linux-kernel - Re: [PATCH 2/2] ASoC: SOF: amd: refactor PSP smn

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Date:   Wed, 12 Jul 2023 16:38:46 +0530
From:   Mastan Katragadda <mastan.katragadda@....com>
To:     "broonie@...nel.org" <broonie@...nel.org>
Cc:     "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "Hiregoudar, Basavaraj" <Basavaraj.Hiregoudar@....com>,
        "Dommati, Sunil-kumar" <Sunil-kumar.Dommati@....com>,
        "Mukunda, Vijendar" <Vijendar.Mukunda@....com>,
        "kondaveeti, Arungopal" <Arungopal.kondaveeti@....com>,
        "Reddy, V sujith kumar" <Vsujithkumar.Reddy@....com>,
        "Prasad, Prasad" <venkataprasad.potturu@....com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Daniel Baluta <daniel.baluta@....com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Ajye Huang <ajye_huang@...pal.corp-partner.google.com>,
        Ajit Kumar Pandey <AjitKumar.Pandey@....com>,
        Paul Olaru <paul.olaru@....com>,
        "moderated list:SOUND - SOUND OPEN FIRMWARE (SOF) DRIVERS" 
        <sound-open-firmware@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] ASoC: SOF: amd: refactor PSP smn_read


On 30/06/23 12:35, Mastan Katragadda wrote:
> Use the read_poll_timeout marco for PSP smn_read calls.
This patch has not been merged.
>
> Signed-off-by: Mastan Katragadda <Mastan.Katragadda@....com>
> ---
>   sound/soc/sof/amd/acp.c | 34 +++++++++++++++-------------------
>   sound/soc/sof/amd/acp.h |  4 ++--
>   2 files changed, 17 insertions(+), 21 deletions(-)
>
> diff --git a/sound/soc/sof/amd/acp.c b/sound/soc/sof/amd/acp.c
> index afb505461ea1..c450931ae77e 100644
> --- a/sound/soc/sof/amd/acp.c
> +++ b/sound/soc/sof/amd/acp.c
> @@ -28,12 +28,14 @@ static int smn_write(struct pci_dev *dev, u32 smn_addr, u32 data)
>   	return 0;
>   }
>   
> -static int smn_read(struct pci_dev *dev, u32 smn_addr, u32 *data)
> +static int smn_read(struct pci_dev *dev, u32 smn_addr)
>   {
> +	u32 data = 0;
> +
>   	pci_write_config_dword(dev, 0x60, smn_addr);
> -	pci_read_config_dword(dev, 0x64, data);
> +	pci_read_config_dword(dev, 0x64, &data);
>   
> -	return 0;
> +	return data;
>   }
>   
>   static void init_dma_descriptor(struct acp_dev_data *adata)
> @@ -150,15 +152,13 @@ int configure_and_run_dma(struct acp_dev_data *adata, unsigned int src_addr,
>   static int psp_mbox_ready(struct acp_dev_data *adata, bool ack)
>   {
>   	struct snd_sof_dev *sdev = adata->dev;
> -	int timeout;
> +	int ret;
>   	u32 data;
>   
> -	for (timeout = ACP_PSP_TIMEOUT_COUNTER; timeout > 0; timeout--) {
> -		msleep(20);
> -		smn_read(adata->smn_dev, MP0_C2PMSG_114_REG, &data);
> -		if (data & MBOX_READY_MASK)
> -			return 0;
> -	}
> +	ret = read_poll_timeout(smn_read, data, data & MBOX_READY_MASK, MBOX_DELAY_US,
> +				ACP_PSP_TIMEOUT_US, false, adata->smn_dev, MP0_C2PMSG_114_REG);
> +	if (!ret)
> +		return 0;
>   
>   	dev_err(sdev->dev, "PSP error status %x\n", data & MBOX_STATUS_MASK);
>   
> @@ -177,23 +177,19 @@ static int psp_mbox_ready(struct acp_dev_data *adata, bool ack)
>   static int psp_send_cmd(struct acp_dev_data *adata, int cmd)
>   {
>   	struct snd_sof_dev *sdev = adata->dev;
> -	int ret, timeout;
> +	int ret;
>   	u32 data;
>   
>   	if (!cmd)
>   		return -EINVAL;
>   
>   	/* Get a non-zero Doorbell value from PSP */
> -	for (timeout = ACP_PSP_TIMEOUT_COUNTER; timeout > 0; timeout--) {
> -		msleep(MBOX_DELAY);
> -		smn_read(adata->smn_dev, MP0_C2PMSG_73_REG, &data);
> -		if (data)
> -			break;
> -	}
> +	ret = read_poll_timeout(smn_read, data, data, MBOX_DELAY_US, ACP_PSP_TIMEOUT_US, false,
> +				adata->smn_dev, MP0_C2PMSG_73_REG);
>   
> -	if (!timeout) {
> +	if (ret) {
>   		dev_err(sdev->dev, "Failed to get Doorbell from MBOX %x\n", MP0_C2PMSG_73_REG);
> -		return -EINVAL;
> +		return ret;
>   	}
>   
>   	/* Check if PSP is ready for new command */
> diff --git a/sound/soc/sof/amd/acp.h b/sound/soc/sof/amd/acp.h
> index dc624f727aa3..c3659dbc3745 100644
> --- a/sound/soc/sof/amd/acp.h
> +++ b/sound/soc/sof/amd/acp.h
> @@ -61,12 +61,12 @@
>   #define HOST_BRIDGE_CZN				0x1630
>   #define HOST_BRIDGE_RMB				0x14B5
>   #define ACP_SHA_STAT				0x8000
> -#define ACP_PSP_TIMEOUT_COUNTER			5
> +#define ACP_PSP_TIMEOUT_US			1000000
>   #define ACP_EXT_INTR_ERROR_STAT			0x20000000
>   #define MP0_C2PMSG_114_REG			0x3810AC8
>   #define MP0_C2PMSG_73_REG			0x3810A24
>   #define MBOX_ACP_SHA_DMA_COMMAND		0x70000
> -#define MBOX_DELAY				1000
> +#define MBOX_DELAY_US				1000
>   #define MBOX_READY_MASK				0x80000000
>   #define MBOX_STATUS_MASK			0xFFFF
>