linux-kernel - [PATCH v4] ASoC: Intel: kbl_rt5663_rt5514_max98927: Fix kabylake_ssp

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Message-Id: <20200703121650.547944-1-lma@semihalf.com>
Date:   Fri,  3 Jul 2020 14:16:50 +0200
From:   Lukasz Majczak <lma@...ihalf.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Jie Yang <yang.jie@...ux.intel.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Harsha Priya <harshapriya.n@...el.com>
Cc:     Gopal Vamshi Krishna <vamshi.krishna.gopal@...el.com>,
        Sathya Prakash <sathya.prakash.m.r@...el.com>,
        Bob Brandt <brndt@...gle.com>,
        Alex Levin <levinale@...omium.org>,
        Ross Zwisler <zwisler@...gle.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Radoslaw Biernacki <rad@...ihalf.com>,
        linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Subject: [PATCH v4] ASoC: Intel: kbl_rt5663_rt5514_max98927: Fix kabylake_ssp_fixup function

Fix kabylake_ssp_fixup function to distinguish codecs DAIs by names,
as current approach, leads to crash while trying to get snd_soc_dpcm with
container_of() macro in kabylake_ssp_fixup().
The crash call path looks as below:
soc_pcm_hw_params()
snd_soc_dai_hw_params(codec_dai, substream, &codec_params);
rtd->dai_link->be_hw_params_fixup(rtd, params)
kabylake_ssp_fixup()
In this case, codec_params is just a copy of an internal structure and is
not embedded into struct snd_soc_dpcm thus we cannot use
container_of() on it.

v1 -> v2:
- Extract dmic from SSP0 as every BE should have own fixup function.
v2 -> v3:
- Restore naming in the dapm route table to not confuse with other
drivers
- Fixed indentations
v3 -> v4:
- Updated code and commit description according to
solution proposed by Harsha

Signed-off-by: Lukasz Majczak <lma@...ihalf.com>
Signed-off-by: Harsha Priya <harshapriya.n@...el.com>
---
 .../intel/boards/kbl_rt5663_rt5514_max98927.c | 28 ++++++++-----------
 1 file changed, 12 insertions(+), 16 deletions(-)

diff --git a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
index b34cf6cf11395..df454de40739a 100644
--- a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
+++ b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
@@ -333,36 +333,32 @@ static int kabylake_ssp_fixup(struct snd_soc_pcm_runtime *rtd,
 {
 	struct snd_interval *rate = hw_param_interval(params,
 			SNDRV_PCM_HW_PARAM_RATE);
-	struct snd_interval *chan = hw_param_interval(params,
+	struct snd_interval *channels = hw_param_interval(params,
 			SNDRV_PCM_HW_PARAM_CHANNELS);
 	struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
-	struct snd_soc_dpcm *dpcm = container_of(
-			params, struct snd_soc_dpcm, hw_params);
-	struct snd_soc_dai_link *fe_dai_link = dpcm->fe->dai_link;
-	struct snd_soc_dai_link *be_dai_link = dpcm->be->dai_link;
+	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
 
 	/*
 	 * The ADSP will convert the FE rate to 48k, stereo, 24 bit
 	 */
-	if (!strcmp(fe_dai_link->name, "Kbl Audio Port") ||
-	    !strcmp(fe_dai_link->name, "Kbl Audio Headset Playback") ||
-	    !strcmp(fe_dai_link->name, "Kbl Audio Capture Port")) {
+
+	if (!strcmp(codec_dai->name, KBL_REALTEK_DMIC_CODEC_DAI)) {
+		if (params_channels(params) == 2 ||
+			DMIC_CH(dmic_constraints) == 2)
+			channels->min = channels->max = 2;
+		else
+			channels->min = channels->max = 4;
+	} else {
 		rate->min = rate->max = 48000;
-		chan->min = chan->max = 2;
+		channels->min = channels->max = 2;
 		snd_mask_none(fmt);
 		snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S24_LE);
-	} else if (!strcmp(fe_dai_link->name, "Kbl Audio DMIC cap")) {
-		if (params_channels(params) == 2 ||
-				DMIC_CH(dmic_constraints) == 2)
-			chan->min = chan->max = 2;
-		else
-			chan->min = chan->max = 4;
 	}
 	/*
 	 * The speaker on the SSP0 supports S16_LE and not S24_LE.
 	 * thus changing the mask here
 	 */
-	if (!strcmp(be_dai_link->name, "SSP0-Codec"))
+	if (!strcmp(codec_dai->name, KBL_MAXIM_CODEC_DAI))
 		snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S16_LE);
 
 	return 0;
-- 
2.25.1