linux-kernel - [PATCH 1/3] ASoC: amd: ps: add mutex lock for accessing common registers

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Date:   Wed, 4 Jan 2023 11:24:29 +0530
From:   Vijendar Mukunda <Vijendar.Mukunda@....com>
To:     <broonie@...nel.org>, <alsa-devel@...a-project.org>,
        <syed.sabakareem@....com>
CC:     <Sunil-kumar.Dommati@....com>, <mario.limonciello@....com>,
        <basavaraj.hiregoudar@....com>,
        Vijendar Mukunda <Vijendar.Mukunda@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Syed Saba Kareem <Syed.SabaKareem@....com>,
        open list <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/3] ASoC: amd: ps: add mutex lock for accessing common registers

Add mutex lock for accessing ACP common registers across different
modules.

Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@....com>
---
 sound/soc/amd/ps/acp63.h  | 1 +
 sound/soc/amd/ps/pci-ps.c | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/sound/soc/amd/ps/acp63.h b/sound/soc/amd/ps/acp63.h
index 8f024cb309c9..47854280dd4b 100644
--- a/sound/soc/amd/ps/acp63.h
+++ b/sound/soc/amd/ps/acp63.h
@@ -106,6 +106,7 @@ struct acp63_dev_data {
 	struct resource *res;
 	bool acp63_audio_mode;
 	struct platform_device *pdev[ACP63_DEVS];
+	struct mutex acp_lock; /* protect shared registers */
 	u16 pdev_mask;
 	u16 pdev_count;
 	u16 pdm_dev_index;
diff --git a/sound/soc/amd/ps/pci-ps.c b/sound/soc/amd/ps/pci-ps.c
index 401cfd0036be..6335595ec5b9 100644
--- a/sound/soc/amd/ps/pci-ps.c
+++ b/sound/soc/amd/ps/pci-ps.c
@@ -209,7 +209,8 @@ static int create_acp63_platform_devs(struct pci_dev *pci, struct acp63_dev_data
 	case ACP63_PDM_DEV_MASK:
 		adata->pdm_dev_index  = 0;
 		acp63_fill_platform_dev_info(&pdevinfo[0], parent, NULL, "acp_ps_pdm_dma",
-					     0, adata->res, 1, NULL, 0);
+					     0, adata->res, 1, &adata->acp_lock,
+					     sizeof(adata->acp_lock));
 		acp63_fill_platform_dev_info(&pdevinfo[1], parent, NULL, "dmic-codec",
 					     0, NULL, 0, NULL, 0);
 		acp63_fill_platform_dev_info(&pdevinfo[2], parent, NULL, "acp_ps_mach",
@@ -283,6 +284,7 @@ static int snd_acp63_probe(struct pci_dev *pci,
 	}
 	pci_set_master(pci);
 	pci_set_drvdata(pci, adata);
+	mutex_init(&adata->acp_lock);
 	ret = acp63_init(adata->acp63_base, &pci->dev);
 	if (ret)
 		goto release_regions;
-- 
2.34.1