On Wed, 4 Oct 2023 at 20:28, Mukesh Ojha <quic_mojha@xxxxxxxxxxx> wrote:
>
> 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.
Nit: please take a look at
`Documentation/process/submitting-patches.rst`: `Describe your changes
in imperative mood'.
We do not read registers. Driver does. Nevertheless, this is a minor
issue, which shouldn't prevent this patch from being applied.
>
> 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>
> ---
> 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 084e4782b88d..da3d028f6451 100644
> --- a/drivers/firmware/qcom_scm.c
> +++ b/drivers/firmware/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>
> @@ -27,6 +29,10 @@
> static bool download_mode = IS_ENABLED(CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT);
> module_param(download_mode, bool, 0);
>
> +#define QCOM_DLOAD_MASK GENMASK(5, 4)
> +#define QCOM_DLOAD_FULLDUMP 0x1
> +#define QCOM_DLOAD_NODUMP 0x0
Nit: it might be better to move these defines after all struct definitions.
> +
> struct qcom_scm {
> struct device *dev;
> struct clk *core_clk;
> @@ -518,6 +524,7 @@ 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;
>
> @@ -527,8 +534,9 @@ 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
>
--
With best wishes
Dmitry
