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Message-ID: <8ba388e7-e344-068b-b233-8d96903abf6b@linux.intel.com>
Date: Mon, 21 Oct 2019 05:26:28 -0500
From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To: Vinod Koul <vkoul@...nel.org>
Cc: alsa-devel@...a-project.org, tiwai@...e.de,
gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
broonie@...nel.org, srinivas.kandagatla@...aro.org,
jank@...ence.com, slawomir.blauciak@...el.com,
Sanyog Kale <sanyog.r.kale@...el.com>,
Bard liao <yung-chuan.liao@...ux.intel.com>,
Rander Wang <rander.wang@...ux.intel.com>
Subject: Re: [alsa-devel] [PATCH v2 4/5] soundwire: intel/cadence: add flag
for interrupt enable
On 10/20/19 11:14 PM, Vinod Koul wrote:
> 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..?
Doing a goto to do a return is not very nice either.
I can change this, but it doesn't really matter: this entire code will
be removed anyways to get rid of platform_devices and the probe itself
will be split in two.
>
>> }
>>
>> 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
>
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