Re: [REBASE PATCH v5 15/17] firmware: scm: Modify only the download bits in TCSR register

[Kathiravan Thirumoorthy <quic_kathirav@quicinc.com>]

On 9/11/2023 4:23 PM, Mukesh Ojha 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: Poovendhan Selvaraj <quic_poovendh@quicinc.com>
> Signed-off-by: Poovendhan Selvaraj <quic_poovendh@quicinc.com>
> Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>
> Tested-by: Kathiravan Thirumoorthy <quic_kathirav@quicinc.com> # IPQ9574 and IPQ5332
> ---
>   drivers/firmware/qcom_scm.c | 16 ++++++++++++++--
>   1 file changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> index 321133f0950d..5cacae63ee2a 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>
> @@ -26,6 +28,14 @@
>   static bool download_mode = IS_ENABLED(CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT);
>   module_param(download_mode, bool, 0);
>   
> +#define SCM_HAS_CORE_CLK	BIT(0)
> +#define SCM_HAS_IFACE_CLK	BIT(1)
> +#define SCM_HAS_BUS_CLK		BIT(2)


Is this intentional to add these macros back again?


> +
> +#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;
> @@ -440,6 +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;
>   
> @@ -449,8 +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");