linux-kernel - Re: [PATCH v2 4/5] soundwire: intel/cadence: add flag for interrupt enable

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Date:   Mon, 21 Oct 2019 09:44:04 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        tiwai@...e.de, broonie@...nel.org, gregkh@...uxfoundation.org,
        jank@...ence.com, srinivas.kandagatla@...aro.org,
        slawomir.blauciak@...el.com,
        Bard liao <yung-chuan.liao@...ux.intel.com>,
        Rander Wang <rander.wang@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: Re: [PATCH v2 4/5] soundwire: intel/cadence: add flag for interrupt
 enable

On 16-09-19, 14:09, Pierre-Louis Bossart wrote:
> Prepare for future PM support and fix error handling by disabling
> interrupts as needed.
> 
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> ---
>  drivers/soundwire/cadence_master.c | 18 ++++++++++++------
>  drivers/soundwire/cadence_master.h |  2 +-
>  drivers/soundwire/intel.c          | 12 +++++++-----
>  3 files changed, 20 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
> index 5f900cf2acb9..a71df99ca18f 100644
> --- a/drivers/soundwire/cadence_master.c
> +++ b/drivers/soundwire/cadence_master.c
> @@ -819,14 +819,17 @@ EXPORT_SYMBOL(sdw_cdns_exit_reset);
>   * sdw_cdns_enable_interrupt() - Enable SDW interrupts and update config
>   * @cdns: Cadence instance
>   */
> -int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns)
> +int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
>  {
> -	u32 mask;
> +	u32 slave_intmask0 = 0;
> +	u32 slave_intmask1 = 0;
> +	u32 mask = 0;
> +
> +	if (!state)
> +		goto update_masks;
>  
> -	cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0,
> -		    CDNS_MCP_SLAVE_INTMASK0_MASK);
> -	cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1,
> -		    CDNS_MCP_SLAVE_INTMASK1_MASK);
> +	slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
> +	slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
>  
>  	/* enable detection of all slave state changes */
>  	mask = CDNS_MCP_INT_SLAVE_MASK;
> @@ -849,6 +852,9 @@ int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns)
>  	if (interrupt_mask) /* parameter override */
>  		mask = interrupt_mask;
>  
> +update_masks:
> +	cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
> +	cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
>  	cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
>  
>  	/* commit changes */
> diff --git a/drivers/soundwire/cadence_master.h b/drivers/soundwire/cadence_master.h
> index 1a67728c5000..302351808098 100644
> --- a/drivers/soundwire/cadence_master.h
> +++ b/drivers/soundwire/cadence_master.h
> @@ -162,7 +162,7 @@ int sdw_cdns_init(struct sdw_cdns *cdns);
>  int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
>  		      struct sdw_cdns_stream_config config);
>  int sdw_cdns_exit_reset(struct sdw_cdns *cdns);
> -int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns);
> +int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state);
>  
>  #ifdef CONFIG_DEBUG_FS
>  void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root);
> diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
> index cdb3243e8823..08530c136c5f 100644
> --- a/drivers/soundwire/intel.c
> +++ b/drivers/soundwire/intel.c
> @@ -1036,7 +1036,7 @@ static int intel_probe(struct platform_device *pdev)
>  	ret = sdw_add_bus_master(&sdw->cdns.bus);
>  	if (ret) {
>  		dev_err(&pdev->dev, "sdw_add_bus_master fail: %d\n", ret);
> -		goto err_master_reg;
> +		return ret;

I am not sure I like this line change, before this IIRC the function and
single place of return, so changing this doesn't seem to improve
anything here..?

>  	}
>  
>  	if (sdw->cdns.bus.prop.hw_disabled) {
> @@ -1067,7 +1067,7 @@ static int intel_probe(struct platform_device *pdev)
>  		goto err_init;
>  	}
>  
> -	ret = sdw_cdns_enable_interrupt(&sdw->cdns);
> +	ret = sdw_cdns_enable_interrupt(&sdw->cdns, true);
>  	if (ret < 0) {
>  		dev_err(sdw->cdns.dev, "cannot enable interrupts\n");
>  		goto err_init;
> @@ -1076,7 +1076,7 @@ static int intel_probe(struct platform_device *pdev)
>  	ret = sdw_cdns_exit_reset(&sdw->cdns);
>  	if (ret < 0) {
>  		dev_err(sdw->cdns.dev, "unable to exit bus reset sequence\n");
> -		goto err_init;
> +		goto err_interrupt;
>  	}
>  
>  	/* Register DAIs */
> @@ -1084,18 +1084,19 @@ static int intel_probe(struct platform_device *pdev)
>  	if (ret) {
>  		dev_err(sdw->cdns.dev, "DAI registration failed: %d\n", ret);
>  		snd_soc_unregister_component(sdw->cdns.dev);
> -		goto err_dai;
> +		goto err_interrupt;
>  	}
>  
>  	intel_debugfs_init(sdw);
>  
>  	return 0;
>  
> +err_interrupt:
> +	sdw_cdns_enable_interrupt(&sdw->cdns, false);
>  err_dai:

Isn't this unused now?

>  	free_irq(sdw->res->irq, sdw);
>  err_init:
>  	sdw_delete_bus_master(&sdw->cdns.bus);
> -err_master_reg:
>  	return ret;
>  }
>  
> @@ -1107,6 +1108,7 @@ static int intel_remove(struct platform_device *pdev)
>  
>  	if (!sdw->cdns.bus.prop.hw_disabled) {
>  		intel_debugfs_exit(sdw);
> +		sdw_cdns_enable_interrupt(&sdw->cdns, false);
>  		free_irq(sdw->res->irq, sdw);
>  		snd_soc_unregister_component(sdw->cdns.dev);
>  	}
> -- 
> 2.20.1

-- 
~Vinod