linux-kernel - [PATCH 2/2] soundwire: qcom: handle command ignored interrupt

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Message-Id: <20230728112848.67092-2-krzysztof.kozlowski@linaro.org>
Date:   Fri, 28 Jul 2023 13:28:48 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        linux-arm-msm@...r.kernel.org, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 2/2] soundwire: qcom: handle command ignored interrupt

Qualcomm Soundwire v2.0.0 controller comes with new interrupt bit for
ignored commands.  Add code to handle it in the interrupt service
routine.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 drivers/soundwire/qcom.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index 3ae3e5896308..3061db6adac7 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -61,6 +61,7 @@
 #define SWRM_INTERRUPT_STATUS_BUS_RESET_FINISHED_V2		BIT(13)
 #define SWRM_INTERRUPT_STATUS_CLK_STOP_FINISHED_V2		BIT(14)
 #define SWRM_INTERRUPT_STATUS_EXT_CLK_STOP_WAKEUP		BIT(16)
+#define SWRM_INTERRUPT_STATUS_CMD_IGNORED_AND_EXEC_CONTINUED	BIT(19)
 #define SWRM_INTERRUPT_MAX					17
 #define SWRM_V1_3_INTERRUPT_MASK_ADDR				0x204
 #define SWRM_V1_3_INTERRUPT_CLEAR				0x208
@@ -792,6 +793,17 @@ static irqreturn_t qcom_swrm_irq_handler(int irq, void *dev_id)
 				break;
 			case SWRM_INTERRUPT_STATUS_EXT_CLK_STOP_WAKEUP:
 				break;
+			case SWRM_INTERRUPT_STATUS_CMD_IGNORED_AND_EXEC_CONTINUED:
+				ctrl->reg_read(ctrl,
+					       ctrl->reg_layout[SWRM_REG_CMD_FIFO_STATUS],
+					       &value);
+				dev_err(ctrl->dev,
+					"%s: SWR CMD ignored, fifo status %x\n",
+					__func__, value);
+
+				/* Wait 3.5ms to clear */
+				usleep_range(3500, 3505);
+				break;
 			default:
 				dev_err_ratelimited(ctrl->dev,
 						"%s: SWR unknown interrupt value: %d\n",
-- 
2.34.1