[PATCH] [v2] ASoC: atmel-classd: improve Kconfig dependencies

[arnd@arndb.de (Arnd Bergmann)]

Commit 061981ff8cc8 ("ASoC: atmel: properly select dma driver state")
changed the way that the dependencies are handled, but then the
Class D amplifier support got merged, which used the old method.

This seems to have triggered a very rare randconfig condition for me
now, leading to a link error:

sound/soc/atmel/atmel_ssc_dai.o: In function `atmel_ssc_set_audio':
atmel_ssc_dai.c:(.text+0x79c): undefined reference to `atmel_pcm_dma_platform_register'
atmel_ssc_dai.c:(.text+0x79c): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `atmel_pcm_dma_platform_register'
sound/soc/atmel/atmel_ssc_dai.o: In function `atmel_ssc_put_audio':
atmel_ssc_dai.c:(.text+0xf24): undefined reference to `atmel_pcm_dma_platform_unregister'
atmel_ssc_dai.c:(.text+0xf24): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `atmel_pcm_dma_platform_unregister'

This changes the SND_ATMEL_SOC_DMA option so it gets built whenever
one of the two users (SND_ATMEL_SOC_SSC_DMA and SND_ATMEL_SOC_CLASSD)
is enabled, with the twist that we make it built-in when SND_ATMEL_SOC_SSC
is built-in, even if one of the other two is a module.

I think this captures best what the real dependency in the hardware
is, and it simplifies the logic a bit.

Fixes: e0a25b6d1862 ("ASoC: atmel-classd: add the Audio Class D Amplifier")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
v2: rewrite the change completely, after running into a new regression.

I'm putting it out on the list so we can review the change together,
but I'm still doing more testing at the same time. If I don't reply
by Dec 6, nothing new has come up.
---
 sound/soc/atmel/Kconfig | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/sound/soc/atmel/Kconfig b/sound/soc/atmel/Kconfig
index 4a56f3dfba51..af9a9096d50b 100644
--- a/sound/soc/atmel/Kconfig
+++ b/sound/soc/atmel/Kconfig
@@ -20,8 +20,8 @@ config SND_ATMEL_SOC_SSC_PDC
 config SND_ATMEL_SOC_DMA
 	tristate
 	select SND_SOC_GENERIC_DMAENGINE_PCM
-	default m if SND_ATMEL_SOC_SSC_DMA=m && SND_ATMEL_SOC_SSC=m
-	default y if SND_ATMEL_SOC_SSC_DMA=y || (SND_ATMEL_SOC_SSC_DMA=m && SND_ATMEL_SOC_SSC=y)
+	default y if SND_ATMEL_SOC_SSC=y && (SND_ATMEL_SOC_SSC_DMA=m || SND_ATMEL_SOC_CLASSD=m)
+	default SND_ATMEL_SOC_CLASSD || SND_ATMEL_SOC_SSC_DMA
 
 config SND_ATMEL_SOC_SSC_DMA
 	tristate
@@ -64,7 +64,6 @@ config SND_AT91_SOC_SAM9X5_WM8731
 config SND_ATMEL_SOC_CLASSD
 	tristate "Atmel ASoC driver for boards using CLASSD"
 	depends on ARCH_AT91 || COMPILE_TEST
-	select SND_ATMEL_SOC_DMA
 	select REGMAP_MMIO
 	help
 	  Say Y if you want to add support for Atmel ASoC driver for boards using
-- 
2.9.0