linux-kernel - [PATCH v3 5/5] firmware: qcom_scm: Add multiple download mode support

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Message-ID: <1679070482-8391-6-git-send-email-quic_mojha@quicinc.com>
Date:   Fri, 17 Mar 2023 21:58:02 +0530
From:   Mukesh Ojha <quic_mojha@...cinc.com>
To:     <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <linus.walleij@...aro.org>
CC:     <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-gpio@...r.kernel.org>, Mukesh Ojha <quic_mojha@...cinc.com>
Subject: [PATCH v3 5/5] firmware: qcom_scm: Add multiple download mode support

Currently, scm driver only supports full dump when download
mode is selected. Add support to enable minidump as well both
dump(full dump + minidump).

Signed-off-by: Mukesh Ojha <quic_mojha@...cinc.com>
---
 drivers/firmware/qcom_scm.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index 69f864d..ba3eefc 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -32,6 +32,9 @@ static u32 download_mode;
 
 #define QCOM_DOWNLOAD_MODE_MASK 0x30
 #define QCOM_DOWNLOAD_FULLDUMP	0x10
+#define QCOM_DOWNLOAD_MINIDUMP  0x20
+#define QCOM_DOWNLOAD_BOTHDUMP	(QCOM_DOWNLOAD_FULLDUMP | QCOM_DOWNLOAD_MINIDUMP)
+
 #define QCOM_DOWNLOAD_NODUMP	0x0
 
 struct qcom_scm {
@@ -1421,15 +1424,19 @@ static irqreturn_t qcom_scm_irq_handler(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
-
 static int get_download_mode(char *buffer, const struct kernel_param *kp)
 {
-	int len;
+	int len = 0;
 
-	if (download_mode == QCOM_DOWNLOAD_FULLDUMP)
+	if (download_mode == QCOM_DOWNLOAD_FULLDUMP) {
 		len = sysfs_emit(buffer, "full\n");
-	else if (download_mode == QCOM_DOWNLOAD_NODUMP)
+	} else if (download_mode == QCOM_DOWNLOAD_MINIDUMP) {
+		len = sysfs_emit(buffer, "mini\n");
+	} else if (download_mode == QCOM_DOWNLOAD_BOTHDUMP) {
+		len = sysfs_emit(buffer, "both\n");
+	} else if (download_mode == QCOM_DOWNLOAD_NODUMP) {
 		len = sysfs_emit(buffer, "off\n");
+	}
 
 	return len;
 }
@@ -1438,6 +1445,10 @@ static int set_download_mode(const char *val, const struct kernel_param *kp)
 {
 	if (!strncmp(val, "full", strlen("full"))) {
 		download_mode = QCOM_DOWNLOAD_FULLDUMP;
+	} else if (!strncmp(val, "mini", strlen("mini"))) {
+		download_mode = QCOM_DOWNLOAD_MINIDUMP;
+	} else if (!strncmp(val, "both", strlen("both"))) {
+		download_mode = QCOM_DOWNLOAD_BOTHDUMP;
 	} else if (!strncmp(val, "off", strlen("off"))) {
 		download_mode = QCOM_DOWNLOAD_NODUMP;
 	} else if (kstrtouint(val, 0, &download_mode) ||
@@ -1459,7 +1470,7 @@ static const struct kernel_param_ops download_mode_param_ops = {
 
 module_param_cb(download_mode, &download_mode_param_ops, NULL, 0644);
 MODULE_PARM_DESC(download_mode,
-		 "Download mode: off/full or 0/1 for existing users");
+		 "download mode: off/full/mini/both(full+mini) or 0/1 for existing users");
 
 static int qcom_scm_probe(struct platform_device *pdev)
 {
-- 
2.7.4