linux-kernel - Re: [PATCH 32/33] iris: variant: iris3: implement logic to compute clock frequency

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Date:   Fri, 28 Jul 2023 20:13:51 +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 32/33] iris: variant: iris3: implement logic to compute
 clock frequency

On 28.07.2023 15:23, Vikash Garodia wrote:
> From: Dikshita Agarwal <quic_dikshita@...cinc.com>
> 
> This implements the logic to computer the required clock frequency
> by encoder or decoder for a specific usecase. It considers the input
> as various parameters configured by client for that usecase.
> 
> Signed-off-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
> Signed-off-by: Vikash Garodia <quic_vgarodia@...cinc.com>
> ---
>  .../iris/variant/iris3/src/msm_vidc_clock_iris3.c  | 627 +++++++++++++++++++++
>  1 file changed, 627 insertions(+)
>  create mode 100644 drivers/media/platform/qcom/iris/variant/iris3/src/msm_vidc_clock_iris3.c
> 
> diff --git a/drivers/media/platform/qcom/iris/variant/iris3/src/msm_vidc_clock_iris3.c b/drivers/media/platform/qcom/iris/variant/iris3/src/msm_vidc_clock_iris3.c
> new file mode 100644
> index 0000000..6665aef
> --- /dev/null
> +++ b/drivers/media/platform/qcom/iris/variant/iris3/src/msm_vidc_clock_iris3.c
> @@ -0,0 +1,627 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#include "msm_vidc_debug.h"
> +
> +#define ENABLE_FINEBITRATE_SUBUHD60 0
> +#include "perf_static_model.h"
> +
> +/*
> + * Chipset Generation Technology: SW/FW overhead profiling
> + * need update with new numbers
> + */
> +static u32 frequency_table_iris3[2][6] = {
I think it's the third repetition of the same (ftbl + OPP)

> +	/* //make lowsvs_D1 as invalid; */
> +	{533, 444, 366, 338, 240, 0},
> +	{800, 666, 549, 507, 360, 0},
> +};
> +
> + /* Tensilica cycles */
> +#define DECODER_VPP_FW_OVERHEAD_IRIS3                                                  66234
> +
> +/* Tensilica cycles; this is measured in Lahaina 1stage with FW profiling */
Is it gonna differ for other SoCs? Especially that 8350 has IRIS2?

> +#define DECODER_VPPVSP1STAGE_FW_OVERHEAD_IRIS3                                         93000
> +
> +#define DECODER_VSP_FW_OVERHEAD_IRIS3 \
> +	(DECODER_VPPVSP1STAGE_FW_OVERHEAD_IRIS3 - DECODER_VPP_FW_OVERHEAD_IRIS3)
> +
> +/* Tensilica cycles; encoder has ARP register */
> +#define ENCODER_VPP_FW_OVERHEAD_IRIS3                                                  48405
> +
> +#define ENCODER_VPPVSP1STAGE_FW_OVERHEAD_IRIS3 \
> +	(ENCODER_VPP_FW_OVERHEAD_IRIS3 + DECODER_VSP_FW_OVERHEAD_IRIS3)
> +
> +#define DECODER_SW_OVERHEAD_IRIS3                                                      489583
> +#define ENCODER_SW_OVERHEAD_IRIS3                                                      489583
> +
> +/* Video IP Core Technology: pipefloor and pipe penlaty */
> +static u32 decoder_vpp_target_clk_per_mb_iris3 = 200;
Why is this a variable?

[...]

> +
> +/* 8KUHD60; UHD240; 1080p960  with B */
> +static u32 fp_pixel_count_bar0 = 3840 * 2160 * 240;
> +/* 8KUHD60; UHD240; 1080p960  without B */
> +static u32 fp_pixel_count_bar1 = 3840 * 2160 * 240;
Not sure what the 'B' is, but the entries are the same. And looks like
there's:

- no need for it to be a variable
- maybe you could make this a macro or just a simple multiplication

[...]

> +u32 get_bitrate_entry(u32 pixle_count)
pixle -> pixel, checkpatch should point out typos

[...]

> +static int calculate_vsp_min_freq(struct api_calculation_input codec_input,
> +				  struct api_calculation_freq_output *codec_output)
> +{
> +	/*
> +	 * VSP calculation
> +	 * different methodology from Lahaina
> +	 */
Not sure if that comment is useful to the reader.

[...]


> +
> +static u32 calculate_pipe_penalty(struct api_calculation_input codec_input)
> +{
> +	u32 pipe_penalty_codec = 0;
> +
> +	/* decoder */
> +	if (codec_input.decoder_or_encoder == CODEC_DECODER)
> +		pipe_penalty_codec = pipe_penalty_iris3[0][0];
> +	else
> +		pipe_penalty_codec = 101;
Add a define for this magic number?

Also, return the value instead of assigning it and doing the same


Konrad