linux-kernel - Re: [PATCH V5 1/3] firmware: qcom_scm: provide a read-modify-write function

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Message-ID: <20230729003440.GB25463@quicinc.com>
Date:   Fri, 28 Jul 2023 17:34:40 -0700
From:   Guru Das Srinagesh <quic_gurus@...cinc.com>
To:     Kathiravan T <quic_kathirav@...cinc.com>
CC:     Trilok Soni <quic_tsoni@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        "Elliot Berman" <quic_eberman@...cinc.com>,
        Mukesh Ojha <quic_mojha@...cinc.com>,
        Kalle Valo <kvalo@...nel.org>,
        Loic Poulain <loic.poulain@...aro.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-gpio@...r.kernel.org>, <quic_srichara@...cinc.com>,
        <quic_sjaganat@...cinc.com>, <quic_anusha@...cinc.com>,
        <quic_saahtoma@...cinc.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: Re: [PATCH V5 1/3] firmware: qcom_scm: provide a read-modify-write
 function

On Jul 23 2023 19:25, Kathiravan T wrote:
> 
> On 7/22/2023 6:47 AM, Trilok Soni wrote:
> >On 7/20/2023 12:04 AM, Kathiravan T wrote:
> >>From: Mukesh Ojha <quic_mojha@...cinc.com>
> >>
> >>It was realized by Srinivas K. that there is a need of read-modify-write
> >>scm exported function so that it can be used by multiple clients.
> >>
> >>Let's introduce qcom_scm_io_update_field() which masks out the bits and
> >>write the passed value to that bit-offset.
> >>
> >>Suggested-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> >>Signed-off-by: Mukesh Ojha <quic_mojha@...cinc.com>
> >>Signed-off-by: Kathiravan T <quic_kathirav@...cinc.com>
> >>---
> >>Changes in V5:
> >>    - No changes
> >>
> >>  drivers/firmware/qcom_scm.c            | 15 +++++++++++++++
> >>  include/linux/firmware/qcom/qcom_scm.h |  2 ++
> >>  2 files changed, 17 insertions(+)
> >>
> >>diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> >>index fde33acd46b7..104d86e49b97 100644
> >>--- a/drivers/firmware/qcom_scm.c
> >>+++ b/drivers/firmware/qcom_scm.c
> >>@@ -407,6 +407,21 @@ int qcom_scm_set_remote_state(u32 state, u32 id)
> >>  }
> >>  EXPORT_SYMBOL(qcom_scm_set_remote_state);
> >>  +int qcom_scm_io_update_field(phys_addr_t addr, unsigned int mask,
> >>unsigned int val)
> >>+{
> >>+    unsigned int old, new;
> >>+    int ret;
> >>+
> >>+    ret = qcom_scm_io_readl(addr, &old);
> >>+    if (ret)
> >>+        return ret;
> >>+
> >>+    new = (old & ~mask) | (val & mask);
> >>+
> >>+    return qcom_scm_io_writel(addr, new);
> >>+}
> >>+EXPORT_SYMBOL(qcom_scm_io_update_field);
> >
> >EXPORT_SYMBO_GPL please.
> 
> 
> Sure, is it okay if I send the patch to convert the existing EXPORT_SYMBOL
> to EXPORT_SYMBOL_GPL as well?

This is done already [1].

[1] https://lore.kernel.org/lkml/19d9ac0bf79f957574ef9b3b73246ea0113cc0fd.1690503893.git.quic_gurus@quicinc.com/