[PATCH 1/1] ALSA: hda: cs35l41: Dell Fiorano add missing _DSD properties

[Aleksandrs Vinarskis]

Dell XPS 9530 (2023) has two SPI connected CS35L41 amplifiers, however
is missing _DSD properties, cs-gpios and has a firmware bug which caps SPI
controller's speed to unusable 3051Hz. This patch adds _DSD properties and
sets second cs-gpio. In case SPI speed bug is detected, it will not
initialize the device to avoid hangs on wake up.

Resolution of SPI speed bug requires either a patch to `intel-lpss.c` or an
UEFI update with corrected values from Dell. Tested with locally applied
patch to `intel-lpss` on multiple XPS 9530 devices.

Co-developed-by: Jasper Smet <josbeir@xxxxxxxxx>
Signed-off-by: Jasper Smet <josbeir@xxxxxxxxx>
Signed-off-by: Aleksandrs Vinarskis <alex.vinarskis@xxxxxxxxx>
---
 sound/pci/hda/cs35l41_hda_property.c | 47 ++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/sound/pci/hda/cs35l41_hda_property.c b/sound/pci/hda/cs35l41_hda_property.c
index c83328971728..69446a794397 100644
--- a/sound/pci/hda/cs35l41_hda_property.c
+++ b/sound/pci/hda/cs35l41_hda_property.c
@@ -7,9 +7,55 @@
 // Author: Stefan Binding <sbinding@xxxxxxxxxxxxxxxxxxxxx>
 
 #include <linux/gpio/consumer.h>
+#include <linux/spi/spi.h>
 #include <linux/string.h>
 #include "cs35l41_hda_property.h"
 
+/*
+ * Device 10280BEB (Dell XPS 9530) doesn't have _DSD at all. Moreover, pin that is typically
+ * used for `speaker_id` is missing. SPI's cs-gpios definitions are also missing.
+ */
+static int dell_fiorano_no_acpi(struct cs35l41_hda *cs35l41, struct device *physdev, int id,
+				const char *hid)
+{
+	struct cs35l41_hw_cfg *hw_cfg = &cs35l41->hw_cfg;
+	struct spi_device *spi = to_spi_device(cs35l41->dev);
+
+	/*
+	 * 10280BEB has a firmware bug, which wrongly enables clock divider for intel-lpss
+	 * Resultant SPI clock is 100Mhz/32767=3051Hz, which leads to ~3 minute hang on boot/wake up
+	 * Avoid initializing device if lpss was not patched/fixed UEFI was not installed
+	 */
+	if (spi->max_speed_hz < CS35L41_SPI_MAX_FREQ) {
+		dev_err(cs35l41->dev, "SPI's max_speed_hz is capped at %u Hz, will not continue to avoid hanging\n",
+			spi->max_speed_hz);
+		return -EINVAL;
+	}
+
+	dev_info(cs35l41->dev, "Adding DSD properties for %s\n", cs35l41->acpi_subsystem_id);
+
+	/* check SPI address to assign the index */
+	cs35l41->index = id;
+	cs35l41->channel_index = 0;
+	/* 10280BEB is missing pin which is typically assigned to `spk-id-gpios` */
+	cs35l41->speaker_id = cs35l41_get_speaker_id(physdev, cs35l41->index, 2, -1);
+	cs35l41->reset_gpio = gpiod_get_index(physdev, NULL, 1, GPIOD_OUT_LOW);
+
+	hw_cfg->spk_pos = cs35l41->index  ? 1 : 0;	// 0th L, 1st R
+	hw_cfg->bst_type = CS35L41_EXT_BOOST;
+	hw_cfg->gpio1.func = CS35l41_VSPK_SWITCH;
+	hw_cfg->gpio1.valid = true;
+	hw_cfg->gpio2.func = CS35L41_INTERRUPT;
+	hw_cfg->gpio2.valid = true;
+	hw_cfg->valid = true;
+
+	/* Add second cs-gpio here */
+	if (cs35l41->index)
+		spi->cs_gpiod = gpiod_get_index(physdev, NULL, 0, GPIOD_OUT_HIGH);
+
+	return 0;
+}
+
 /*
  * Device CLSA010(0/1) doesn't have _DSD so a gpiod_get by the label reset won't work.
  * And devices created by serial-multi-instantiate don't have their device struct
@@ -92,6 +138,7 @@ static const struct cs35l41_prop_model cs35l41_prop_model_table[] = {
 	{ "CLSA0100", NULL, lenovo_legion_no_acpi },
 	{ "CLSA0101", NULL, lenovo_legion_no_acpi },
 	{ "CSC3551", "103C89C6", hp_vision_acpi_fix },
+	{ "CSC3551", "10280BEB", dell_fiorano_no_acpi },
 	{}
 };
 
-- 
2.40.1