Skip to content

acp_7_x: clear DMA IO stutter and PWA defaults to fix I2S loopback noise #11176

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
kv2019i merged 1 commit into from
Sep 8, 2026
+13 −0
Merged

acp_7_x: clear DMA IO stutter and PWA defaults to fix I2S loopback noise #11176

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
3 changes: 3 additions & 0 deletions src/platform/amd/acp_7_x/include/platform/platform_misc.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,9 @@
#define ACP_SRBM_CLIENT_RDDATA 0x1241BF4
#define ACP_SRBM_CYCLE_STS 0x1241BF8
#define ACP_SRBM_CLIENT_CONFIG 0x1241BFC
#define ACP_DMA_CH_LINKED_LIST_EN 0x124012C
#define ACP_DMA_IO_STUT_TIMER_LIMIT 0x1240130
#define ACP_DMA_CH_PWA_CTRL 0x1240138

/* Registers from SYSTEMPLL2P0_N3_BUS_CSR_SNAP_6 block ACP_7X */
#define ACP_7X_SYSTEMPLL2P0_N3_BUS_CSR_SNAP_6_REFCLK_BRDS 0x6D204
Expand Down
10 changes: 10 additions & 0 deletions src/platform/amd/acp_7_x/platform.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -150,6 +150,16 @@ int platform_init(struct sof *sof)
/*CONFIG_SYSTICK_PERIOD hardcoded as 200000*/
sa_init(sof, 200000);
clock_set_freq(CLK_CPU(cpu_get_id()), CLK_MAX_CPU_HZ);

/*
* Clear DMA linked-list IO stutter and PWA defaults before
* channel setup. ACP_DMA_CH_LINKED_LIST_EN DMAChIOStutEn
* (bits 24:15) defaults to all 1s.
*/
io_reg_write(PU_REGISTER_BASE + ACP_DMA_CH_LINKED_LIST_EN, 0);
io_reg_write(PU_REGISTER_BASE + ACP_DMA_IO_STUT_TIMER_LIMIT, 0);
io_reg_write(PU_REGISTER_BASE + ACP_DMA_CH_PWA_CTRL, 0);

/* init DMA */
ret = dmac_init(sof);
if (ret < 0) {
Expand Down
Loading