linux-kernel - Re: [REBASE PATCH v5 15/17] firmware: scm: Modify only the download bits in TCSR register

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Message-ID: <88a80eca-62c0-8398-323e-d1c1cd7adc8f@quicinc.com>
Date:   Tue, 12 Sep 2023 14:39:34 +0530
From:   Mukesh Ojha <quic_mojha@...cinc.com>
To:     Kathiravan Thirumoorthy <quic_kathirav@...cinc.com>,
        <corbet@....net>, <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <keescook@...omium.org>, <tony.luck@...el.com>,
        <gpiccoli@...lia.com>, <mathieu.poirier@...aro.org>,
        <catalin.marinas@....com>, <will@...nel.org>,
        <linus.walleij@...aro.org>, <andy.shevchenko@...il.com>,
        <vigneshr@...com>, <nm@...com>, <matthias.bgg@...il.com>,
        <kgene@...nel.org>, <alim.akhtar@...sung.com>,
        <bmasney@...hat.com>, <quic_tsoni@...cinc.com>
CC:     <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-hardening@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-gpio@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
        <linux-samsung-soc@...r.kernel.org>, <kernel@...cinc.com>,
        "Poovendhan Selvaraj" <quic_poovendh@...cinc.com>
Subject: Re: [REBASE PATCH v5 15/17] firmware: scm: Modify only the download
 bits in TCSR register



On 9/11/2023 8:37 PM, Kathiravan Thirumoorthy wrote:
> 
> On 9/11/2023 4:23 PM, Mukesh Ojha wrote:
>> Crashdump collection is based on the DLOAD bit of TCSR register.
>> To retain other bits, we read the register and modify only the
>> DLOAD bit as the other bits have their own significance.
>>
>> Co-developed-by: Poovendhan Selvaraj <quic_poovendh@...cinc.com>
>> Signed-off-by: Poovendhan Selvaraj <quic_poovendh@...cinc.com>
>> Signed-off-by: Mukesh Ojha <quic_mojha@...cinc.com>
>> Tested-by: Kathiravan Thirumoorthy <quic_kathirav@...cinc.com> # 
>> IPQ9574 and IPQ5332
>> ---
>>   drivers/firmware/qcom_scm.c | 16 ++++++++++++++--
>>   1 file changed, 14 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
>> index 321133f0950d..5cacae63ee2a 100644
>> --- a/drivers/firmware/qcom_scm.c
>> +++ b/drivers/firmware/qcom_scm.c
>> @@ -5,6 +5,8 @@
>>   #include <linux/platform_device.h>
>>   #include <linux/init.h>
>>   #include <linux/interrupt.h>
>> +#include <linux/bitfield.h>
>> +#include <linux/bits.h>
>>   #include <linux/completion.h>
>>   #include <linux/cpumask.h>
>>   #include <linux/export.h>
>> @@ -26,6 +28,14 @@
>>   static bool download_mode = 
>> IS_ENABLED(CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT);
>>   module_param(download_mode, bool, 0);
>> +#define SCM_HAS_CORE_CLK    BIT(0)
>> +#define SCM_HAS_IFACE_CLK    BIT(1)
>> +#define SCM_HAS_BUS_CLK        BIT(2)
> 
> 
> Is this intentional to add these macros back again?

This is a mistake, thanks for letting me know.

-Mukesh
> 
> 
>> +
>> +#define QCOM_DLOAD_MASK        GENMASK(5, 4)
>> +#define QCOM_DLOAD_FULLDUMP    0x1
>> +#define QCOM_DLOAD_NODUMP    0x0
>> +
>>   struct qcom_scm {
>>       struct device *dev;
>>       struct clk *core_clk;
>> @@ -440,6 +450,7 @@ static int __qcom_scm_set_dload_mode(struct device 
>> *dev, bool enable)
>>   static void qcom_scm_set_download_mode(bool enable)
>>   {
>> +    u32 val = enable ? QCOM_DLOAD_FULLDUMP : QCOM_DLOAD_NODUMP;
>>       bool avail;
>>       int ret = 0;
>> @@ -449,8 +460,9 @@ static void qcom_scm_set_download_mode(bool enable)
>>       if (avail) {
>>           ret = __qcom_scm_set_dload_mode(__scm->dev, enable);
>>       } else if (__scm->dload_mode_addr) {
>> -        ret = qcom_scm_io_writel(__scm->dload_mode_addr,
>> -                enable ? QCOM_SCM_BOOT_SET_DLOAD_MODE : 0);
>> +        ret = qcom_scm_io_update_field(__scm->dload_mode_addr,
>> +                           QCOM_DLOAD_MASK,
>> +                           FIELD_PREP(QCOM_DLOAD_MASK, val));
>>       } else {
>>           dev_err(__scm->dev,
>>               "No available mechanism for setting download mode\n");