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ASoC: amd: ps: Add a module parameter to influence pdm_gain 

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>
Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20230131184653.10216-7-mario.limonciello@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Mario Limonciello 2023-01-31 12:46:52 -06:00 committed by Mark Brown
parent 99ecc7889b
commit 5579a96622
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 8 additions and 2 deletions
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2
sound/soc/amd/ps/acp63.h
View File

@ -29,7 +29,7 @@
#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

8
sound/soc/amd/ps/ps-pdm-dma.c
View File

@ -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 +60,8 @@ 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 &= ~ACP_WOV_GAIN_CONTROL;
pdm_ctrl |= FIELD_PREP(ACP_WOV_GAIN_CONTROL, clamp(pdm_gain, 0, 3));
acp63_writel(pdm_ctrl, acp_base + ACP_WOV_MISC_CTRL);
}