Re: [PATCH v7 2/2] ASoC: codecs: add wsa881x amplifier support

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Thanks Mark for taking time to review this patch.

On 09/10/2019 17:35, Mark Brown wrote:
On Wed, Oct 09, 2019 at 09:51:08AM +0100, Srinivas Kandagatla wrote:

+static const u8 wsa881x_reg_readable[WSA881X_CACHE_SIZE] = {

+static bool wsa881x_readable_register(struct device *dev, unsigned int reg)
+{
+	return wsa881x_reg_readable[reg];
u
There's no bounds check and that array size is not...

I converted this now to a proper switch statement as other drivers do.

+static struct regmap_config wsa881x_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 8,
+	.cache_type = REGCACHE_RBTREE,
+	.reg_defaults = wsa881x_defaults,
+	.num_reg_defaults = ARRAY_SIZE(wsa881x_defaults),
+	.max_register = WSA881X_MAX_REGISTER,

...what regmap has as max_register.  Uusually you'd render as a
switch statement (as you did for volatile) and let the compiler
figure out a sensible way to do the lookup.

Sorry, I did not get your point here.

Are you saying that we can skip max_register in this regmap config ?
Then how would max_register in regmap be set?


+static void wsa881x_init(struct wsa881x_priv *wsa881x)
+{
+	struct regmap *rm = wsa881x->regmap;
+	unsigned int val = 0;
+
+	regmap_read(rm, WSA881X_CHIP_ID1, &wsa881x->version);
+	regcache_cache_only(rm, true);
+	regmap_multi_reg_write(rm, wsa881x_rev_2_0,
+			       ARRAY_SIZE(wsa881x_rev_2_0));
+	regcache_cache_only(rm, false);

This looks broken, what is it supposed to be doing?  It looks
like it should be a register patch but it's not documented.

Yep, it makes sense to move this to patch, its done in new version.

+static const struct snd_kcontrol_new wsa881x_snd_controls[] = {
+	SOC_ENUM("Smart Boost Level", smart_boost_lvl_enum),
+	WSA881X_PA_GAIN_TLV("PA Gain", WSA881X_SPKR_DRV_GAIN,
+			    4, 0xC, 1, pa_gain),

As covered in control-names.rst all volume controls should end in
Volume.

Fixed this in next version.

+static void wsa881x_clk_ctrl(struct snd_soc_component *comp, bool enable)
+{
+	struct wsa881x_priv *wsa881x = snd_soc_component_get_drvdata(comp);
+
+	mutex_lock(&wsa881x->res_lock);

What is this lock supposed to be protecting?  As far as I can
tell this function is the only place it is used and this function
has exactly one caller which itself has only one caller which is
a DAPM widget and hence needs no locking.  It looks awfully like
it should just be a widget itself, or inlined into the single
caller.

This was done for temperature sensor reads which can happen in parallel.
But for now I will remove it and add back once we add tsens support.

+static void wsa881x_bandgap_ctrl(struct snd_soc_component *comp, bool enable)
+{
+	struct wsa881x_priv *wsa881x = snd_soc_component_get_drvdata(comp);

Similarly here.

This one was over done! its now removed in next version.

+static int32_t wsa881x_resource_acquire(struct snd_soc_component *comp,
+					bool enable)
+{
+	wsa881x_clk_ctrl(comp, enable);
+	wsa881x_bandgap_ctrl(comp, enable);
+
+	return 0;
+}

There's no corresponding disables.

both wsa881x_clk_ctrl() and wsa881x_bandgap_ctrl() have corresponding disables in that functions.

thanks,
srini

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