linux-kernel - Re: [PATCH 10/33] iris: vidc: add helper functions

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Date:   Fri, 28 Jul 2023 19:41:14 +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 10/33] iris: vidc: add helper functions

On 28.07.2023 15:23, Vikash Garodia wrote:
> This implements common helper functions for v4l2 to vidc and
> vice versa conversion for different enums.
> Add helpers for state checks, buffer management, locks etc.
> 
> Signed-off-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
> Signed-off-by: Vikash Garodia <quic_vgarodia@...cinc.com>
> ---
[...]

> +
> +#define is_odd(val) ((val) % 2 == 1)
> +#define in_range(val, min, max) (((min) <= (val)) && ((val) <= (max)))
> +#define COUNT_BITS(a, out) {       \
hweight.* functions?

[...]

> +
> +const char *cap_name(enum msm_vidc_inst_capability_type cap_id)
> +{
> +	const char *name = "UNKNOWN CAP";
Perhaps it'd be worth to include the unknown cap id here

> +
> +	if (cap_id >= ARRAY_SIZE(cap_name_arr))
> +		goto exit;
> +
> +	name = cap_name_arr[cap_id];
> +
> +exit:
> +	return name;
> +}
[...]

> +
> +const char *buf_name(enum msm_vidc_buffer_type type)
> +{
> +	const char *name = "UNKNOWN BUF";
Similarly here

> +
> +	if (type >= ARRAY_SIZE(buf_type_name_arr))
> +		goto exit;
> +
> +	name = buf_type_name_arr[type];
> +
> +exit:
> +	return name;
> +}
[...]

> +const char *v4l2_type_name(u32 port)
> +{
> +	switch (port) {
switch-case seems a bit excessive here.

> +	case INPUT_MPLANE:      return "INPUT";
> +	case OUTPUT_MPLANE:     return "OUTPUT";
> +	}
> +
> +	return "UNKNOWN";
> +}
[...]

There's some more stuff I'd comment on, but 4500 lines in a single patch
is way too much to logically follow.

Couple more style suggestions:
- use Reverse-Christmas-tree sorting for variable declarations
- some oneliner functions could possibly become preprocessor macros
- when printing giant debug messages, you may want to use loops
- make sure your indentation is in order, 100 chars per line is
  totally fine
- generally inline magic hex values are discouraged, but if they're
  necessary, the hex should be lowercase

Konrad