On 1/8/2024 7:27 AM, Mukesh Ojha wrote:
> Crashdump collection is done based on DLOAD bits of TCSR register.
> To retain other bits, scm driver need to read the register and
> modify only the DLOAD bits, as other bits in TCSR may have their
> own significance.
>
> Co-developed-by: Poovendhan Selvaraj <quic_poovendh@xxxxxxxxxxx>
> Signed-off-by: Poovendhan Selvaraj <quic_poovendh@xxxxxxxxxxx>
> Signed-off-by: Mukesh Ojha <quic_mojha@xxxxxxxxxxx>
> Tested-by: Kathiravan Thirumoorthy <quic_kathirav@xxxxxxxxxxx> # IPQ9574 and IPQ5332
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Reviewed-by: Elliot Berman <quic_eberman@xxxxxxxxxxx>
> ---
> drivers/firmware/qcom/qcom_scm.c | 14 ++++++++++++--
> 1 file changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
> index 25549178a30f..4421f219fe9a 100644
> --- a/drivers/firmware/qcom/qcom_scm.c
> +++ b/drivers/firmware/qcom/qcom_scm.c
> @@ -4,6 +4,8 @@
> */
>
> #include <linux/arm-smccc.h>
> +#include <linux/bitfield.h>
> +#include <linux/bits.h>
> #include <linux/clk.h>
> #include <linux/completion.h>
> #include <linux/cpumask.h>
> @@ -117,6 +119,12 @@ static const u8 qcom_scm_cpu_warm_bits[QCOM_SCM_BOOT_MAX_CPUS] = {
> #define QCOM_SMC_WAITQ_FLAG_WAKE_ONE BIT(0)
> #define QCOM_SMC_WAITQ_FLAG_WAKE_ALL BIT(1)
>
> +#define QCOM_DLOAD_MASK GENMASK(5, 4)
> +enum qcom_dload_mode {
> + QCOM_DLOAD_NODUMP = 0,
> + QCOM_DLOAD_FULLDUMP = 1,
> +};
> +
> static const char * const qcom_scm_convention_names[] = {
> [SMC_CONVENTION_UNKNOWN] = "unknown",
> [SMC_CONVENTION_ARM_32] = "smc arm 32",
> @@ -523,6 +531,7 @@ 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;
>
> @@ -532,8 +541,9 @@ 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_rmw(__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");
