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Message-ID: <20241104105228.97053-3-sashal@kernel.org>
Date: Mon, 4 Nov 2024 05:51:55 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Cc: Hans de Goede <hdegoede@...hat.com>,
Mark Brown <broonie@...nel.org>,
Sasha Levin <sashal@...nel.org>,
cezary.rojewski@...el.com,
liam.r.girdwood@...ux.intel.com,
peter.ujfalusi@...ux.intel.com,
yung-chuan.liao@...ux.intel.com,
ranjani.sridharan@...ux.intel.com,
kai.vehmanen@...ux.intel.com,
perex@...ex.cz,
tiwai@...e.com,
pierre-louis.bossart@...ux.dev,
alban.boye@...tonmail.com,
u.kleine-koenig@...libre.com,
tomlohave@...il.com,
linux-sound@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 03/14] ASoC: Intel: bytcr_rt5640: Add support for non ACPI instantiated codec
From: Hans de Goede <hdegoede@...hat.com>
[ Upstream commit d48696b915527b5bcdd207a299aec03fb037eb17 ]
On some x86 Bay Trail tablets which shipped with Android as factory OS,
the DSDT is so broken that the codec needs to be manually instantatiated
by the special x86-android-tablets.ko "fixup" driver for cases like this.
This means that the codec-dev cannot be retrieved through its ACPI fwnode,
add support to the bytcr_rt5640 machine driver for such manually
instantiated rt5640 i2c_clients.
An example of a tablet which needs this is the Vexia EDU ATLA 10 tablet,
which has been distributed to schools in the Spanish AndalucĂa region.
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Link: https://patch.msgid.link/20241024211615.79518-1-hdegoede@redhat.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
sound/soc/intel/boards/bytcr_rt5640.c | 33 ++++++++++++++++++++++++---
1 file changed, 30 insertions(+), 3 deletions(-)
diff --git a/sound/soc/intel/boards/bytcr_rt5640.c b/sound/soc/intel/boards/bytcr_rt5640.c
index 5b8b21ade9cfe..79c50498144ec 100644
--- a/sound/soc/intel/boards/bytcr_rt5640.c
+++ b/sound/soc/intel/boards/bytcr_rt5640.c
@@ -17,6 +17,7 @@
#include <linux/acpi.h>
#include <linux/clk.h>
#include <linux/device.h>
+#include <linux/device/bus.h>
#include <linux/dmi.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/machine.h>
@@ -32,6 +33,8 @@
#include "../atom/sst-atom-controls.h"
#include "../common/soc-intel-quirks.h"
+#define BYT_RT5640_FALLBACK_CODEC_DEV_NAME "i2c-rt5640"
+
enum {
BYT_RT5640_DMIC1_MAP,
BYT_RT5640_DMIC2_MAP,
@@ -1697,9 +1700,33 @@ static int snd_byt_rt5640_mc_probe(struct platform_device *pdev)
codec_dev = acpi_get_first_physical_node(adev);
acpi_dev_put(adev);
- if (!codec_dev)
- return -EPROBE_DEFER;
- priv->codec_dev = get_device(codec_dev);
+
+ if (codec_dev) {
+ priv->codec_dev = get_device(codec_dev);
+ } else {
+ /*
+ * Special case for Android tablets where the codec i2c_client
+ * has been manually instantiated by x86_android_tablets.ko due
+ * to a broken DSDT.
+ */
+ codec_dev = bus_find_device_by_name(&i2c_bus_type, NULL,
+ BYT_RT5640_FALLBACK_CODEC_DEV_NAME);
+ if (!codec_dev)
+ return -EPROBE_DEFER;
+
+ if (!i2c_verify_client(codec_dev)) {
+ dev_err(dev, "Error '%s' is not an i2c_client\n",
+ BYT_RT5640_FALLBACK_CODEC_DEV_NAME);
+ put_device(codec_dev);
+ }
+
+ /* fixup codec name */
+ strscpy(byt_rt5640_codec_name, BYT_RT5640_FALLBACK_CODEC_DEV_NAME,
+ sizeof(byt_rt5640_codec_name));
+
+ /* bus_find_device() returns a reference no need to get() */
+ priv->codec_dev = codec_dev;
+ }
/*
* swap SSP0 if bytcr is detected
--
2.43.0
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