linux-kernel - Re: [PATCH v13 5/8] drivers: memory: add DMC driver for Exynos5422

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Message-ID: <20190904183510.GC12918@kozik-lap>
Date:   Wed, 4 Sep 2019 20:35:10 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Lukasz Luba <l.luba@...tner.samsung.com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, mturquette@...libre.com,
        sboyd@...nel.org, b.zolnierkie@...sung.com, kgene@...nel.org,
        mark.rutland@....com, robh+dt@...nel.org, cw00.choi@...sung.com,
        kyungmin.park@...sung.com, m.szyprowski@...sung.com,
        s.nawrocki@...sung.com, myungjoo.ham@...sung.com,
        keescook@...omium.org, tony@...mide.com, jroedel@...e.de,
        treding@...dia.com, digetx@...il.com, gregkh@...uxfoundation.org,
        willy.mh.wolff.ml@...il.com
Subject: Re: [PATCH v13 5/8] drivers: memory: add DMC driver for Exynos5422

On Wed, Aug 21, 2019 at 12:43:00PM +0200, Lukasz Luba wrote:
> This patch adds driver for Exynos5422 Dynamic Memory Controller.
> The driver provides support for dynamic frequency and voltage scaling
> for DMC and DRAM. It supports changing timings of DRAM running with
> different frequency. There is also an algorithm to calculate timigns
> based on memory description provided in DT.
> The patch also contains needed MAINTAINERS file update.
> 
> Signed-off-by: Lukasz Luba <l.luba@...tner.samsung.com>
> ---
>  MAINTAINERS                             |    8 +
>  drivers/memory/samsung/Kconfig          |   13 +
>  drivers/memory/samsung/Makefile         |    1 +
>  drivers/memory/samsung/exynos5422-dmc.c | 1257 +++++++++++++++++++++++
>  4 files changed, 1279 insertions(+)
>  create mode 100644 drivers/memory/samsung/exynos5422-dmc.c

Thanks, applied... or almost. Let's fix it incrementally.

You have two smatch warnings:
  CHECK   ../drivers/memory/samsung/exynos5422-dmc.c
drivers/memory/samsung/exynos5422-dmc.c:272 exynos5_init_freq_table() warn: passing devm_ allocated variable to kfree. 'dmc->opp'
  CHECK   ../drivers/memory/jedec_ddr_data.c
drivers/memory/samsung/exynos5422-dmc.c:565 exynos5_dmc_get_volt_freq() warn: passing zero to 'PTR_ERR'

The second looks like false positive, but first seems to be real.

You have also sparse warning to fix:
../drivers/memory/samsung/exynos5422-dmc.c:736:1: warning: symbol 'exynos5_dmc_align_init_freq' was not declared. Should it be static?

Best regards,
Krzysztof