lkml.org 
[lkml]   [2023]   [Feb]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH V5 5/5] firmware: scm: Modify only the DLOAD bit in TCSR register for download mode
From


On 2/16/2023 5:30 PM, Poovendhan Selvaraj 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.
>
> Co-developed-by: Anusha Rao <quic_anusha@quicinc.com>
> Signed-off-by: Anusha Rao <quic_anusha@quicinc.com>
> Co-developed-by: Kathiravan Thirumoorthy <quic_kathirav@quicinc.com>
> Signed-off-by: Kathiravan Thirumoorthy <quic_kathirav@quicinc.com>
> Signed-off-by: Poovendhan Selvaraj <quic_poovendh@quicinc.com>
> ---
> Changes in V5:
> - checking the return value in qcom_scm_set_download_mode function as
> suggested by Srinivas Kandagatla
>
> Changes in V4:
> - retain the orginal value of tcsr register when download mode
> is not set
>
> 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 468d4d5ab550..d88c5f14bd54 100644
> --- a/drivers/firmware/qcom_scm.c
> +++ b/drivers/firmware/qcom_scm.c
> @@ -407,7 +407,7 @@ int qcom_scm_set_remote_state(u32 state, u32 id)
> }
> EXPORT_SYMBOL(qcom_scm_set_remote_state);
>
> -static int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
> +static int __qcom_scm_set_dload_mode(struct device *dev, u32 val, bool enable)
> {
> struct qcom_scm_desc desc = {
> .svc = QCOM_SCM_SVC_BOOT,
> @@ -417,7 +417,8 @@ static int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
> .owner = ARM_SMCCC_OWNER_SIP,
> };
>
> - desc.args[1] = enable ? QCOM_SCM_BOOT_SET_DLOAD_MODE : 0;
> + desc.args[1] = enable ? val | QCOM_SCM_BOOT_SET_DLOAD_MODE :
> + val & ~(QCOM_SCM_BOOT_SET_DLOAD_MODE);
>
> return qcom_scm_call_atomic(__scm->dev, &desc, NULL);
> }
> @@ -426,15 +427,25 @@ static void qcom_scm_set_download_mode(bool enable)
> {
> bool avail;
> int ret = 0;
> + u32 dload_addr_val;
>
> avail = __qcom_scm_is_call_available(__scm->dev,
> QCOM_SCM_SVC_BOOT,
> QCOM_SCM_BOOT_SET_DLOAD_MODE);
> + ret = qcom_scm_io_readl(__scm->dload_mode_addr, &dload_addr_val);
> +
> + if (ret) {
> + dev_err(__scm->dev,
> + "failed to read dload mode address value: %d\n", ret);
> + return;
> + }
> +
> if (avail) {
> - ret = __qcom_scm_set_dload_mode(__scm->dev, enable);
> + ret = __qcom_scm_set_dload_mode(__scm->dev, dload_addr_val, enable);

Did you test this on a target where it comes under this if statement?
does it really need to know dload_mode_addr for this target ?

-Mukesh
> } 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_writel(__scm->dload_mode_addr, enable ?
> + dload_addr_val | QCOM_SCM_BOOT_SET_DLOAD_MODE :
> + dload_addr_val & ~(QCOM_SCM_BOOT_SET_DLOAD_MODE));
> } else {
> dev_err(__scm->dev,
> "No available mechanism for setting download mode\n");

\
 
 \ /
  Last update: 2023-03-27 00:25    [W:0.101 / U:0.124 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site