linux-kernel - Re: [PATCH 4/7] soundwire: intel: add definitions for shim

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Date:   Mon, 23 Mar 2020 17:58:26 +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>,
        Hui Wang <hui.wang@...onical.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: Re: [PATCH 4/7] soundwire: intel: add definitions for shim_mask

On 20-03-20, 09:13, Pierre-Louis Bossart wrote:
> 
> > > diff --git a/drivers/soundwire/intel.h b/drivers/soundwire/intel.h
> > > index 568c84a80d79..cfc83120b8f9 100644
> > > --- a/drivers/soundwire/intel.h
> > > +++ b/drivers/soundwire/intel.h
> > > @@ -16,6 +16,7 @@
> > >    * @ops: Shim callback ops
> > >    * @dev: device implementing hw_params and free callbacks
> > >    * @shim_lock: mutex to handle access to shared SHIM registers
> > > + * @shim_mask: global pointer to check SHIM register initialization
> > >    */
> > >   struct sdw_intel_link_res {
> > >   	struct platform_device *pdev;
> > > @@ -27,6 +28,7 @@ struct sdw_intel_link_res {
> > >   	const struct sdw_intel_ops *ops;
> > >   	struct device *dev;
> > >   	struct mutex *shim_lock; /* protect shared registers */
> > > +	u32 *shim_mask;
> > 
> > You have a pointer, okay where is it initialized
> 
> same answer as shim_lock, it's initialized at the higher level
> 
> https://github.com/thesofproject/linux/blob/9c7487b33072040ab755d32ca173b75151c0160c/drivers/soundwire/intel_init.c#L252

Why can't it be done here, what stops you?

You really need to keep initialzation and usage in same patch :(

-- 
~Vinod