ASoC: Intel: sst: only use sst-firmware when DW DMAC is available

Currentlly, we use Synopsys DesignWare DMA Controller for
baytrail/haswell/broadwell ADSP firmware loading, but for
skylake, we don't use it, compiling sst-firmware.c may
introduce error when CONFIG_DW_DMAC_CORE is not enabled:

    sound/built-in.o: In function `sst_dma_new':
    (.text+0xd7b38): undefined reference to `dw_dma_probe'
    sound/built-in.o: In function `sst_dma_free':
    (.text+0xd7c0a): undefined reference to `dw_dma_remove'

Here we only compile sst-firmware when CONFIG_DW_DMAC_CORE
is selected, to fix the linking error issue.

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/sound/soc/intel/common/sst-dsp.h b/sound/soc/intel/common/sst-dsp.h
index 1f45f18715c0..859f0de00339 100644
--- a/sound/soc/intel/common/sst-dsp.h
+++ b/sound/soc/intel/common/sst-dsp.h
@@ -216,10 +216,12 @@ struct sst_pdata {
 	void *dsp;
 };
 
+#if IS_ENABLED(CONFIG_DW_DMAC_CORE)
 /* Initialization */
 struct sst_dsp *sst_dsp_new(struct device *dev,
 	struct sst_dsp_device *sst_dev, struct sst_pdata *pdata);
 void sst_dsp_free(struct sst_dsp *sst);
+#endif
 
 /* SHIM Read / Write */
 void sst_dsp_shim_write(struct sst_dsp *sst, u32 offset, u32 value);