Re: [alsa-devel] [RFC PATCH 36/40] soundwire: intel: disable interrupts on suspend

Guennadi Liakhovetski
2019-07-26T15:55:26Z

On Thu, Jul 25, 2019 at 06:40:28PM -0500, Pierre-Louis Bossart wrote:
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
> ---
> drivers/soundwire/cadence_master.c | 42 +++++++++++++++++-------------
> drivers/soundwire/cadence_master.h | 2 +-
> drivers/soundwire/intel.c | 6 +++--
> 3 files changed, 29 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
> index f486fe15fb46..fa7230b0f200 100644
> --- a/drivers/soundwire/cadence_master.c
> +++ b/drivers/soundwire/cadence_master.c
> @@ -814,33 +814,39 @@ 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;
>
> - cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0,
> - CDNS_MCP_SLAVE_INTMASK0_MASK);
> - cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1,
> - CDNS_MCP_SLAVE_INTMASK1_MASK);
> + if (state) {
> + cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0,
> + CDNS_MCP_SLAVE_INTMASK0_MASK);
> + cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1,
> + CDNS_MCP_SLAVE_INTMASK1_MASK);
>
> - /* enable detection of slave state changes */
> - mask = CDNS_MCP_INT_SLAVE_RSVD | CDNS_MCP_INT_SLAVE_ALERT |
> - CDNS_MCP_INT_SLAVE_ATTACH | CDNS_MCP_INT_SLAVE_NATTACH;
> + /* enable detection of slave state changes */
> + mask = CDNS_MCP_INT_SLAVE_RSVD | CDNS_MCP_INT_SLAVE_ALERT |
> + CDNS_MCP_INT_SLAVE_ATTACH | CDNS_MCP_INT_SLAVE_NATTACH;
>
> - /* enable detection of bus issues */
> - mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
> - CDNS_MCP_INT_PARITY;
> + /* enable detection of bus issues */
> + mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
> + CDNS_MCP_INT_PARITY;
>
> - /* no detection of port interrupts for now */
> + /* no detection of port interrupts for now */
>
> - /* enable detection of RX fifo level */
> - mask |= CDNS_MCP_INT_RX_WL;
> + /* enable detection of RX fifo level */
> + mask |= CDNS_MCP_INT_RX_WL;
>
> - /* now enable all of the above */
> - mask |= CDNS_MCP_INT_IRQ;
> + /* now enable all of the above */
> + mask |= CDNS_MCP_INT_IRQ;
>
> - if (interrupt_mask) /* parameter override */
> - mask = interrupt_mask;
> + if (interrupt_mask) /* parameter override */
> + mask = interrupt_mask;
> + } else {
> + cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, 0);
> + cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, 0);
> + mask = 0;
> + }

Looks like this should be two functions? Especially since "state" is always a constant
when it is called. If there is still a lot of common code below, maybe make it a helper
function.

Thanks
Guennadi

>
> cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
>
> diff --git a/drivers/soundwire/cadence_master.h b/drivers/soundwire/cadence_master.h
> index 2b551f9226f3..1a0ba36dd78f 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);
>
> 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 9ebe38e4d979..1192d5775484 100644
> --- a/drivers/soundwire/intel.c
> +++ b/drivers/soundwire/intel.c
> @@ -1110,7 +1110,7 @@ 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);
>
> ret = sdw_cdns_exit_reset(&sdw->cdns);
>
> @@ -1169,6 +1169,8 @@ static int intel_suspend(struct device *dev)
> return 0;
> }
>
> + sdw_cdns_enable_interrupt(&sdw->cdns, false);
> +
> ret = intel_link_power_down(sdw);
> if (ret) {
> dev_err(dev, "Link power down failed: %d", ret);
> @@ -1199,7 +1201,7 @@ static int intel_resume(struct device *dev)
> return ret;
> }
>
> - sdw_cdns_enable_interrupt(&sdw->cdns);
> + sdw_cdns_enable_interrupt(&sdw->cdns, true);
>
> ret = sdw_cdns_exit_reset(&sdw->cdns);
>
> --
> 2.20.1
>
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