linux-kernel - [PATCH v2 3/4] firmware: qcom: scm: Rework dload mode availability check

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Message-ID: <1711034642-22860-3-git-send-email-quic_mojha@quicinc.com>
Date: Thu, 21 Mar 2024 20:54:01 +0530
From: Mukesh Ojha <quic_mojha@...cinc.com>
To: <andersson@...nel.org>, <konrad.dybcio@...aro.org>
CC: <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Mukesh
 Ojha" <quic_mojha@...cinc.com>
Subject: [PATCH v2 3/4] firmware: qcom: scm: Rework dload mode availability check

QCOM_SCM_BOOT_SET_DLOAD_MODE scm command is applicable for very
older SoCs where this command is supported from firmware and
for newer SoCs, dload mode tcsr registers is used for setting
the download mode.

Currently, qcom_scm_set_download_mode() checks for availability
of QCOM_SCM_BOOT_SET_DLOAD_MODE command even for SoCs where this
is not used. Fix this by switching the condition to keep the
command availability check only if dload mode registers are not
available.

Signed-off-by: Mukesh Ojha <quic_mojha@...cinc.com>
Reviewed-by: Elliot Berman <quic_eberman@...cinc.com>
---
Changes in v2: https://lore.kernel.org/lkml/20240227155308.18395-5-quic_mojha@quicinc.com/
 - Reworded the commit text.

 drivers/firmware/qcom/qcom_scm.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
index d9153204cba3..e238ebe21099 100644
--- a/drivers/firmware/qcom/qcom_scm.c
+++ b/drivers/firmware/qcom/qcom_scm.c
@@ -495,17 +495,14 @@ static int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
 
 static void qcom_scm_set_download_mode(bool enable)
 {
-	bool avail;
 	int ret = 0;
 
-	avail = __qcom_scm_is_call_available(__scm->dev,
-					     QCOM_SCM_SVC_BOOT,
-					     QCOM_SCM_BOOT_SET_DLOAD_MODE);
-	if (avail) {
-		ret = __qcom_scm_set_dload_mode(__scm->dev, enable);
-	} else if (__scm->dload_mode_addr) {
+	if (__scm->dload_mode_addr) {
 		ret = qcom_scm_io_writel(__scm->dload_mode_addr,
-				enable ? QCOM_SCM_BOOT_SET_DLOAD_MODE : 0);
+					 enable ? QCOM_SCM_BOOT_SET_DLOAD_MODE : 0);
+	} else if (__qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_BOOT,
+						QCOM_SCM_BOOT_SET_DLOAD_MODE)) {
+		ret = __qcom_scm_set_dload_mode(__scm->dev, enable);
 	} else {
 		dev_err(__scm->dev,
 			"No available mechanism for setting download mode\n");
-- 
2.7.4