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SubjectRe: [PATCH V5 3/3] firmware: scm: Modify only the download bits in TCSR register
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On 7/20/2023 12:04 AM, Kathiravan T wrote:
> From: Mukesh Ojha <quic_mojha@quicinc.com>
>
> 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 <quic_poovendh@quicinc.com>
> Signed-off-by: Poovendhan Selvaraj <quic_poovendh@quicinc.com>
> Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>
> Signed-off-by: Kathiravan T <quic_kathirav@quicinc.com>
> ---
> Changes in V5:
> - Added the Signed-off-by tag for user Poovendhan
> - Dropped the macro QCOM_DOWNLOAD_MODE_SHIFT in the favor of
> PREP_FIELD
>
> drivers/firmware/qcom_scm.c | 11 +++++++++--
> 1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> index 104d86e49b97..3830dcf14326 100644
> --- a/drivers/firmware/qcom_scm.c
> +++ b/drivers/firmware/qcom_scm.c
> @@ -30,6 +30,10 @@ module_param(download_mode, bool, 0);
> #define SCM_HAS_IFACE_CLK BIT(1)
> #define SCM_HAS_BUS_CLK BIT(2)
>
> +#define QCOM_DOWNLOAD_FULLDUMP 0x1
> +#define QCOM_DOWNLOAD_NODUMP 0x0
> +#define QCOM_DOWNLOAD_MODE_MASK BIT(4)
> +

Can you update __qcom_scm_set_dload_mode to use the FIELD_PREP bits as
well? Ideally, you should be able to have no duplicate logic in
__qcom_scm_set_dload_mode and in qcom_scm_set_download_mode. Before your
patch, it was duplicated and we probably should've had it de-duplicated.
With this patch, the logic and constants used have diverged when they
don't need to.

> struct qcom_scm {
> struct device *dev;
> struct clk *core_clk;
> @@ -440,6 +444,7 @@ static int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
> static void qcom_scm_set_download_mode(bool enable)
> {
> bool avail;
> + int val;
> int ret = 0;
>
> avail = __qcom_scm_is_call_available(__scm->dev,
> @@ -448,8 +453,10 @@ 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);
> + val = enable ? QCOM_DOWNLOAD_FULLDUMP : QCOM_DOWNLOAD_NODUMP;
> + ret = qcom_scm_io_update_field(__scm->dload_mode_addr,
> + QCOM_DOWNLOAD_MODE_MASK,
> + FIELD_PREP(QCOM_DOWNLOAD_MODE_MASK, val));
> } else {
> dev_err(__scm->dev,
> "No available mechanism for setting download mode\n");

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