[PATCH 2/4] drm/amd/powerplay: Add EEPROM I2C read/write support to Arcturus.
Chen, Guchun
Guchun.Chen at amd.com
Mon Oct 21 01:44:48 UTC 2019
Comment inline.
Regards,
Guchun
-----Original Message-----
From: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
Sent: Saturday, October 19, 2019 4:48 AM
To: amd-gfx at lists.freedesktop.org
Cc: Chen, Guchun <Guchun.Chen at amd.com>; Zhou1, Tao <Tao.Zhou1 at amd.com>; Deucher, Alexander <Alexander.Deucher at amd.com>; noreply-confluence at amd.com; Quan, Evan <Evan.Quan at amd.com>; Grodzovsky, Andrey <Andrey.Grodzovsky at amd.com>
Subject: [PATCH 2/4] drm/amd/powerplay: Add EEPROM I2C read/write support to Arcturus.
The communication is done through SMU table and hence the code is in powerplay.
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
---
drivers/gpu/drm/amd/powerplay/arcturus_ppt.c | 229 +++++++++++++++++++++++++++
1 file changed, 229 insertions(+)
diff --git a/drivers/gpu/drm/amd/powerplay/arcturus_ppt.c b/drivers/gpu/drm/amd/powerplay/arcturus_ppt.c
index 90d871a..53d08de5 100644
--- a/drivers/gpu/drm/amd/powerplay/arcturus_ppt.c
+++ b/drivers/gpu/drm/amd/powerplay/arcturus_ppt.c
@@ -36,6 +36,11 @@
#include "smu_v11_0_pptable.h"
#include "arcturus_ppsmc.h"
#include "nbio/nbio_7_4_sh_mask.h"
+#include <linux/i2c.h>
+#include <linux/pci.h>
+#include "amdgpu_ras.h"
+
+#define to_amdgpu_device(x) (container_of(x, struct amdgpu_ras,
+eeprom_control.eeprom_accessor))->adev
#define CTF_OFFSET_EDGE 5
#define CTF_OFFSET_HOTSPOT 5
@@ -171,6 +176,7 @@ static struct smu_11_0_cmn2aisc_mapping arcturus_table_map[SMU_TABLE_COUNT] = {
TAB_MAP(SMU_METRICS),
TAB_MAP(DRIVER_SMU_CONFIG),
TAB_MAP(OVERDRIVE),
+ TAB_MAP(I2C_COMMANDS),
};
static struct smu_11_0_cmn2aisc_mapping arcturus_pwr_src_map[SMU_POWER_SOURCE_COUNT] = { @@ -293,6 +299,9 @@ static int arcturus_tables_init(struct smu_context *smu, struct smu_table *table
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->metrics_table = kzalloc(sizeof(SmuMetrics_t), GFP_KERNEL);
if (!smu_table->metrics_table)
return -ENOMEM;
@@ -1927,6 +1936,224 @@ static int arcturus_dpm_set_uvd_enable(struct smu_context *smu, bool enable)
return ret;
}
+
+static void arcturus_fill_eeprom_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 arcturus_i2c_eeprom_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->tables[SMU_TABLE_I2C_COMMANDS];
+
+ memset(&req, 0, sizeof(req));
+ arcturus_fill_eeprom_i2c_req(&req, false, address, numbytes, data);
+
+ mutex_lock(&adev->smu.mutex);
+ /* Now read data starting with that address */
+ ret = smu_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;
+
+ pr_debug("arcturus_i2c_eeprom_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
+ pr_err("arcturus_i2c_eeprom_read_data - error occurred :%x", ret);
+
+ return ret;
+}
+
+static int arcturus_i2c_eeprom_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));
+ arcturus_fill_eeprom_i2c_req(&req, true, address, numbytes, data);
+
+ mutex_lock(&adev->smu.mutex);
+ ret = smu_update_table(&adev->smu, SMU_TABLE_I2C_COMMANDS, 0, &req, true);
+ mutex_unlock(&adev->smu.mutex);
+
+ if (!ret) {
+ pr_debug("arcturus_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
+ pr_err("arcturus_i2c_write- error occurred :%x", ret);
+
+ return ret;
+}
+
+static int arcturus_i2c_eeprom_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 = arcturus_i2c_eeprom_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 = arcturus_i2c_eeprom_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 = arcturus_i2c_eeprom_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 = arcturus_i2c_eeprom_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 arcturus_i2c_eeprom_i2c_func(struct i2c_adapter *adap) {
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; }
+
+
+static const struct i2c_algorithm arcturus_i2c_eeprom_i2c_algo = {
+ .master_xfer = arcturus_i2c_eeprom_i2c_xfer,
+ .functionality = arcturus_i2c_eeprom_i2c_func,
+};
+
+int arcturus_i2c_eeprom_control_init(struct i2c_adapter *control)
+{
+ struct amdgpu_device *adev = to_amdgpu_device(control);
+ int res;
+
+ control->owner = THIS_MODULE;
+ control->class = I2C_CLASS_SPD;
+ control->dev.parent = &adev->pdev->dev;
+ control->algo = &arcturus_i2c_eeprom_i2c_algo;
+ snprintf(control->name, sizeof(control->name), "RAS EEPROM");
+
+ res = i2c_add_adapter(control);
+ if (res)
+ DRM_ERROR("Failed to register hw i2c, err: %d\n", res);
+
+ return res;
+}
[Guchun]Can we move this register code to one common file? As I saw on vega20, we have the same code smu_v11_0_i2c_eeprom_control_init to register i2c device.
If we can move such code to a common file, then in each asic's i2c code, what we should do is to pass necessary ptrs/name/ops to that common file, and from there, we will register i2c device.
This can help clean some code, whatever, maybe convenient to other asics if we want to do the same i2c adding job.
+void arcturus_i2c_eeprom_control_fini(struct i2c_adapter *control)
+{
+ i2c_del_adapter(control);
+}
+
[Guchun]The same as above.
static const struct pptable_funcs arcturus_ppt_funcs = {
/* translate smu index into arcturus specific index */
.get_smu_msg_index = arcturus_get_smu_msg_index,
@@ -1966,6 +2193,8 @@ static const struct pptable_funcs arcturus_ppt_funcs = {
.get_power_limit = arcturus_get_power_limit,
.is_dpm_running = arcturus_is_dpm_running,
.dpm_set_uvd_enable = arcturus_dpm_set_uvd_enable,
+ .i2c_eeprom_init = arcturus_i2c_eeprom_control_init,
+ .i2c_eeprom_fini = arcturus_i2c_eeprom_control_fini,
};
void arcturus_set_ppt_funcs(struct smu_context *smu)
--
2.7.4
More information about the amd-gfx
mailing list