From 1bc734759f284eb531dd474c72ce59874649a254 Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Sun, 19 Jul 2020 13:22:05 -0400 Subject: drm/amdgpu/navi1x: add SMU i2c support (v2) Enable SMU i2c bus access for navi1x asics. v2: add missing implementation Reviewed-by: Andrey Grodzovsky Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/powerplay/navi10_ppt.c | 239 +++++++++++++++++++++++++++++ 1 file changed, 239 insertions(+) diff --git a/drivers/gpu/drm/amd/powerplay/navi10_ppt.c b/drivers/gpu/drm/amd/powerplay/navi10_ppt.c index 2512ba17eaaf..6aaf483858a0 100644 --- a/drivers/gpu/drm/amd/powerplay/navi10_ppt.c +++ b/drivers/gpu/drm/amd/powerplay/navi10_ppt.c @@ -25,6 +25,7 @@ #include #include +#include #include "amdgpu.h" #include "amdgpu_smu.h" #include "atomfirmware.h" @@ -55,6 +56,8 @@ #undef pr_info #undef pr_debug +#define to_amdgpu_device(x) (container_of(x, struct amdgpu_device, pm.smu_i2c)) + #define FEATURE_MASK(feature) (1ULL << feature) #define SMC_DPM_FEATURE ( \ FEATURE_MASK(FEATURE_DPM_PREFETCHER_BIT) | \ @@ -460,6 +463,8 @@ static int navi10_tables_init(struct smu_context *smu) PAGE_SIZE, AMDGPU_GEM_DOMAIN_VRAM); SMU_TABLE_INIT(tables, SMU_TABLE_SMU_METRICS, sizeof(SmuMetrics_t), PAGE_SIZE, AMDGPU_GEM_DOMAIN_VRAM); + SMU_TABLE_INIT(tables, SMU_TABLE_I2C_COMMANDS, sizeof(SwI2cRequest_t), + PAGE_SIZE, AMDGPU_GEM_DOMAIN_VRAM); SMU_TABLE_INIT(tables, SMU_TABLE_OVERDRIVE, sizeof(OverDriveTable_t), PAGE_SIZE, AMDGPU_GEM_DOMAIN_VRAM); SMU_TABLE_INIT(tables, SMU_TABLE_PMSTATUSLOG, SMU11_TOOL_SIZE, @@ -2258,11 +2263,245 @@ static int navi10_disable_umc_cdr_12gbps_workaround(struct smu_context *smu) return navi10_dummy_pstate_control(smu, true); } +static void navi10_fill_i2c_req(SwI2cRequest_t *req, bool write, + uint8_t address, uint32_t numbytes, + uint8_t *data) +{ + int i; + + BUG_ON(numbytes > MAX_SW_I2C_COMMANDS); + + 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->Cmd = 1; + else + cmd->Cmd = write; + + + /* 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->RegisterAddr = data[i]; + } +} + +static int navi10_i2c_read_data(struct i2c_adapter *control, + uint8_t address, + uint8_t *data, + uint32_t numbytes) +{ + uint32_t i, ret = 0; + SwI2cRequest_t req; + struct amdgpu_device *adev = to_amdgpu_device(control); + struct smu_table_context *smu_table = &adev->smu.smu_table; + struct smu_table *table = &smu_table->driver_table; + + memset(&req, 0, sizeof(req)); + navi10_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].Data; + + dev_dbg(adev->dev, "navi10_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, "navi10_i2c_read_data - error occurred :%x", ret); + + return ret; +} + +static int navi10_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); + + memset(&req, 0, sizeof(req)); + navi10_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); + mutex_unlock(&adev->smu.mutex); + + if (!ret) { + dev_dbg(adev->dev, "navi10_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, "navi10_i2c_write- error occurred :%x", ret); + + return ret; +} + +static int navi10_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 = navi10_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 = navi10_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; + } + + 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 = navi10_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 = navi10_i2c_write_data(i2c_adap, + (uint8_t)msgs[i].addr, + data_chunk, (data_size % data_chunk_size) + 2); + } + + if (ret) { + num = -EIO; + goto fail; + } + } + } + +fail: + return num; +} + +static u32 navi10_i2c_func(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; +} + + +static const struct i2c_algorithm navi10_i2c_algo = { + .master_xfer = navi10_i2c_xfer, + .functionality = navi10_i2c_func, +}; + +static bool navi10_i2c_adapter_is_added(struct i2c_adapter *control) +{ + struct amdgpu_device *adev = to_amdgpu_device(control); + + return control->dev.parent == &adev->pdev->dev; +} + +static int navi10_i2c_control_init(struct smu_context *smu, struct i2c_adapter *control) +{ + struct amdgpu_device *adev = to_amdgpu_device(control); + int res; + + /* smu_i2c_eeprom_init may be called twice in sriov */ + if (navi10_i2c_adapter_is_added(control)) + return 0; + + control->owner = THIS_MODULE; + control->class = I2C_CLASS_SPD; + control->dev.parent = &adev->pdev->dev; + control->algo = &navi10_i2c_algo; + snprintf(control->name, sizeof(control->name), "AMDGPU SMU"); + + res = i2c_add_adapter(control); + if (res) + DRM_ERROR("Failed to register hw i2c, err: %d\n", res); + + return res; +} + +static void navi10_i2c_control_fini(struct smu_context *smu, struct i2c_adapter *control) +{ + if (!navi10_i2c_adapter_is_added(control)) + return; + + i2c_del_adapter(control); +} + + static const struct pptable_funcs navi10_ppt_funcs = { .get_allowed_feature_mask = navi10_get_allowed_feature_mask, .set_default_dpm_table = navi10_set_default_dpm_table, .dpm_set_vcn_enable = navi10_dpm_set_vcn_enable, .dpm_set_jpeg_enable = navi10_dpm_set_jpeg_enable, + .i2c_init = navi10_i2c_control_init, + .i2c_fini = navi10_i2c_control_fini, .print_clk_levels = navi10_print_clk_levels, .force_clk_levels = navi10_force_clk_levels, .populate_umd_state_clk = navi10_populate_umd_state_clk, -- cgit