linux-kernel - Re: [PATCH 1/2] slimbus: stream: add stream support

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Message-ID: <152994313712.143105.4349052596355647972@swboyd.mtv.corp.google.com>
Date:   Mon, 25 Jun 2018 09:12:17 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        broonie@...nel.org, gregkh@...uxfoundation.org
Cc:     sdharia@...cinc.com, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, alsa-devel@...a-project.org,
        ctatlor97@...il.com, vkoul@...nel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: Re: [PATCH 1/2] slimbus: stream: add stream support

Quoting Srinivas Kandagatla (2018-06-21 06:40:08)
> new file mode 100644
> index 000000000000..f8af9474d286
> --- /dev/null
> +++ b/drivers/slimbus/stream.c
> @@ -0,0 +1,493 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (c) 2018, Linaro Limited
> +
> +#include <linux/kernel.h>
> +#include <linux/errno.h>
> +#include <linux/slab.h>
> +#include <linux/list.h>
> +#include <linux/slimbus.h>
> +#include "slimbus.h"
> +
> +/**
> + * struct segdist_code - Segment Distributions code from
> + *     Table 20 of SLIMbus Specs Version 2.0
> + *
> + * @ratem: Channel Rate Multipler(Segments per Superframe)
> + * @seg_interval: Number of slots between the first Slot of Segment
> + *             and the first slot of the next  consecutive Segment.
> + * @segdist_code: Segment Distribution Code SD[11:0]
> + * @seg_offset_mask: Segment offset mask in SD[11:0]
> + * @segdist_codes: List of all possible Segmet Distribution codes.
> + */
> +static struct segdist_code {

const?

> +       int ratem;
> +       int seg_interval;
> +       int segdist_code;
> +       u32 seg_offset_mask;
> +
> +} segdist_codes[] = {
> +       {1,     1536,   0x200,   0xdff},
> +       {2,     768,    0x100,   0xcff},
> +       {4,     384,    0x080,   0xc7f},
> +       {8,     192,    0x040,   0xc3f},
> +       {16,    96,     0x020,   0xc1f},
> +       {32,    48,     0x010,   0xc0f},
> +       {64,    24,     0x008,   0xc07},
> +       {128,   12,     0x004,   0xc03},
> +       {256,   6,      0x002,   0xc01},
> +       {512,   3,      0x001,   0xc00},
> +       {3,     512,    0xe00,   0x1ff},
> +       {6,     256,    0xd00,   0x0ff},
> +       {12,    128,    0xc80,   0x07f},
> +       {24,    64,     0xc40,   0x03f},
> +       {48,    32,     0xc20,   0x01f},
> +       {96,    16,     0xc10,   0x00f},
> +       {192,   8,      0xc08,   0x007},
> +       {364,   4,      0xc04,   0x003},
> +       {768,   2,      0xc02,   0x001},
> +};
> +
> +/**
> + * struct slim_presence_rate - Presense Rate table for all Natural Frequencies
> + *     The Presense rate of a constant bitrate stram is mean flow rate of the
> + *     stream expressed in occupied Segments of that Data Channel per second.
> + *     Table 66 from SLIMbus 2.0 Specs
> + *
> + * @rate: data rate
> + * @pr_code: presence rate code PR[6:0]
> + * @prate_table: All possible presence rate code for Natural Frequencies
> + */
> +static struct slim_presence_rate {

const?

> +       int rate;
> +       int pr_code;
> +} prate_table[] = {