On Tue, Feb 21, 2023 at 08:09:40PM +0530, Mukesh Ojha wrote:
> Currently on Qualcomm SoC, download_mode is enabled if
> CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT is selected. Refactor
> the code such that it supports multiple download modes and
> drop the config.
>
> Signed-off-by: Mukesh Ojha <quic_mojha@xxxxxxxxxxx>
> ---
> drivers/firmware/Kconfig | 11 -----------
> drivers/firmware/qcom_scm.c | 45 +++++++++++++++++++++++++++++++++++++++------
> include/linux/qcom_scm.h | 4 ++++
> 3 files changed, 43 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
> index b59e304..ff7e9f3 100644
> --- a/drivers/firmware/Kconfig
> +++ b/drivers/firmware/Kconfig
> @@ -215,17 +215,6 @@ config MTK_ADSP_IPC
> config QCOM_SCM
> tristate
>
> -config QCOM_SCM_DOWNLOAD_MODE_DEFAULT
> - bool "Qualcomm download mode enabled by default"
> - depends on QCOM_SCM
> - help
> - A device with "download mode" enabled will upon an unexpected
> - warm-restart enter a special debug mode that allows the user to
> - "download" memory content over USB for offline postmortem analysis.
> - The feature can be enabled/disabled on the kernel command line.
> -
> - Say Y here to enable "download mode" by default.
> -
> config SYSFB
> bool
> select BOOT_VESA_SUPPORT
> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> index c376ba8..4975d3c 100644
> --- a/drivers/firmware/qcom_scm.c
> +++ b/drivers/firmware/qcom_scm.c
> @@ -20,8 +20,43 @@
>
> #include "qcom_scm.h"
>
> -static bool download_mode = IS_ENABLED(CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT);
> -module_param(download_mode, bool, 0);
> +static unsigned int download_mode;
> +static struct qcom_scm *__scm;
Add newline. Also, moving __scm wasn't called out in the commit
description.
> +static void qcom_scm_set_download_mode(bool enable);
> +static int set_dload_mode(const char *val, const struct kernel_param *kp)
Can set_dload_mode() be placed after qcom_scm_set_download_mode() so
that you don't need to declare it before hand.
> +{
> + int ret;
> + int old_mode = download_mode;
> +
> + ret = param_set_int(val, kp);
> + if (ret)
> + return ret;
> +
> + switch (download_mode) {
> + case QCOM_DOWNLOAD_FULLDUMP:
> + if (__scm)
> + qcom_scm_set_download_mode(true);
> + break;
> + case QCOM_DOWNLOAD_NODUMP:
> + if (__scm)
> + qcom_scm_set_download_mode(false);
> + break;
> + default:
> + pr_err("unknown download mode\n");
> + download_mode = old_mode;
> + return -EINVAL;
param_set_int() has been called already and has the invalid value. I
think the param_set_int() should be called after the download mode has
been set successfully.
> + }
> +
> + return 0;
> +}
> +
> +static const struct kernel_param_ops dload_mode_param_ops = {
> + .set = set_dload_mode,
> + .get = param_get_hexint,
> +};
> +module_param_cb(download_mode, &dload_mode_param_ops, &download_mode, 0644);
> +MODULE_PARM_DESC(download_mode,
> + "Download mode: 0x0=no dump mode (default), 0x10=full dump mode");
>
> #define SCM_HAS_CORE_CLK BIT(0)
> #define SCM_HAS_IFACE_CLK BIT(1)
> @@ -70,8 +105,6 @@ static const char * const qcom_scm_convention_names[] = {
> [SMC_CONVENTION_LEGACY] = "smc legacy",
> };
>
> -static struct qcom_scm *__scm;
> -
> static int qcom_scm_clk_enable(void)
> {
> int ret;
> @@ -435,8 +468,8 @@ static void qcom_scm_set_download_mode(bool enable)
> }
>
> 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));
> + ((dload_addr_val & ~QCOM_DOWNLOAD_MODE_MASK) | download_mode) :
> + dload_addr_val & ~QCOM_DOWNLOAD_MODE_MASK);
These two lines were introduced in an earlier patch in this series. Why
not just introduce the QCOM_DOWNLOAD_MODE_MASK there?
Brian
