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[3/3] ASoC: cs35l45: Prevents spinning during runtime suspend

Message ID 20231206160318.1255034-4-rriveram@opensource.cirrus.com
State Accepted
Commit a0ffa8115e1ea9786b03edc3f431d2f4ef3e7a2e
Headers show
Series [1/3] ASoC: cs35l45: Use modern pm_ops | expand

Commit Message

Ricardo Rivera-Matos Dec. 6, 2023, 4:03 p.m. UTC 
Masks the "DSP Virtual Mailbox 2 write" interrupt when before
issuing the hibernate command to the DSP. The interrupt is
unmasked when exiting runtime suspend as it is required for
DSP operation.

Without this change the DSP fires an interrupt when hibernating
causing the system spin between runtime suspend and runtime
resume.

Signed-off-by: Ricardo Rivera-Matos <rriveram@opensource.cirrus.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
---
 sound/soc/codecs/cs35l45.c | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/sound/soc/codecs/cs35l45.c b/sound/soc/codecs/cs35l45.c
index 28f76fccf277..44c221745c3b 100644
--- a/sound/soc/codecs/cs35l45.c
+++ b/sound/soc/codecs/cs35l45.c
@@ -947,6 +947,8 @@  static int cs35l45_enter_hibernate(struct cs35l45_private *cs35l45)
 
 	cs35l45_setup_hibernate(cs35l45);
 
+	regmap_set_bits(cs35l45->regmap, CS35L45_IRQ1_MASK_2, CS35L45_DSP_VIRT2_MBOX_MASK);
+
 	// Don't wait for ACK since bus activity would wake the device
 	regmap_write(cs35l45->regmap, CS35L45_DSP_VIRT1_MBOX_1, CSPL_MBOX_CMD_HIBERNATE);
 
@@ -967,6 +969,8 @@  static int cs35l45_exit_hibernate(struct cs35l45_private *cs35l45)
 					  CSPL_MBOX_CMD_OUT_OF_HIBERNATE);
 			if (!ret) {
 				dev_dbg(cs35l45->dev, "Wake success at cycle: %d\n", j);
+				regmap_clear_bits(cs35l45->regmap, CS35L45_IRQ1_MASK_2,
+						 CS35L45_DSP_VIRT2_MBOX_MASK);
 				return 0;
 			}
 			usleep_range(100, 200);