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YP-CP3: switch the headphone amplifier pin to GPIO

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The headphone amplifier enable, GPIO F2, shares its pin with SDRAM
address line A12 and is A12 until switched in IOMUXB. Rockbox never
switched it, so driving F2 never reached the amplifier: started from
the Rockbox bootloader, playback and the FM radio were near silent
and distorted. They only worked when the original firmware had run
first, as it switches the pin. The 16 MB of SDRAM does not use A12.

Tested on a YP-CP3 booted from the Rockbox bootloader.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Change-Id: I40610aaf88f06fd4831d07174b0f66a4ba32204d
This commit is contained in:
Marcin Bukat 2026-10-08 10:26:40 +02:00
parent 853274937c
commit aba3fe1d57
1 changed files with 4 additions and 1 deletions
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5
firmware/drivers/audio/wm8751.c
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@ -188,7 +188,10 @@ void audiohw_preinit(void)
or_l((1<<5), &GPIO1_ENABLE); or_l((1<<5), &GPIO1_ENABLE);
or_l((1<<5), &GPIO1_FUNCTION); or_l((1<<5), &GPIO1_FUNCTION);
#elif defined(SAMSUNG_YPCP3) #elif defined(SAMSUNG_YPCP3)
/* headphone amplifier enable, GPIO F2 active high: off for now */ /* headphone amplifier enable, GPIO F2 active high: off for now. The
* pin is SDRAM A12 until switched to GPIO, which the 16 MB of SDRAM
* does not need; the original firmware switches it. */
SCU_IOMUXB_CON |= IOMUX_GPIO_F2;
GPIO_PFDR &= ~(1<<2); GPIO_PFDR &= ~(1<<2);
GPIO_PFCON |= (1<<2); GPIO_PFCON |= (1<<2);
#endif #endif