The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 5b78223f55a0f516a1639dbe11cd4324d4aaee20 Mon Sep 17 00:00:00 2001 From: Hans de Goede hdegoede@redhat.com Date: Mon, 6 Dec 2021 18:48:06 +0100 Subject: [PATCH] mfd: intel_soc_pmic: Use CPU-id check instead of _HRV check to differentiate variants

The Intel Crystal Cove PMIC has 2 different variants, one for use with Bay Trail (BYT) SoCs and one for use with Cherry Trail (CHT) SoCs.

So far we have been using an ACPI _HRV check to differentiate between the 2, but at least on the Microsoft Surface 3, which is a CHT device, the wrong _HRV value is reported by ACPI.

So instead switch to a CPU-ID check which prevents us from relying on the possibly wrong ACPI _HRV value.

Signed-off-by: Hans de Goede hdegoede@redhat.com Reported-by: Tsuchiya Yuto kitakar@gmail.com Reviewed-by: Andy Shevchenko andy.shevchenko@gmail.com Signed-off-by: Lee Jones lee.jones@linaro.org Link: https://lore.kernel.org/r/20211206174806.197772-2-hdegoede@redhat.com

diff --git a/drivers/mfd/intel_soc_pmic_core.c b/drivers/mfd/intel_soc_pmic_core.c index ddd64f9e3341..47cb7f00dfcf 100644 --- a/drivers/mfd/intel_soc_pmic_core.c +++ b/drivers/mfd/intel_soc_pmic_core.c @@ -14,15 +14,12 @@ #include <linux/module.h> #include <linux/mfd/core.h> #include <linux/mfd/intel_soc_pmic.h> +#include <linux/platform_data/x86/soc.h> #include <linux/pwm.h> #include <linux/regmap.h>

#include "intel_soc_pmic_core.h"

-/* Crystal Cove PMIC shares same ACPI ID between different platforms */ -#define BYT_CRC_HRV 2 -#define CHT_CRC_HRV 3 - /* PWM consumed by the Intel GFX */ static struct pwm_lookup crc_pwm_lookup[] = { PWM_LOOKUP("crystal_cove_pwm", 0, "0000:00:02.0", "pwm_pmic_backlight", 0, PWM_POLARITY_NORMAL), @@ -34,31 +31,12 @@ static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c, struct device *dev = &i2c->dev; struct intel_soc_pmic_config *config; struct intel_soc_pmic *pmic; - unsigned long long hrv; - acpi_status status; int ret;

- /* - * There are 2 different Crystal Cove PMICs a Bay Trail and Cherry - * Trail version, use _HRV to differentiate between the 2. - */ - status = acpi_evaluate_integer(ACPI_HANDLE(dev), "_HRV", NULL, &hrv); - if (ACPI_FAILURE(status)) { - dev_err(dev, "Failed to get PMIC hardware revision\n"); - return -ENODEV; - } - - switch (hrv) { - case BYT_CRC_HRV: + if (soc_intel_is_byt()) config = &intel_soc_pmic_config_byt_crc; - break; - case CHT_CRC_HRV: + else config = &intel_soc_pmic_config_cht_crc; - break; - default: - dev_warn(dev, "Unknown hardware rev %llu, assuming BYT\n", hrv); - config = &intel_soc_pmic_config_byt_crc; - }

pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL); if (!pmic)