diff options
| author |   Markus Mayer <mmayer@broadcom.com> | 2019-10-15 15:45:08 -0700 |
|---|---|---|
| committer |   Florian Fainelli <f.fainelli@gmail.com> | 2019-10-18 10:07:29 -0700 |
| commit | 75d316e7633abda6b066d432f92fdb7012988daa (patch) | |
| tree | 7396a2af1b157817ea1f154da05ab0e5b50df07c /drivers/memory | |
| parent | memory: brcmstb: dpfe: initialize priv->dev (diff) | |
| download | linux-dev-75d316e7633abda6b066d432f92fdb7012988daa.tar.xz linux-dev-75d316e7633abda6b066d432f92fdb7012988daa.zip | |
memory: brcmstb: dpfe: add locking around DCPU enable/disable
To ensure consistency, we add locking primitives inside the DCPU enable
and disable routines.
Signed-off-by: Markus Mayer <mmayer@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Diffstat (limited to 'drivers/memory')
| -rw-r--r-- | drivers/memory/brcmstb_dpfe.c | 31 |
1 files changed, 21 insertions, 10 deletions
diff --git a/drivers/memory/brcmstb_dpfe.c b/drivers/memory/brcmstb_dpfe.c index 2ef3e365c1b5..c10c24a76729 100644 --- a/drivers/memory/brcmstb_dpfe.c +++ b/drivers/memory/brcmstb_dpfe.c @@ -290,32 +290,41 @@ static const struct dpfe_api dpfe_api_v3 = { }, }; -static bool is_dcpu_enabled(void __iomem *regs) +static bool is_dcpu_enabled(struct brcmstb_dpfe_priv *priv) { u32 val; - val = readl_relaxed(regs + REG_DCPU_RESET); + mutex_lock(&priv->lock); + val = readl_relaxed(priv->regs + REG_DCPU_RESET); + mutex_unlock(&priv->lock); return !(val & DCPU_RESET_MASK); } -static void __disable_dcpu(void __iomem *regs) +static void __disable_dcpu(struct brcmstb_dpfe_priv *priv) { u32 val; - if (!is_dcpu_enabled(regs)) + if (!is_dcpu_enabled(priv)) return; + mutex_lock(&priv->lock); + /* Put DCPU in reset if it's running. */ - val = readl_relaxed(regs + REG_DCPU_RESET); + val = readl_relaxed(priv->regs + REG_DCPU_RESET); val |= (1 << DCPU_RESET_SHIFT); - writel_relaxed(val, regs + REG_DCPU_RESET); + writel_relaxed(val, priv->regs + REG_DCPU_RESET); + + mutex_unlock(&priv->lock); } -static void __enable_dcpu(void __iomem *regs) +static void __enable_dcpu(struct brcmstb_dpfe_priv *priv) { + void __iomem *regs = priv->regs; u32 val; + mutex_lock(&priv->lock); + /* Clear mailbox registers. */ writel_relaxed(0, regs + REG_TO_DCPU_MBOX); writel_relaxed(0, regs + REG_TO_HOST_MBOX); @@ -329,6 +338,8 @@ static void __enable_dcpu(void __iomem *regs) val = readl_relaxed(regs + REG_DCPU_RESET); val &= ~(1 << DCPU_RESET_SHIFT); writel_relaxed(val, regs + REG_DCPU_RESET); + + mutex_unlock(&priv->lock); } static unsigned int get_msg_chksum(const u32 msg[], unsigned int max) @@ -590,7 +601,7 @@ static int brcmstb_dpfe_download_firmware(struct platform_device *pdev, * Skip downloading the firmware if the DCPU is already running and * responding to commands. */ - if (is_dcpu_enabled(priv->regs)) { + if (is_dcpu_enabled(priv)) { u32 response[MSG_FIELD_MAX]; ret = __send_command(priv, DPFE_CMD_GET_INFO, response); @@ -615,7 +626,7 @@ static int brcmstb_dpfe_download_firmware(struct platform_device *pdev, if (ret) return -EFAULT; - __disable_dcpu(priv->regs); + __disable_dcpu(priv); is_big_endian = init->is_big_endian; dmem_size = init->dmem_len; @@ -641,7 +652,7 @@ static int brcmstb_dpfe_download_firmware(struct platform_device *pdev, if (ret) return ret; - __enable_dcpu(priv->regs); + __enable_dcpu(priv); return 0; } |