drm/nouveau: fix init table handlers to return proper error codes

We really want to be able to distinguish between INIT_DONE and an actual
error sometimes.  This commit fixes up several lazy "return 0;" to be
actual error codes, and explicitly reserves "0" as "success, but stop
parsing this table".

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 28 insertions, 23 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c b/drivers/gpu/drm/nouveau/nouveau_bios.c
index 3c9c54e16a5a..387ac734e9b9 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bios.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bios.c
@@ -257,6 +257,11 @@ static bool NVShadowVBIOS(struct drm_device *dev, uint8_t *data)
 struct init_tbl_entry {
         char *name;
         uint8_t id;
+        /* Return:
+         *  > 0: success, length of opcode
+         *    0: success, but abort further parsing of table (INIT_DONE etc)
+         *  < 0: failure, table parsing will be aborted
+         */
         int (*handler)(struct nvbios *, uint16_t, struct init_exec *);
 };
 
@@ -819,7 +824,7 @@ init_io_restrict_prog(struct nvbios *bios, uint16_t offset,
                 NV_ERROR(bios->dev,
                          "0x%04X: Config 0x%02X exceeds maximal bound 0x%02X\n",
                          offset, config, count);
-                return 0;
+                return -EINVAL;
         }
 
         configval = ROM32(bios->data[offset + 11 + config * 4]);
@@ -921,7 +926,7 @@ init_io_restrict_pll(struct nvbios *bios, uint16_t offset,
                 NV_ERROR(bios->dev,
                          "0x%04X: Config 0x%02X exceeds maximal bound 0x%02X\n",
                          offset, config, count);
-                return 0;
+                return -EINVAL;
         }
 
         freq = ROM16(bios->data[offset + 12 + config * 2]);
@@ -1291,7 +1296,7 @@ init_io_restrict_pll2(struct nvbios *bios, uint16_t offset,
                 NV_ERROR(bios->dev,
                          "0x%04X: Config 0x%02X exceeds maximal bound 0x%02X\n",
                          offset, config, count);
-                return 0;
+                return -EINVAL;
         }
 
         freq = ROM32(bios->data[offset + 11 + config * 4]);
@@ -1368,7 +1373,7 @@ init_i2c_byte(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
 
         chan = init_i2c_device_find(bios->dev, i2c_index);
         if (!chan)
-                return 0;
+                return -ENODEV;
 
         for (i = 0; i < count; i++) {
                 uint8_t i2c_reg = bios->data[offset + 4 + i * 3];
@@ -1381,7 +1386,7 @@ init_i2c_byte(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
                 msg.len = 1;
                 msg.buf = &value;
                 if (i2c_transfer(&chan->adapter, &msg, 1) != 1)
-                        return 0;
+                        return -EIO;
 
                 BIOSLOG(bios, "0x%04X: I2CReg: 0x%02X, Value: 0x%02X, "
                               "Mask: 0x%02X, Data: 0x%02X\n",
@@ -1395,7 +1400,7 @@ init_i2c_byte(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
                         msg.len = 1;
                         msg.buf = &value;
                         if (i2c_transfer(&chan->adapter, &msg, 1) != 1)
-                                return 0;
+                                return -EIO;
                 }
         }
 
@@ -1438,7 +1443,7 @@ init_zm_i2c_byte(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
 
         chan = init_i2c_device_find(bios->dev, i2c_index);
         if (!chan)
-                return 0;
+                return -ENODEV;
 
         for (i = 0; i < count; i++) {
                 uint8_t i2c_reg = bios->data[offset + 4 + i * 2];
@@ -1453,7 +1458,7 @@ init_zm_i2c_byte(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
                         msg.len = 1;
                         msg.buf = &data;
                         if (i2c_transfer(&chan->adapter, &msg, 1) != 1)
-                                return 0;
+                                return -EIO;
                 }
         }
 
@@ -1495,7 +1500,7 @@ init_zm_i2c(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
 
         chan = init_i2c_device_find(bios->dev, i2c_index);
         if (!chan)
-                return 0;
+                return -ENODEV;
 
         for (i = 0; i < count; i++) {
                 data[i] = bios->data[offset + 4 + i];
@@ -1509,7 +1514,7 @@ init_zm_i2c(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
                 msg.len = count;
                 msg.buf = data;
                 if (i2c_transfer(&chan->adapter, &msg, 1) != 1)
-                        return 0;
+                        return -EIO;
         }
 
         return len;
@@ -1548,7 +1553,7 @@ init_tmds(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
 
         reg = get_tmds_index_reg(bios->dev, mlv);
         if (!reg)
-                return 0;
+                return -EINVAL;
 
         bios_wr32(bios, reg,
                   tmdsaddr | NV_PRAMDAC_FP_TMDS_CONTROL_WRITE_DISABLE);
@@ -1592,7 +1597,7 @@ init_zm_tmds_group(struct nvbios *bios, uint16_t offset,
 
         reg = get_tmds_index_reg(bios->dev, mlv);
         if (!reg)
-                return 0;
+                return -EINVAL;
 
         for (i = 0; i < count; i++) {
                 uint8_t tmdsaddr = bios->data[offset + 3 + i * 2];
@@ -2067,7 +2072,7 @@ init_configure_mem(struct nvbios *bios, uint16_t offset,
         uint32_t reg, data;
 
         if (bios->major_version > 2)
-                return 0;
+                return -ENODEV;
 
         bios_idxprt_wr(bios, NV_VIO_SRX, NV_VIO_SR_CLOCK_INDEX, bios_idxprt_rd(
                        bios, NV_VIO_SRX, NV_VIO_SR_CLOCK_INDEX) | 0x20);
@@ -2122,7 +2127,7 @@ init_configure_clk(struct nvbios *bios, uint16_t offset,
         int clock;
 
         if (bios->major_version > 2)
-                return 0;
+                return -ENODEV;
 
         clock = ROM16(bios->data[meminitoffs + 4]) * 10;
         setPLL(bios, NV_PRAMDAC_NVPLL_COEFF, clock);
@@ -2155,7 +2160,7 @@ init_configure_preinit(struct nvbios *bios, uint16_t offset,
         uint8_t cr3c = ((straps << 2) & 0xf0) | (straps & (1 << 6));
 
         if (bios->major_version > 2)
-                return 0;
+                return -ENODEV;
 
         bios_idxprt_wr(bios, NV_CIO_CRX__COLOR,
                              NV_CIO_CRE_SCRATCH4__INDEX, cr3c);
@@ -2777,7 +2782,7 @@ init_ram_restrict_zm_reg_group(struct nvbios *bios, uint16_t offset,
                 NV_ERROR(bios->dev,
                          "0x%04X: Zero block length - has the M table "
                          "been parsed?\n", offset);
-                return 0;
+                return -EINVAL;
         }
 
         strap_ramcfg = (bios_rd32(bios, NV_PEXTDEV_BOOT_0) >> 2) & 0xf;
@@ -2961,14 +2966,14 @@ init_auxch(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
 
         if (!bios->display.output) {
                 NV_ERROR(dev, "INIT_AUXCH: no active output\n");
-                return 0;
+                return -EINVAL;
         }
 
         auxch = init_i2c_device_find(dev, bios->display.output->i2c_index);
         if (!auxch) {
                 NV_ERROR(dev, "INIT_AUXCH: couldn't get auxch %d\n",
                          bios->display.output->i2c_index);
-                return 0;
+                return -ENODEV;
         }
 
         if (!iexec->execute)
@@ -2981,7 +2986,7 @@ init_auxch(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
                 ret = nouveau_dp_auxch(auxch, 9, addr, &data, 1);
                 if (ret) {
                         NV_ERROR(dev, "INIT_AUXCH: rd auxch fail %d\n", ret);
-                        return 0;
+                        return ret;
                 }
 
                 data &= bios->data[offset + 0];
@@ -2990,7 +2995,7 @@ init_auxch(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
                 ret = nouveau_dp_auxch(auxch, 8, addr, &data, 1);
                 if (ret) {
                         NV_ERROR(dev, "INIT_AUXCH: wr auxch fail %d\n", ret);
-                        return 0;
+                        return ret;
                 }
         }
 
@@ -3020,14 +3025,14 @@ init_zm_auxch(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
 
         if (!bios->display.output) {
                 NV_ERROR(dev, "INIT_ZM_AUXCH: no active output\n");
-                return 0;
+                return -EINVAL;
         }
 
         auxch = init_i2c_device_find(dev, bios->display.output->i2c_index);
         if (!auxch) {
                 NV_ERROR(dev, "INIT_ZM_AUXCH: couldn't get auxch %d\n",
                          bios->display.output->i2c_index);
-                return 0;
+                return -ENODEV;
         }
 
         if (!iexec->execute)
@@ -3038,7 +3043,7 @@ init_zm_auxch(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
                 ret = nouveau_dp_auxch(auxch, 8, addr, &bios->data[offset], 1);
                 if (ret) {
                         NV_ERROR(dev, "INIT_ZM_AUXCH: wr auxch fail %d\n", ret);
-                        return 0;
+                        return ret;
                 }
         }