[PATCH 1/3] drm/amd/pm: Simplify managed I2C transfer of Aldebaran
Luben Tuikov
luben.tuikov at amd.com
Mon Jun 28 18:48:34 UTC 2021
Simplify Aldebaran managed I2C transfer function
to correctly play with the upper I2C layers.
This gets it in line with Navi10, Acturus, and
Sienna Cichlid.
Cc: Alexander Deucher <Alexander.Deucher at amd.com>
Cc: Andrey Grodzovsky <Andrey.Grodzovsky at amd.com>
Cc: Lijo Lazar <Lijo.Lazar at amd.com>
Cc: John Clements <john.clements at amd.com>
Cc: Hawking Zhang <Hawking.Zhang at amd.com>
Signed-off-by: Luben Tuikov <luben.tuikov at amd.com>
Reviewed-by: Alexander Deucher <Alexander.Deucher at amd.com>
---
.../drm/amd/pm/swsmu/smu13/aldebaran_ppt.c | 230 +++++-------------
1 file changed, 55 insertions(+), 175 deletions(-)
diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/aldebaran_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu13/aldebaran_ppt.c
index 9316a726195cc0..f30edf862b86d1 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu13/aldebaran_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/aldebaran_ppt.c
@@ -1425,197 +1425,77 @@ static bool aldebaran_is_dpm_running(struct smu_context *smu)
return !!(feature_enabled & SMC_DPM_FEATURE);
}
-static void aldebaran_fill_i2c_req(SwI2cRequest_t *req, bool write,
- uint8_t address, uint32_t numbytes,
- uint8_t *data)
-{
- int i;
-
- req->I2CcontrollerPort = 0;
- req->I2CSpeed = 2;
- req->SlaveAddress = address;
- req->NumCmds = numbytes;
-
- for (i = 0; i < numbytes; i++) {
- SwI2cCmd_t *cmd = &req->SwI2cCmds[i];
-
- /* First 2 bytes are always write for lower 2b EEPROM address */
- if (i < 2)
- cmd->CmdConfig = CMDCONFIG_READWRITE_MASK;
- else
- cmd->CmdConfig = write ? CMDCONFIG_READWRITE_MASK : 0;
-
-
- /* Add RESTART for read after address filled */
- cmd->CmdConfig |= (i == 2 && !write) ? CMDCONFIG_RESTART_MASK : 0;
-
- /* Add STOP in the end */
- cmd->CmdConfig |= (i == (numbytes - 1)) ? CMDCONFIG_STOP_MASK : 0;
-
- /* Fill with data regardless if read or write to simplify code */
- cmd->ReadWriteData = data[i];
- }
-}
-
-static int aldebaran_i2c_read_data(struct i2c_adapter *control,
- uint8_t address,
- uint8_t *data,
- uint32_t numbytes)
+static int aldebaran_i2c_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg *msg, int num_msgs)
{
- uint32_t i, ret = 0;
- SwI2cRequest_t req;
- struct amdgpu_device *adev = to_amdgpu_device(control);
+ struct amdgpu_device *adev = to_amdgpu_device(i2c_adap);
struct smu_table_context *smu_table = &adev->smu.smu_table;
struct smu_table *table = &smu_table->driver_table;
+ SwI2cRequest_t *req, *res = (SwI2cRequest_t *)table->cpu_addr;
+ int i, j, r, c;
+ u16 dir;
- if (numbytes > MAX_SW_I2C_COMMANDS) {
- dev_err(adev->dev, "numbytes requested %d is over max allowed %d\n",
- numbytes, MAX_SW_I2C_COMMANDS);
- return -EINVAL;
- }
-
- memset(&req, 0, sizeof(req));
- aldebaran_fill_i2c_req(&req, false, address, numbytes, data);
-
- mutex_lock(&adev->smu.mutex);
- /* Now read data starting with that address */
- ret = smu_cmn_update_table(&adev->smu, SMU_TABLE_I2C_COMMANDS, 0, &req,
- true);
- mutex_unlock(&adev->smu.mutex);
-
- if (!ret) {
- SwI2cRequest_t *res = (SwI2cRequest_t *)table->cpu_addr;
-
- /* Assume SMU fills res.SwI2cCmds[i].Data with read bytes */
- for (i = 0; i < numbytes; i++)
- data[i] = res->SwI2cCmds[i].ReadWriteData;
-
- dev_dbg(adev->dev, "aldebaran_i2c_read_data, address = %x, bytes = %d, data :",
- (uint16_t)address, numbytes);
-
- print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE,
- 8, 1, data, numbytes, false);
- } else
- dev_err(adev->dev, "aldebaran_i2c_read_data - error occurred :%x", ret);
+ req = kzalloc(sizeof(*req), GFP_KERNEL);
+ if (!req)
+ return -ENOMEM;
- return ret;
-}
+ req->I2CcontrollerPort = 0;
+ req->I2CSpeed = I2C_SPEED_FAST_400K;
+ req->SlaveAddress = msg[0].addr << 1; /* wants an 8-bit address */
+ dir = msg[0].flags & I2C_M_RD;
+
+ for (c = i = 0; i < num_msgs; i++) {
+ for (j = 0; j < msg[i].len; j++, c++) {
+ SwI2cCmd_t *cmd = &req->SwI2cCmds[c];
+
+ if (!(msg[i].flags & I2C_M_RD)) {
+ /* write */
+ cmd->CmdConfig |= CMDCONFIG_READWRITE_MASK;
+ cmd->ReadWriteData = msg[i].buf[j];
+ }
-static int aldebaran_i2c_write_data(struct i2c_adapter *control,
- uint8_t address,
- uint8_t *data,
- uint32_t numbytes)
-{
- uint32_t ret;
- SwI2cRequest_t req;
- struct amdgpu_device *adev = to_amdgpu_device(control);
+ if ((dir ^ msg[i].flags) & I2C_M_RD) {
+ /* The direction changes.
+ */
+ dir = msg[i].flags & I2C_M_RD;
+ cmd->CmdConfig |= CMDCONFIG_RESTART_MASK;
+ }
- if (numbytes > MAX_SW_I2C_COMMANDS) {
- dev_err(adev->dev, "numbytes requested %d is over max allowed %d\n",
- numbytes, MAX_SW_I2C_COMMANDS);
- return -EINVAL;
+ req->NumCmds++;
+
+ /*
+ * Insert STOP if we are at the last byte of either last
+ * message for the transaction or the client explicitly
+ * requires a STOP at this particular message.
+ */
+ if ((j == msg[i].len - 1) &&
+ ((i == num_msgs - 1) || (msg[i].flags & I2C_M_STOP))) {
+ cmd->CmdConfig &= ~CMDCONFIG_RESTART_MASK;
+ cmd->CmdConfig |= CMDCONFIG_STOP_MASK;
+ }
+ }
}
-
- memset(&req, 0, sizeof(req));
- aldebaran_fill_i2c_req(&req, true, address, numbytes, data);
-
mutex_lock(&adev->smu.mutex);
- ret = smu_cmn_update_table(&adev->smu, SMU_TABLE_I2C_COMMANDS, 0, &req, true);
+ r = smu_cmn_update_table(&adev->smu, SMU_TABLE_I2C_COMMANDS, 0, req, true);
mutex_unlock(&adev->smu.mutex);
+ if (r)
+ goto fail;
- if (!ret) {
- dev_dbg(adev->dev, "aldebaran_i2c_write(), address = %x, bytes = %d , data: ",
- (uint16_t)address, numbytes);
-
- print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE,
- 8, 1, data, numbytes, false);
- /*
- * According to EEPROM spec there is a MAX of 10 ms required for
- * EEPROM to flush internal RX buffer after STOP was issued at the
- * end of write transaction. During this time the EEPROM will not be
- * responsive to any more commands - so wait a bit more.
- */
- msleep(10);
-
- } else
- dev_err(adev->dev, "aldebaran_i2c_write- error occurred :%x", ret);
-
- return ret;
-}
-
-static int aldebaran_i2c_xfer(struct i2c_adapter *i2c_adap,
- struct i2c_msg *msgs, int num)
-{
- uint32_t i, j, ret, data_size, data_chunk_size, next_eeprom_addr = 0;
- uint8_t *data_ptr, data_chunk[MAX_SW_I2C_COMMANDS] = { 0 };
-
- for (i = 0; i < num; i++) {
- /*
- * SMU interface allows at most MAX_SW_I2C_COMMANDS bytes of data at
- * once and hence the data needs to be spliced into chunks and sent each
- * chunk separately
- */
- data_size = msgs[i].len - 2;
- data_chunk_size = MAX_SW_I2C_COMMANDS - 2;
- next_eeprom_addr = (msgs[i].buf[0] << 8 & 0xff00) | (msgs[i].buf[1] & 0xff);
- data_ptr = msgs[i].buf + 2;
-
- for (j = 0; j < data_size / data_chunk_size; j++) {
- /* Insert the EEPROM dest addess, bits 0-15 */
- data_chunk[0] = ((next_eeprom_addr >> 8) & 0xff);
- data_chunk[1] = (next_eeprom_addr & 0xff);
-
- if (msgs[i].flags & I2C_M_RD) {
- ret = aldebaran_i2c_read_data(i2c_adap,
- (uint8_t)msgs[i].addr,
- data_chunk, MAX_SW_I2C_COMMANDS);
-
- memcpy(data_ptr, data_chunk + 2, data_chunk_size);
- } else {
-
- memcpy(data_chunk + 2, data_ptr, data_chunk_size);
-
- ret = aldebaran_i2c_write_data(i2c_adap,
- (uint8_t)msgs[i].addr,
- data_chunk, MAX_SW_I2C_COMMANDS);
- }
-
- if (ret) {
- num = -EIO;
- goto fail;
- }
-
- next_eeprom_addr += data_chunk_size;
- data_ptr += data_chunk_size;
+ for (c = i = 0; i < num_msgs; i++) {
+ if (!(msg[i].flags & I2C_M_RD)) {
+ c += msg[i].len;
+ continue;
}
+ for (j = 0; j < msg[i].len; j++, c++) {
+ SwI2cCmd_t *cmd = &res->SwI2cCmds[c];
- if (data_size % data_chunk_size) {
- data_chunk[0] = ((next_eeprom_addr >> 8) & 0xff);
- data_chunk[1] = (next_eeprom_addr & 0xff);
-
- if (msgs[i].flags & I2C_M_RD) {
- ret = aldebaran_i2c_read_data(i2c_adap,
- (uint8_t)msgs[i].addr,
- data_chunk, (data_size % data_chunk_size) + 2);
-
- memcpy(data_ptr, data_chunk + 2, data_size % data_chunk_size);
- } else {
- memcpy(data_chunk + 2, data_ptr, data_size % data_chunk_size);
-
- ret = aldebaran_i2c_write_data(i2c_adap,
- (uint8_t)msgs[i].addr,
- data_chunk, (data_size % data_chunk_size) + 2);
- }
-
- if (ret) {
- num = -EIO;
- goto fail;
- }
+ msg[i].buf[j] = cmd->ReadWriteData;
}
}
-
+ r = num_msgs;
fail:
- return num;
+ kfree(req);
+ return r;
}
static u32 aldebaran_i2c_func(struct i2c_adapter *adap)
--
2.32.0
More information about the amd-gfx
mailing list