linux-kernel - [PATCH 1/2] soundwire: qcom: use newer link status tregister on v2.0.0

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Date:   Fri, 28 Jul 2023 13:28:47 +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 1/2] soundwire: qcom: use newer link status tregister on v2.0.0

Soundwire v2.0.0 comes with a new register LINK_STATUS for the
FRAME_GEN_ENABLED field (bit indicating that an active frame is
running).  The old register COMP_STATUS is still there and still works,
although the new one is preferred in downstream sources.  Probably
because it allows to choose Soundwire instance per CPU.  Most of the
code allowing to use new register for Soundwire v2.0.0 was already there
as part of commit 312355a6a9f6 ("soundwire: qcom: add support for v2.0.0
controller"), so switch to it in swrm_wait_for_frame_gen_enabled()
function.  This should not have functional impact, because the old
register still behaves correctly.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 drivers/soundwire/qcom.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index f8fd2eb4a2bb..3ae3e5896308 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -817,8 +817,8 @@ static bool swrm_wait_for_frame_gen_enabled(struct qcom_swrm_ctrl *ctrl)
 	int comp_sts;

 	do {
-		ctrl->reg_read(ctrl, SWRM_COMP_STATUS, &comp_sts);
-
+		ctrl->reg_read(ctrl, ctrl->reg_layout[SWRM_REG_FRAME_GEN_ENABLED],
+			       &comp_sts);
 		if (comp_sts & SWRM_FRM_GEN_ENABLED)
 			return true;

-- 
2.34.1