[PATCH v5 15/17] firmware: scm: Modify only the download bits in TCSR register
From: Mukesh Ojha <hidden>
Date: 2023-09-09 20:42:08
Also in:
linux-arm-kernel, linux-arm-msm, linux-gpio, linux-hardening, linux-mediatek, linux-remoteproc, linux-samsung-soc, lkml
Subsystem:
arm/qualcomm mailing list, the rest · Maintainer:
Linus Torvalds
Crashdump collection is based on the DLOAD bit of TCSR register. To retain other bits, we read the register and modify only the DLOAD bit as the other bits have their own significance. Co-developed-by: Poovendhan Selvaraj <redacted> Signed-off-by: Mukesh Ojha <redacted> --- drivers/firmware/qcom_scm.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index 5ea8fc4fd4e8..eda92f713019 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c@@ -5,6 +5,8 @@ #include <linux/platform_device.h> #include <linux/init.h> #include <linux/interrupt.h> +#include <linux/bitfield.h> +#include <linux/bits.h> #include <linux/completion.h> #include <linux/cpumask.h> #include <linux/export.h>
@@ -30,6 +32,10 @@ module_param(download_mode, bool, 0); #define SCM_HAS_IFACE_CLK BIT(1) #define SCM_HAS_BUS_CLK BIT(2) +#define QCOM_DLOAD_MASK GENMASK(5, 4) +#define QCOM_DLOAD_FULLDUMP 0x1 +#define QCOM_DLOAD_NODUMP 0x0 + struct qcom_scm { struct device *dev; struct clk *core_clk;
@@ -444,6 +450,7 @@ static int __qcom_scm_set_dload_mode(struct device *dev, bool enable) static void qcom_scm_set_download_mode(bool enable) { + u32 val = enable ? QCOM_DLOAD_FULLDUMP : QCOM_DLOAD_NODUMP; bool avail; int ret = 0;
@@ -453,8 +460,9 @@ static void qcom_scm_set_download_mode(bool enable) if (avail) { ret = __qcom_scm_set_dload_mode(__scm->dev, enable); } else if (__scm->dload_mode_addr) { - ret = qcom_scm_io_writel(__scm->dload_mode_addr, - enable ? QCOM_SCM_BOOT_SET_DLOAD_MODE : 0); + ret = qcom_scm_io_update_field(__scm->dload_mode_addr, + QCOM_DLOAD_MASK, + FIELD_PREP(QCOM_DLOAD_MASK, val)); } else { dev_err(__scm->dev, "No available mechanism for setting download mode\n");
--
2.7.4