mfd: cs42l43: Prepare support for updated bios patch

Newer bios patch firmware versions now require use of the shadow register
interface, which was previously only required by the full firmware, update
the check accordingly.

Signed-off-by: Maciej Strozek <mstrozek@opensource.cirrus.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20241205115822.2371719-1-ckeepax@opensource.cirrus.com
Signed-off-by: Lee Jones <lee@kernel.org>

diff --git a/drivers/mfd/cs42l43.c b/drivers/mfd/cs42l43.c
index e5f17fc430e4879b52bf4758af3313ee66614692..11a1b7f1e121dfd57eb19d0731a2feb45fb38782 100644 (file)
--- a/drivers/mfd/cs42l43.c
+++ b/drivers/mfd/cs42l43.c
@@ -48,6 +48,7 @@
 
 #define CS42L43_MCU_SUPPORTED_REV              0x2105
 #define CS42L43_MCU_SHADOW_REGS_REQUIRED_REV   0x2200
+#define CS42L43_BIOS_SHADOW_REGS_REQUIRED_REV  0x1002
 #define CS42L43_MCU_SUPPORTED_BIOS_REV         0x0001
 
 #define CS42L43_VDDP_DELAY_US                  50
@@ -773,7 +774,8 @@ static int cs42l43_mcu_update_step(struct cs42l43 *cs42l43)
         * Later versions of the firmwware require the driver to access some
         * features through a set of shadow registers.
         */
-       shadow = mcu_rev >= CS42L43_MCU_SHADOW_REGS_REQUIRED_REV;
+       shadow = (mcu_rev >= CS42L43_MCU_SHADOW_REGS_REQUIRED_REV) ||
+                (bios_rev >= CS42L43_BIOS_SHADOW_REGS_REQUIRED_REV);
 
        ret = regmap_read(cs42l43->regmap, CS42L43_BOOT_CONTROL, &secure_cfg);
        if (ret) {