linux-kernel - Re: [PATCH v4 0/4] StarFive's SDIO/eMMC driver support

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Message-ID: <34512ec5-d110-2817-cd25-fa4bb75989ce@starfivetech.com>
Date:   Tue, 28 Feb 2023 13:56:57 +0800
From:   William Qiu <william.qiu@...rfivetech.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
CC:     <linux-riscv@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-mmc@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 0/4] StarFive's SDIO/eMMC driver support



On 2023/2/27 22:53, Ulf Hansson wrote:
> On Mon, 27 Feb 2023 at 08:47, William Qiu <william.qiu@...rfivetech.com> wrote:
>>
>>
>>
>> On 2023/2/15 20:37, Ulf Hansson wrote:
>> > On Wed, 15 Feb 2023 at 12:32, William Qiu <william.qiu@...rfivetech.com> wrote:
>> >>
>> >> Hi,
>> >>
>> >> This patchset adds initial rudimentary support for the StarFive
>> >> designware mobile storage host controller driver. And this driver will
>> >> be used in StarFive's VisionFive 2 board. The main purpose of adding
>> >> this driver is to accommodate the ultra-high speed mode of eMMC.
>> >>
>> >> The last patch should be applied after the patchset [1]:
>> >> [1] https://lore.kernel.org/all/20221220011247.35560-1-hal.feng@starfivetech.com/
>> >>
>> >> Changes v3->v4:
>> >> - Added documentation to describe StarFive System Controller Registers.
>> >> - Added aon_syscon and stg_syscon node.
>> >> - Fixed some checkpatch errors/warnings.
>> >>
>> >> Changes v2->v3:
>> >> - Wraped commit message according to Linux coding style.
>> >> - Rephrased the description of the patches.
>> >> - Changed the description of syscon regsiter.
>> >> - Dropped redundant properties.
>> >>
>> >> Changes v1->v2:
>> >> - Renamed the dt-binding 'starfive,jh7110-sdio.yaml' to 'starfive,jh7110-mmc.yaml'.
>> >> - Changed the type of 'starfive,syscon' and modify its description.
>> >> - Deleted unused head files like '#include <linux/gpio.h>'.
>> >> - Added comment for the 'rise_point' and 'fall_point'.
>> >> - Changed the API 'num_caps' to 'common_caps'.
>> >> - Changed the node name 'sys_syscon' to 'syscon'.
>> >> - Changed the node name 'sdio' to 'mmc'.
>> >>
>> >> The patch series is based on v6.1.
>> >>
>> >> William Qiu (4):
>> >>   dt-bindings: mmc: Add StarFive MMC module
>> >>   mmc: starfive: Add sdio/emmc driver support
>> >>   riscv: dts: starfive: Add mmc node
>> >>   dt-bindings: syscon: Add StarFive syscon doc
>> >>
>> >>  .../bindings/mmc/starfive,jh7110-mmc.yaml     |  77 ++++++++
>> >>  .../bindings/soc/starfive/jh7110-syscon.yaml  |  51 +++++
>> >>  MAINTAINERS                                   |  11 ++
>> >>  .../jh7110-starfive-visionfive-2.dtsi         |  23 +++
>> >>  arch/riscv/boot/dts/starfive/jh7110.dtsi      |  47 +++++
>> >>  drivers/mmc/host/Kconfig                      |  10 +
>> >>  drivers/mmc/host/Makefile                     |   1 +
>> >>  drivers/mmc/host/dw_mmc-starfive.c            | 186 ++++++++++++++++++
>> >>  8 files changed, 406 insertions(+)
>> >>  create mode 100644 Documentation/devicetree/bindings/mmc/starfive,jh7110-mmc.yaml
>> >>  create mode 100644 Documentation/devicetree/bindings/soc/starfive/jh7110-syscon.yaml
>> >>  create mode 100644 drivers/mmc/host/dw_mmc-starfive.c
>> >>
>> >
>> > I have dropped the v3 patches and applied patch1 and patch2 from the
>> > v4 series instead, for my next branch, thanks!
>> >
>> > Kind regards
>> > Uffe
>>
>> Hi Uffe,
>>
>> Sorry to bother you.But I found a bug that in drivers/mmc/host/dw_mmc-starfive.c:
>>
>>     47 static int dw_mci_starfive_execute_tuning(struct dw_mci_slot *slot,
>>     48                                              u32 opcode)
>>     49 {
>>     50         static const int grade  = MAX_DELAY_CHAIN;
>>     51         struct dw_mci *host = slot->host;
>>     52         struct starfive_priv *priv = host->priv;
>>     53         int rise_point = -1, fall_point = -1;
>>     54         int err, prev_err;
>>     55         int i;
>>     56         bool found = 0;
>>     57         u32 regval;
>>     58
>>     59         /*
>>     60          * Use grade as the max delay chain, and use the rise_point and
>>     61          * fall_point to ensure the best sampling point of a data input
>>     62          * signals.
>>     63          */
>>     64         for (i = 0; i < grade; i++) {
>>     65                 regval = i << priv->syscon_shift;
>>     66                 err = regmap_update_bits(priv->reg_syscon, priv->syscon_offset,
>>     67                                                 priv->syscon_mask, regval);
>>     68                 if (err)
>>     69                         return err;
>>     70                 mci_writel(host, RINTSTS, ALL_INT_CLR);
>>     71
>>     72                 err = mmc_send_tuning(slot->mmc, opcode, NULL);
>>     73                 if (!err)
>>     74                         found = 1;
>>     75
>>     76                 if (i > 0) {
>> --> 77                         if (err && !prev_err)
>>
>> prev_err was never initialized to zero.
>>
>> So I'm here to ask for your suggestion, should I send a new version
>> to fix it or send you a patch with a fixes tag?
> 
> Please send a new incremental patch on top. I will queue it up as a
> fix for v6.3-rc[n].
> 
> Kind regards
> Uffe

Fine, I'll do it in my next version. Thanks for your apply.

Best regards
William