linux-kernel - [PATCH v2 1/4] ALSA: hda: cs35l41: Set Channel Index correctly when system is missing

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Message-ID: <20240126164005.367021-2-sbinding@opensource.cirrus.com>
Date: Fri, 26 Jan 2024 16:40:02 +0000
From: Stefan Binding <sbinding@...nsource.cirrus.com>
To: Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
CC: <alsa-devel@...a-project.org>, <linux-sound@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <patches@...nsource.cirrus.com>,
        "Stefan
 Binding" <sbinding@...nsource.cirrus.com>
Subject: [PATCH v2 1/4] ALSA: hda: cs35l41: Set Channel Index correctly when system is missing _DSD

Current method to set Channel Index when the system is missing _DSD
assumes that the channels alternate, which is not guaranteed.
Instead use the same methodology as the main driver does when _DSD
exists.

Fixes: 8c4c216db8fb ("ALSA: hda: cs35l41: Add config table to support many laptops without _DSD")

Signed-off-by: Stefan Binding <sbinding@...nsource.cirrus.com>
---
 sound/pci/hda/cs35l41_hda_property.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/sound/pci/hda/cs35l41_hda_property.c b/sound/pci/hda/cs35l41_hda_property.c
index 35277ce890a4..87edf0d2fbb0 100644
--- a/sound/pci/hda/cs35l41_hda_property.c
+++ b/sound/pci/hda/cs35l41_hda_property.c
@@ -203,6 +203,7 @@ static int generic_dsd_config(struct cs35l41_hda *cs35l41, struct device *physde
 	struct spi_device *spi;
 	bool dsd_found;
 	int ret;
+	int i;
 
 	for (cfg = cs35l41_config_table; cfg->ssid; cfg++) {
 		if (!strcasecmp(cfg->ssid, cs35l41->acpi_subsystem_id))
@@ -288,16 +289,6 @@ static int generic_dsd_config(struct cs35l41_hda *cs35l41, struct device *physde
 			cs35l41->index = id == 0x40 ? 0 : 1;
 	}
 
-	if (cfg->num_amps == 3)
-		/* 3 amps means a center channel, so no duplicate channels */
-		cs35l41->channel_index = 0;
-	else
-		/*
-		 * if 4 amps, there are duplicate channels, so they need different indexes
-		 * if 2 amps, no duplicate channels, channel_index would be 0
-		 */
-		cs35l41->channel_index = cs35l41->index / 2;
-
 	cs35l41->reset_gpio = fwnode_gpiod_get_index(acpi_fwnode_handle(cs35l41->dacpi), "reset",
 						     cs35l41->index, GPIOD_OUT_LOW,
 						     "cs35l41-reset");
@@ -305,6 +296,11 @@ static int generic_dsd_config(struct cs35l41_hda *cs35l41, struct device *physde
 
 	hw_cfg->spk_pos = cfg->channel[cs35l41->index];
 
+	cs35l41->channel_index = 0;
+	for (i = 0; i < cs35l41->index; i++)
+		if (cfg->channel[i] == hw_cfg->spk_pos)
+			cs35l41->channel_index++;
+
 	if (cfg->boost_type == INTERNAL) {
 		hw_cfg->bst_type = CS35L41_INT_BOOST;
 		hw_cfg->bst_ind = cfg->boost_ind_nanohenry;
-- 
2.34.1