[PATCH 2/4] drm/amd/powerplay: Add EEPROM I2C read/write support to Arcturus.
Deucher, Alexander
Alexander.Deucher at amd.com
Mon Oct 21 13:46:39 UTC 2019
> -----Original Message-----
> From: Li, Dennis <Dennis.Li at amd.com>
> Sent: Sunday, October 20, 2019 11:02 PM
> To: Grodzovsky, Andrey <Andrey.Grodzovsky at amd.com>; amd-
> gfx at lists.freedesktop.org
> Cc: Grodzovsky, Andrey <Andrey.Grodzovsky at amd.com>; Chen, Guchun
> <Guchun.Chen at amd.com>; Zhou1, Tao <Tao.Zhou1 at amd.com>; noreply-
> confluence at amd.com; Deucher, Alexander
> <Alexander.Deucher at amd.com>; Quan, Evan <Evan.Quan at amd.com>
> Subject: RE: [PATCH 2/4] drm/amd/powerplay: Add EEPROM I2C read/write
> support to Arcturus.
>
> To make the function behavior more clear, It's better to change the function
> declaration from
>
> + static void arcturus_fill_eeprom_i2c_req(SwI2cRequest_t *req, bool write,
> + uint8_t address, uint32_t numbytes,
> + uint8_t *data)
>
> to
>
> +static void arcturus_fill_eeprom_i2c_req(SwI2cRequest_t *req, bool
> write_or_read,
> + uint8_t address, uint32_t numbytes,
> + uint8_t *data)
I'm not sure I agree with that. If the variable is write_or_read then how does the driver code know how to set it? E.g., do you set it for write or for read or both?
Alex
>
> Best Regards
> Dennis Li
> -----Original Message-----
> From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of
> Andrey Grodzovsky
> Sent: Saturday, October 19, 2019 4:48 AM
> To: amd-gfx at lists.freedesktop.org
> Cc: Grodzovsky, Andrey <Andrey.Grodzovsky at amd.com>; Chen, Guchun
> <Guchun.Chen at amd.com>; Zhou1, Tao <Tao.Zhou1 at amd.com>; noreply-
> confluence at amd.com; Deucher, Alexander
> <Alexander.Deucher at amd.com>; Quan, Evan <Evan.Quan 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;
> +}
> +
> +void arcturus_i2c_eeprom_control_fini(struct i2c_adapter *control) {
> + i2c_del_adapter(control);
> +}
> +
> 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
>
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