In case of regressions for any users that the new pdm_gain value is too high and for additional debugging, introduce a module parameter that would let them configure it.
This parameter should be removed in the future: * If it's determined that the parameter is not needed, just hardcode the correct value as before * If users do end up using it to debug and report different values we should introduce a config knob that can have policy set by ucm.
Signed-off-by: Mario Limonciello mario.limonciello@amd.com --- v1->v2: * Add a guard for values > 3 to overflow the FIELD_PREP * Clear ACP_WOV_GAIN_CONTROL before setting it --- sound/soc/amd/ps/acp63.h | 2 +- sound/soc/amd/ps/ps-pdm-dma.c | 10 +++++++++- 2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/sound/soc/amd/ps/acp63.h b/sound/soc/amd/ps/acp63.h index bae8288d8231c..bed4d51e226a5 100644 --- a/sound/soc/amd/ps/acp63.h +++ b/sound/soc/amd/ps/acp63.h @@ -30,7 +30,7 @@ #define ACP_ERROR_STAT 29 #define PDM_DECIMATION_FACTOR 2 #define ACP_PDM_CLK_FREQ_MASK 7 -#define ACP_WOV_MISC_CTRL_MASK 0x18 +#define ACP_WOV_GAIN_CONTROL GENMASK(4, 3) #define ACP_PDM_ENABLE 1 #define ACP_PDM_DISABLE 0 #define ACP_PDM_DMA_EN_STATUS 2 diff --git a/sound/soc/amd/ps/ps-pdm-dma.c b/sound/soc/amd/ps/ps-pdm-dma.c index eea71a9d2ef1a..c85cd471e739e 100644 --- a/sound/soc/amd/ps/ps-pdm-dma.c +++ b/sound/soc/amd/ps/ps-pdm-dma.c @@ -7,6 +7,7 @@
#include <linux/platform_device.h> #include <linux/module.h> +#include <linux/bitfield.h> #include <linux/err.h> #include <linux/io.h> #include <sound/pcm_params.h> @@ -18,6 +19,10 @@
#define DRV_NAME "acp_ps_pdm_dma"
+static int pdm_gain = 3; +module_param(pdm_gain, int, 0644); +MODULE_PARM_DESC(pdm_gain, "Gain control (0-3)"); + static const struct snd_pcm_hardware acp63_pdm_hardware_capture = { .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | @@ -55,7 +60,10 @@ static void acp63_enable_pdm_clock(void __iomem *acp_base)
acp63_writel(pdm_clk_enable, acp_base + ACP_WOV_CLK_CTRL); pdm_ctrl = acp63_readl(acp_base + ACP_WOV_MISC_CTRL); - pdm_ctrl |= ACP_WOV_MISC_CTRL_MASK; + pdm_ctrl &= FIELD_PREP(ACP_WOV_GAIN_CONTROL, 0); + if (pdm_gain > 3) + pdm_gain = 3; + pdm_ctrl |= FIELD_PREP(ACP_WOV_GAIN_CONTROL, pdm_gain); acp63_writel(pdm_ctrl, acp_base + ACP_WOV_MISC_CTRL); }