ARM: OMAP1: ams-delta: Fix audio permanently muted

Since commit 1137ceee76ba ("ARM: OMAP1: ams-delta: Don't request unused
GPIOs"), on-board audio has appeared muted.  Believed to be unused GPIO
pin "hookflash1", apparently set high regardless of the corresponding
bit of "latch2" port attempted to be set low during .init_machine(),
has been identified as the reason.

According to Amstrad E3 wiki, the purpose of the pin hasn't been
clearly identified.  Original Amstrad software used to produce a high
pulse on it when the phone was taken off hook or recall was pressed.
With the current finding, we can assume the pin provides a kind of
audio mute function.

Proper resolution of the issue should be done in two steps:
- resolution of an issue with the pin state not reflecting the value
  the corresponding bit of the port was attempted to be initialized
  with,
- extension of on-board audio driver with a new control.

For now, rename the pin to "audio_mute" to reflect its function and,
as a quick fix, hogg it as output low so on-board audio can produce
audible sound again.

Fixes: 1137ceee76ba ("ARM: OMAP1: ams-delta: Don't request unused GPIOs")
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap1/board-ams-delta.c b/arch/arm/mach-omap1/board-ams-delta.c
index 3d191fd..1d801f5 100644 (file)
--- a/arch/arm/mach-omap1/board-ams-delta.c
+++ b/arch/arm/mach-omap1/board-ams-delta.c
@@ -247,8 +247,8 @@ static struct platform_device latch2_gpio_device = {
 #define LATCH2_PIN_SCARD_CMDVCC                11
 #define LATCH2_PIN_MODEM_NRESET                12
 #define LATCH2_PIN_MODEM_CODEC         13
-#define LATCH2_PIN_HOOKFLASH1          14
-#define LATCH2_PIN_HOOKFLASH2          15
+#define LATCH2_PIN_AUDIO_MUTE          14
+#define LATCH2_PIN_HOOKFLASH           15
 
 static struct regulator_consumer_supply modem_nreset_consumers[] = {
        REGULATOR_SUPPLY("RESET#", "serial8250.1"),
@@ -588,6 +588,8 @@ static int gpiochip_match_by_label(struct gpio_chip *chip, void *data)
 static struct gpiod_hog ams_delta_gpio_hogs[] = {
        GPIO_HOG(LATCH2_LABEL, LATCH2_PIN_KEYBRD_DATAOUT, "keybrd_dataout",
                 GPIO_ACTIVE_HIGH, GPIOD_OUT_LOW),
+       GPIO_HOG(LATCH2_LABEL, LATCH2_PIN_AUDIO_MUTE, "audio_mute",
+                GPIO_ACTIVE_HIGH, GPIOD_OUT_LOW),
        {},
 };