linux-kernel - [PATCH 5/5] soundwire: qcom: set clk stop need reset flag at runtime

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Date:   Thu,  9 Feb 2023 13:13:36 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     vkoul@...nel.org
Cc:     yung-chuan.liao@...ux.intel.com,
        pierre-louis.bossart@...ux.intel.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, steev@...i.org,
        johan+linaro@...nel.org, quic_bjorande@...cinc.com,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 5/5] soundwire: qcom: set clk stop need reset flag at runtime

WSA Soundwire controller needs an full reset if clock stop support
is not available in slave devices. WSA881x does not support clock stop
however WSA883x supports clock stop.

Make setting this flag at runtime to address above issue.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/soundwire/qcom.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index 74e38c0d651b..0224a5a866de 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -536,10 +536,14 @@ static int qcom_swrm_enumerate(struct sdw_bus *bus)
 
 		sdw_extract_slave_id(bus, addr, &id);
 		found = false;
+		ctrl->clock_stop_not_supported = false;
 		/* Now compare with entries */
 		list_for_each_entry_safe(slave, _s, &bus->slaves, node) {
 			if (sdw_compare_devid(slave, id) == 0) {
 				qcom_swrm_set_slave_dev_num(bus, slave, i);
+				if (!slave->prop.simple_clk_stop_capable)
+					ctrl->clock_stop_not_supported = true;
+
 				found = true;
 				break;
 			}
@@ -1500,15 +1504,6 @@ static int qcom_swrm_probe(struct platform_device *pdev)
 		 (ctrl->version >> 24) & 0xff, (ctrl->version >> 16) & 0xff,
 		 ctrl->version & 0xffff);
 
-	/* Clk stop is not supported on WSA Soundwire masters */
-	if (ctrl->version <= 0x01030000) {
-		ctrl->clock_stop_not_supported = true;
-	} else {
-		ctrl->reg_read(ctrl, SWRM_COMP_MASTER_ID, &val);
-		if (val == MASTER_ID_WSA)
-			ctrl->clock_stop_not_supported = true;
-	}
-
 #ifdef CONFIG_DEBUG_FS
 	ctrl->debugfs = debugfs_create_dir("qualcomm-sdw", ctrl->bus.debugfs);
 	debugfs_create_file("qualcomm-registers", 0400, ctrl->debugfs, ctrl,
-- 
2.21.0