linux-kernel - Re: [PATCH 14/33] iris: vidc: add helpers for state management

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Message-ID: <60271d41-7807-0808-34d0-684ab9e81a90@linaro.org>
Date:   Fri, 28 Jul 2023 19:52:52 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Vikash Garodia <quic_vgarodia@...cinc.com>,
        stanimir.k.varbanov@...il.com, agross@...nel.org,
        andersson@...nel.org, mchehab@...nel.org, hans.verkuil@...co.com,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Cc:     quic_dikshita@...cinc.com
Subject: Re: [PATCH 14/33] iris: vidc: add helpers for state management

On 28.07.2023 15:23, Vikash Garodia wrote:
> This implements the functions to handle different core
> and instance state transitions.
> 
> Signed-off-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
> Signed-off-by: Vikash Garodia <quic_vgarodia@...cinc.com>
> ---
[...]

> +enum msm_vidc_core_sub_state {
> +	CORE_SUBSTATE_NONE                   = 0x0,
> +	CORE_SUBSTATE_POWER_ENABLE           = BIT(0),
> +	CORE_SUBSTATE_GDSC_HANDOFF           = BIT(1),
> +	CORE_SUBSTATE_PM_SUSPEND             = BIT(2),
> +	CORE_SUBSTATE_FW_PWR_CTRL            = BIT(3),
> +	CORE_SUBSTATE_PAGE_FAULT             = BIT(4),
> +	CORE_SUBSTATE_CPU_WATCHDOG           = BIT(5),
> +	CORE_SUBSTATE_VIDEO_UNRESPONSIVE     = BIT(6),
> +	CORE_SUBSTATE_MAX                    = BIT(7),
Why store it in an enum if they're not consecutive? You can make them
preprocessor #defines.

> +};
> +
> +enum msm_vidc_core_event_type {
> +	CORE_EVENT_NONE                      = BIT(0),
> +	CORE_EVENT_UPDATE_SUB_STATE          = BIT(1),
> +};
Ditto (even though techinically they're consecutive)

> +
> +enum msm_vidc_state {
> +	MSM_VIDC_OPEN,
> +	MSM_VIDC_INPUT_STREAMING,
> +	MSM_VIDC_OUTPUT_STREAMING,
> +	MSM_VIDC_STREAMING,
> +	MSM_VIDC_CLOSE,
> +	MSM_VIDC_ERROR,
> +};
> +
> +#define MSM_VIDC_SUB_STATE_NONE          0
> +#define MSM_VIDC_MAX_SUB_STATES          6
> +/*
> + * max value of inst->sub_state if all
> + * the 6 valid bits are set i.e 111111==>63
> + */
> +#define MSM_VIDC_MAX_SUB_STATE_VALUE     ((1 << MSM_VIDC_MAX_SUB_STATES) - 1)
> +
> +enum msm_vidc_sub_state {
> +	MSM_VIDC_DRAIN                     = BIT(0),
> +	MSM_VIDC_DRC                       = BIT(1),
> +	MSM_VIDC_DRAIN_LAST_BUFFER         = BIT(2),
> +	MSM_VIDC_DRC_LAST_BUFFER           = BIT(3),
> +	MSM_VIDC_INPUT_PAUSE               = BIT(4),
> +	MSM_VIDC_OUTPUT_PAUSE              = BIT(5),
Ditto

[...]

> +static int msm_vidc_core_init_wait_state(struct msm_vidc_core *core,
> +					 enum msm_vidc_core_event_type type,
> +					 struct msm_vidc_event_data *data)
> +{
> +	int rc = 0;
rc seems never assigned again, good to drop

[...]

> +
> +static int msm_vidc_core_init_state(struct msm_vidc_core *core,
> +				    enum msm_vidc_core_event_type type,
> +				    struct msm_vidc_event_data *data)
> +{
> +	int rc = 0;
Ditto

[...]

> +static int msm_vidc_core_error_state(struct msm_vidc_core *core,
> +				     enum msm_vidc_core_event_type type,
> +				     struct msm_vidc_event_data *data)
> +{
> +	int rc = 0;
Ditto

[...]

> +int msm_vidc_update_core_state(struct msm_vidc_core *core,
> +			       enum msm_vidc_core_state request_state, const char *func)
> +{
> +	struct msm_vidc_core_state_handle *state_handle = NULL;
> +	int rc = 0;
Ditto

[...]

> +int msm_vidc_change_core_state(struct msm_vidc_core *core,
> +			       enum msm_vidc_core_state request_state, const char *func)
> +{
> +	enum msm_vidc_allow allow;
> +	int rc = 0;
Ditto

[...]

> +bool is_state(struct msm_vidc_inst *inst, enum msm_vidc_state state)
> +{
> +	return inst->state == state;
> +}
> +
> +bool is_sub_state(struct msm_vidc_inst *inst, enum msm_vidc_sub_state sub_state)
> +{
> +	return (inst->sub_state & sub_state);
> +}
Why are there 2 separate funcs for core and inst? Don't we have
a pointer within one to the other?


[...]

> +
> +int msm_vidc_update_state(struct msm_vidc_inst *inst,
> +			  enum msm_vidc_state request_state, const char *func)
> +{
> +	struct msm_vidc_state_handle *state_handle = NULL;
> +	int rc = 0;
rc is unused

[...]

> +static int msm_vidc_set_sub_state(struct msm_vidc_inst *inst,
> +				  enum msm_vidc_sub_state sub_state, const char *func)
> +{
> +	char sub_state_name[MAX_NAME_LENGTH];
> +	int cnt, rc = 0;
ditto

Konrad