct nouveau_i2c_port *, int pattern);
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int (*lnk_ctl)(struct nouveau_i2c_port *, int nr, int bw, bool enh);
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int (*drv_ctl)(struct nouveau_i2c_port *, int lane, int sw, int pe);
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@ -60,7 +60,8 @@ anx9805_train(struct nouveau_i2c_port *port, int link_nr, int link_bw, bool enh)
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}
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static int
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anx9805_aux(struct nouveau_i2c_port *port, u8 type, u32 addr, u8 *data, u8 size)
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anx9805_aux(struct nouveau_i2c_port *port, bool retry,
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u8 type, u32 addr, u8 *data, u8 size)
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{
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struct anx9805_i2c_port *chan = (void *)port;
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struct nouveau_i2c_port *mast = (void *)nv_object(chan)->parent;
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@ -30,7 +30,7 @@ nv_rdaux(struct nouveau_i2c_port *port, u32 addr, u8 *data, u8 size)
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if (port->func->aux) {
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if (port->func->acquire)
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port->func->acquire(port);
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return port->func->aux(port, 9, addr, data, size);
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return port->func->aux(port, true, 9, addr, data, size);
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}
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return -ENODEV;
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}
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@ -41,7 +41,7 @@ nv_wraux(struct nouveau_i2c_port *port, u32 addr, u8 *data, u8 size)
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if (port->func->aux) {
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if (port->func->acquire)
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port->func->acquire(port);
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return port->func->aux(port, 8, addr, data, size);
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return port->func->aux(port, true, 8, addr, data, size);
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}
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return -ENODEV;
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}
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@ -74,7 +74,7 @@ aux_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
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if (mcnt || remaining > 16)
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cmd |= 4; /* MOT */
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ret = port->func->aux(port, cmd, msg->addr, ptr, cnt);
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ret = port->func->aux(port, true, cmd, msg->addr, ptr, cnt);
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if (ret < 0)
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return ret;
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@ -69,7 +69,8 @@ auxch_init(struct nouveau_i2c *aux, int ch)
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}
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int
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nv94_aux(struct nouveau_i2c_port *base, u8 type, u32 addr, u8 *data, u8 size)
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nv94_aux(struct nouveau_i2c_port *base, bool retry,
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u8 type, u32 addr, u8 *data, u8 size)
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{
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struct nouveau_i2c *aux = nouveau_i2c(base);
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struct nv50_i2c_port *port = (void *)base;
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@ -105,9 +106,8 @@ nv94_aux(struct nouveau_i2c_port *base, u8 type, u32 addr, u8 *data, u8 size)
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ctrl |= size - 1;
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nv_wr32(aux, 0x00e4e0 + (ch * 0x50), addr);
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/* retry transaction a number of times on failure... */
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ret = -EREMOTEIO;
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for (retries = 0; retries < 32; retries++) {
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/* (maybe) retry transaction a number of times on failure... */
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for (retries = 0; !ret && retries < 32; retries++) {
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/* reset, and delay a while if this is a retry */
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nv_wr32(aux, 0x00e4e4 + (ch * 0x50), 0x80000000 | ctrl);
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nv_wr32(aux, 0x00e4e4 + (ch * 0x50), 0x00000000 | ctrl);
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@ -123,16 +123,21 @@ nv94_aux(struct nouveau_i2c_port *base, u8 type, u32 addr, u8 *data, u8 size)
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udelay(1);
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if (!timeout--) {
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AUX_ERR("tx req timeout 0x%08x\n", ctrl);
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ret = -EIO;
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goto out;
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}
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} while (ctrl & 0x00010000);
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ret = 1;
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/* read status, and check if transaction completed ok */
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stat = nv_mask(aux, 0x00e4e8 + (ch * 0x50), 0, 0);
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if (!(stat & 0x000f0f00)) {
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ret = 0;
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break;
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}
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if ((stat & 0x000f0000) == 0x00080000 ||
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(stat & 0x000f0000) == 0x00020000)
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ret = retry ? 0 : 1;
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if ((stat & 0x00000100))
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ret = -ETIMEDOUT;
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if ((stat & 0x00000e00))
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ret = -EIO;
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AUX_DBG("%02d 0x%08x 0x%08x\n", retries, ctrl, stat);
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}
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@ -147,7 +152,7 @@ nv94_aux(struct nouveau_i2c_port *base, u8 type, u32 addr, u8 *data, u8 size)
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out:
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auxch_fini(aux, ch);
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return ret;
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return ret < 0 ? ret : (stat & 0x000f0000) >> 16;
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}
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void
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