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Message-ID: <e80cdb17-c656-49aa-bc33-2a4352291067@amd.com>
Date: Wed, 28 Jan 2026 14:06:24 +0530
From: "Mukunda,Vijendar" <vijendar.mukunda@....com>
To: Vinod Koul <vkoul@...nel.org>
Cc: yung-chuan.liao@...ux.intel.com, pierre-louis.bossart@...ux.dev,
Sunil-kumar.Dommati@....com, Mario.Limonciello@....com,
venkataprasad.potturu@....com, linux-sound@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 1/2] soundwire: amd: add clock init control function
On 1/28/26 14:01, Vinod Koul wrote:
> On 23-01-26, 16:41, Vijendar Mukunda wrote:
>> Add generic SoundWire clock initialization sequence to support
>> different SoundWire bus clock frequencies for ACP6.3/7.0/7.1/7.2
>> platforms and remove hard coding initializations for 12Mhz bus
>> clock frequency.
>>
>> Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@....com>
>> ---
>> drivers/soundwire/amd_manager.c | 56 ++++++++++++++++++++++++++++-----
>> drivers/soundwire/amd_manager.h | 4 ---
>> 2 files changed, 49 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/soundwire/amd_manager.c b/drivers/soundwire/amd_manager.c
>> index 5fd311ee4107..ee3c37a5a48b 100644
>> --- a/drivers/soundwire/amd_manager.c
>> +++ b/drivers/soundwire/amd_manager.c
>> @@ -27,6 +27,49 @@
>>
>> #define to_amd_sdw(b) container_of(b, struct amd_sdw_manager, bus)
>>
>> +static int amd_sdw_clk_init_ctrl(struct amd_sdw_manager *amd_manager)
>> +{
>> + struct sdw_bus *bus = &amd_manager->bus;
>> + struct sdw_master_prop *prop = &bus->prop;
>> + u32 val;
>> + int divider;
>> +
>> + dev_dbg(amd_manager->dev, "mclk %d max %d row %d col %d frame_rate:%d\n",
>> + prop->mclk_freq, prop->max_clk_freq, prop->default_row,
>> + prop->default_col, prop->default_frame_rate);
>> +
>> + if (!prop->default_frame_rate || !prop->default_row) {
>> + dev_err(amd_manager->dev, "Default frame_rate %d or row %d is invalid\n",
>> + prop->default_frame_rate, prop->default_row);
>> + return -EINVAL;
>> + }
>> +
>> + /* Set clock divider */
>> + dev_dbg(amd_manager->dev, "bus params curr_dr_freq: %d\n",
>> + bus->params.curr_dr_freq);
>> + divider = (prop->mclk_freq / bus->params.curr_dr_freq);
>> +
>> + writel(divider, amd_manager->mmio + ACP_SW_CLK_FREQUENCY_CTRL);
>> + val = readl(amd_manager->mmio + ACP_SW_CLK_FREQUENCY_CTRL);
>> + dev_dbg(amd_manager->dev, "ACP_SW_CLK_FREQUENCY_CTRL:0x%x\n", val);
>> +
>> + /* Set frame shape base on the actual bus frequency. */
>> + prop->default_col = bus->params.curr_dr_freq /
>> + prop->default_frame_rate / prop->default_row;
>> +
>> + dev_dbg(amd_manager->dev, "default_frame_rate:%d default_row: %d default_col: %d\n",
>> + prop->default_frame_rate, prop->default_row, prop->default_col);
>> + amd_manager->cols_index = sdw_find_col_index(prop->default_col);
>> + amd_manager->rows_index = sdw_find_row_index(prop->default_row);
>> + bus->params.col = prop->default_col;
>> + bus->params.row = prop->default_row;
>> + dev_dbg(amd_manager->dev, "rows_index: %d cols_index: %d\n",
>> + amd_manager->rows_index, amd_manager->cols_index);
>> + dev_dbg(amd_manager->dev, "params.col:0x%x params.row:0x%x\n",
>> + bus->params.col, bus->params.row);
> Too many debug statements in this. These are good for initial debug and
> bringup but very noisy in real production. I would add the applied
> parameters for logging
Will drop these debug logs and re-spin the patch series.
>
>> + return 0;
>> +}
>> +
>> static int amd_init_sdw_manager(struct amd_sdw_manager *amd_manager)
>> {
>> u32 val;
>> @@ -961,6 +1004,9 @@ int amd_sdw_manager_start(struct amd_sdw_manager *amd_manager)
>>
>> prop = &amd_manager->bus.prop;
>> if (!prop->hw_disabled) {
>> + ret = amd_sdw_clk_init_ctrl(amd_manager);
>> + if (ret)
>> + return ret;
>> ret = amd_init_sdw_manager(amd_manager);
>> if (ret)
>> return ret;
>> @@ -985,7 +1031,6 @@ static int amd_sdw_manager_probe(struct platform_device *pdev)
>> struct resource *res;
>> struct device *dev = &pdev->dev;
>> struct sdw_master_prop *prop;
>> - struct sdw_bus_params *params;
>> struct amd_sdw_manager *amd_manager;
>> int ret;
>>
>> @@ -1049,14 +1094,8 @@ static int amd_sdw_manager_probe(struct platform_device *pdev)
>> return -EINVAL;
>> }
>>
>> - params = &amd_manager->bus.params;
>> -
>> - params->col = AMD_SDW_DEFAULT_COLUMNS;
>> - params->row = AMD_SDW_DEFAULT_ROWS;
>> prop = &amd_manager->bus.prop;
>> - prop->clk_freq = &amd_sdw_freq_tbl[0];
>> prop->mclk_freq = AMD_SDW_BUS_BASE_FREQ;
>> - prop->max_clk_freq = AMD_SDW_DEFAULT_CLK_FREQ;
>>
>> ret = sdw_bus_master_add(&amd_manager->bus, dev, dev->fwnode);
>> if (ret) {
>> @@ -1348,6 +1387,9 @@ static int __maybe_unused amd_resume_runtime(struct device *dev)
>> }
>> }
>> sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
>> + ret = amd_sdw_clk_init_ctrl(amd_manager);
>> + if (ret)
>> + return ret;
>> amd_init_sdw_manager(amd_manager);
>> amd_enable_sdw_interrupts(amd_manager);
>> ret = amd_enable_sdw_manager(amd_manager);
>> diff --git a/drivers/soundwire/amd_manager.h b/drivers/soundwire/amd_manager.h
>> index 6cc916b0c820..88cf8a426a0c 100644
>> --- a/drivers/soundwire/amd_manager.h
>> +++ b/drivers/soundwire/amd_manager.h
>> @@ -203,10 +203,6 @@
>> #define AMD_SDW_DEVICE_STATE_D3 3
>> #define ACP_PME_EN 0x0001400
>>
>> -static u32 amd_sdw_freq_tbl[AMD_SDW_MAX_FREQ_NUM] = {
>> - AMD_SDW_DEFAULT_CLK_FREQ,
>> -};
>> -
>> struct sdw_manager_dp_reg {
>> u32 frame_fmt_reg;
>> u32 sample_int_reg;
>> --
>> 2.45.2
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