1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 config SND_EP93XX_SOC 2 config SND_EP93XX_SOC
3 tristate "SoC Audio support for the Ci 3 tristate "SoC Audio support for the Cirrus Logic EP93xx series"
4 depends on ARCH_EP93XX || COMPILE_TEST 4 depends on ARCH_EP93XX || COMPILE_TEST
5 select SND_SOC_GENERIC_DMAENGINE_PCM 5 select SND_SOC_GENERIC_DMAENGINE_PCM
6 help 6 help
7 Say Y or M if you want to add suppor 7 Say Y or M if you want to add support for codecs attached to
8 the EP93xx I2S or AC97 interfaces. 8 the EP93xx I2S or AC97 interfaces.
9 9
10 config SND_EP93XX_SOC_I2S 10 config SND_EP93XX_SOC_I2S
11 tristate "I2S controller support for t 11 tristate "I2S controller support for the Cirrus Logic EP93xx series"
12 depends on SND_EP93XX_SOC 12 depends on SND_EP93XX_SOC
13 help 13 help
14 Say Y or M if you want to add suppor 14 Say Y or M if you want to add support for codecs attached to
15 the EP93xx I2S interface. 15 the EP93xx I2S interface.
16 16
17 if SND_EP93XX_SOC_I2S 17 if SND_EP93XX_SOC_I2S
18 18
19 config SND_EP93XX_SOC_I2S_WATCHDOG 19 config SND_EP93XX_SOC_I2S_WATCHDOG
20 bool "IRQ based underflow watchdog wor 20 bool "IRQ based underflow watchdog workaround"
21 default y 21 default y
22 help 22 help
23 I2S controller on EP93xx seems to ha 23 I2S controller on EP93xx seems to have undocumented HW issue.
24 Underflow of internal I2S controller 24 Underflow of internal I2S controller FIFO could confuse the
25 state machine and the whole stream c 25 state machine and the whole stream can be shifted by one byte
26 until I2S is disabled. This option e 26 until I2S is disabled. This option enables IRQ based watchdog
27 which disables and re-enables I2S in 27 which disables and re-enables I2S in case of underflow and
28 fills FIFO with zeroes. 28 fills FIFO with zeroes.
29 29
30 If you are unsure how to answer this 30 If you are unsure how to answer this question, answer Y.
31 31
32 endif # if SND_EP93XX_SOC_I2S 32 endif # if SND_EP93XX_SOC_I2S
33 33
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.