linux-kernel - Re: [PATCH V2 1/2] soundwire: amd: add clock init control function

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Message-ID: <eab93ae1-d07f-4b6c-b642-46e0cf307f58@kernel.org>
Date: Tue, 13 Jan 2026 08:59:41 -0600
From: "Mario Limonciello (AMD) (kernel.org)" <superm1@...nel.org>
To: Vijendar Mukunda <Vijendar.Mukunda@....com>, vkoul@...nel.org
Cc: yung-chuan.liao@...ux.intel.com, pierre-louis.bossart@...ux.dev,
 Sunil-kumar.Dommati@....com, linux-sound@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 1/2] soundwire: amd: add clock init control function



On 1/13/2026 8:13 AM, 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>
Reviewed-by: Mario Limonciello (AMD) <superm1@...nel.org>

> ---
>   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);
> +	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;