linux-kernel - Re: [PATCH 04/12] drivers: soundwire: refactor soundwire pads enable

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Date: Thu, 21 Dec 2023 22:08:41 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Vijendar Mukunda <Vijendar.Mukunda@....com>
Cc: broonie@...nel.org, alsa-devel@...a-project.org,
	Basavaraj.Hiregoudar@....com, Sunil-kumar.Dommati@....com,
	pierre-louis.bossart@...ux.intel.com, vinod.koul@...el.com,
	venkataprasad.potturu@....com,
	Bard Liao <yung-chuan.liao@...ux.intel.com>,
	Sanyog Kale <sanyog.r.kale@...el.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 04/12] drivers: soundwire: refactor soundwire pads enable

On 21-12-23, 13:05, Vijendar Mukunda wrote:
> As sdw pads enable sequence is executed only once, invoke it
> from probe sequence.
> 
> Program required pads for both manager instances
> based on link_mask during probe sequence. This will avoid
> acquiring mutex lock.

something wrong with your editor to have this formatting, you can use
upto 80 chars here!


> Remove unnecessary delay after programming ACP_SW_PAD_KEEPER_EN
> register.
> 
> Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@....com>
> ---
>  drivers/soundwire/amd_init.c    | 45 +++++++++++++++++++++++++++++++++
>  drivers/soundwire/amd_manager.c | 18 -------------
>  2 files changed, 45 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/soundwire/amd_init.c b/drivers/soundwire/amd_init.c
> index 5c9569d9ad01..b3b3c7266384 100644
> --- a/drivers/soundwire/amd_init.c
> +++ b/drivers/soundwire/amd_init.c
> @@ -15,6 +15,47 @@
>  
>  #include "amd_init.h"
>  
> +#define ACP_PAD_PULLDOWN_CTRL				0x0001448
> +#define ACP_SW_PAD_KEEPER_EN				0x0001454
> +#define AMD_SDW_PAD_PULLDOWN_CTRL_ENABLE_MASK		0x7f9a
> +#define AMD_SDW0_PAD_PULLDOWN_CTRL_ENABLE_MASK		0x7f9f
> +#define AMD_SDW1_PAD_PULLDOWN_CTRL_ENABLE_MASK		0x7ffa
> +#define AMD_SDW0_PAD_EN_MASK				1
> +#define AMD_SDW1_PAD_EN_MASK				0x10
> +#define AMD_SDW_PAD_EN_MASK	(AMD_SDW0_PAD_EN_MASK | AMD_SDW1_PAD_EN_MASK)
> +
> +static int amd_enable_sdw_pads(void __iomem *mmio, u32 link_mask, struct device *dev)
> +{
> +	u32 val;
> +	u32 pad_keeper_en_mask, pad_pulldown_ctrl_mask;
> +
> +	switch (link_mask) {
> +	case 1:
> +		pad_keeper_en_mask = AMD_SDW0_PAD_EN_MASK;
> +		pad_pulldown_ctrl_mask = AMD_SDW0_PAD_PULLDOWN_CTRL_ENABLE_MASK;
> +		break;
> +	case 2:
> +		pad_keeper_en_mask = AMD_SDW1_PAD_EN_MASK;
> +		pad_pulldown_ctrl_mask = AMD_SDW1_PAD_PULLDOWN_CTRL_ENABLE_MASK;
> +		break;
> +	case 3:
> +		pad_keeper_en_mask = AMD_SDW_PAD_EN_MASK;
> +		pad_pulldown_ctrl_mask = AMD_SDW_PAD_PULLDOWN_CTRL_ENABLE_MASK;
> +		break;
> +	default:
> +		dev_err(dev, "No SDW Links are enabled\n");
> +		return -ENODEV;
> +	}
> +
> +	val = readl(mmio + ACP_SW_PAD_KEEPER_EN);
> +	val |= pad_keeper_en_mask;
> +	writel(val, mmio + ACP_SW_PAD_KEEPER_EN);
> +	val = readl(mmio + ACP_PAD_PULLDOWN_CTRL);
> +	val &= pad_pulldown_ctrl_mask;
> +	writel(val, mmio + ACP_PAD_PULLDOWN_CTRL);

updatel() local macro?

> +	return 0;
> +}
> +
>  static int sdw_amd_cleanup(struct sdw_amd_ctx *ctx)
>  {
>  	int i;
> @@ -37,6 +78,7 @@ static struct sdw_amd_ctx *sdw_amd_probe_controller(struct sdw_amd_res *res)
>  	struct platform_device_info pdevinfo[2];
>  	u32 link_mask;
>  	int count, index;
> +	int ret;
>  
>  	if (!res)
>  		return NULL;
> @@ -50,6 +92,9 @@ static struct sdw_amd_ctx *sdw_amd_probe_controller(struct sdw_amd_res *res)
>  
>  	count = res->count;
>  	dev_dbg(&adev->dev, "Creating %d SDW Link devices\n", count);
> +	ret = amd_enable_sdw_pads(res->mmio_base, res->link_mask, res->parent);
> +	if (ret)
> +		return NULL;
>  
>  	/*
>  	 * we need to alloc/free memory manually and can't use devm:
> diff --git a/drivers/soundwire/amd_manager.c b/drivers/soundwire/amd_manager.c
> index c27b0b0f33a6..1427cccfc309 100644
> --- a/drivers/soundwire/amd_manager.c
> +++ b/drivers/soundwire/amd_manager.c
> @@ -26,23 +26,6 @@
>  
>  #define to_amd_sdw(b)	container_of(b, struct amd_sdw_manager, bus)
>  
> -static void amd_enable_sdw_pads(struct amd_sdw_manager *amd_manager)
> -{
> -	u32 sw_pad_pulldown_val;
> -	u32 val;
> -
> -	mutex_lock(amd_manager->acp_sdw_lock);
> -	val = readl(amd_manager->acp_mmio + ACP_SW_PAD_KEEPER_EN);
> -	val |= amd_manager->reg_mask->sw_pad_enable_mask;
> -	writel(val, amd_manager->acp_mmio + ACP_SW_PAD_KEEPER_EN);
> -	usleep_range(1000, 1500);
> -
> -	sw_pad_pulldown_val = readl(amd_manager->acp_mmio + ACP_PAD_PULLDOWN_CTRL);
> -	sw_pad_pulldown_val &= amd_manager->reg_mask->sw_pad_pulldown_mask;
> -	writel(sw_pad_pulldown_val, amd_manager->acp_mmio + ACP_PAD_PULLDOWN_CTRL);
> -	mutex_unlock(amd_manager->acp_sdw_lock);

so the code is copied from a GPL declared file to now and GPL + BSD one!
Have you had lawyers look into this... why change one file license ?

> -}
> -
>  static int amd_init_sdw_manager(struct amd_sdw_manager *amd_manager)
>  {
>  	u32 val;
> @@ -872,7 +855,6 @@ int amd_sdw_manager_start(struct amd_sdw_manager *amd_manager)
>  
>  	prop = &amd_manager->bus.prop;
>  	if (!prop->hw_disabled) {
> -		amd_enable_sdw_pads(amd_manager);
>  		ret = amd_init_sdw_manager(amd_manager);
>  		if (ret)
>  			return ret;
> -- 
> 2.34.1

-- 
~Vinod