linux-kernel - Re: [PATCH v12 3/9] firmware: qcom: scm: Modify only the download bits in TCSR register

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Date: Tue, 5 Mar 2024 16:13:12 +0530
From: Mukesh Ojha <quic_mojha@...cinc.com>
To: Bjorn Andersson <andersson@...nel.org>
CC: <konrad.dybcio@...aro.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linus.walleij@...aro.org>,
        <linux-gpio@...r.kernel.org>,
        Poovendhan Selvaraj
	<quic_poovendh@...cinc.com>,
        Kathiravan Thirumoorthy
	<quic_kathirav@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Elliot Berman <quic_eberman@...cinc.com>
Subject: Re: [PATCH v12 3/9] firmware: qcom: scm: Modify only the download
 bits in TCSR register



On 3/3/2024 12:43 AM, Bjorn Andersson wrote:
> On Tue, Feb 27, 2024 at 09:23:02PM +0530, Mukesh Ojha wrote:
>> Crashdump collection is done based on DLOAD bits of TCSR register.
>> To retain other bits, scm driver need to read the register and
>> modify only the DLOAD bits, as other bits in TCSR may 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
>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>> Reviewed-by: Elliot Berman <quic_eberman@...cinc.com>
>> ---
>>   drivers/firmware/qcom/qcom_scm.c | 14 ++++++++++++--
>>   1 file changed, 12 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
>> index 8f766fce5f7c..bd6bfdf2d828 100644
>> --- a/drivers/firmware/qcom/qcom_scm.c
>> +++ b/drivers/firmware/qcom/qcom_scm.c
>> @@ -4,6 +4,8 @@
>>    */
>>   
>>   #include <linux/arm-smccc.h>
>> +#include <linux/bitfield.h>
>> +#include <linux/bits.h>
>>   #include <linux/clk.h>
>>   #include <linux/completion.h>
>>   #include <linux/cpumask.h>
>> @@ -114,6 +116,12 @@ static const u8 qcom_scm_cpu_warm_bits[QCOM_SCM_BOOT_MAX_CPUS] = {
>>   #define QCOM_SMC_WAITQ_FLAG_WAKE_ONE	BIT(0)
>>   #define QCOM_SMC_WAITQ_FLAG_WAKE_ALL	BIT(1)
>>   
>> +#define QCOM_DLOAD_MASK		GENMASK(5, 4)
>> +enum qcom_dload_mode {
>> +	QCOM_DLOAD_NODUMP	= 0,
>> +	QCOM_DLOAD_FULLDUMP	= 1,
> 
> These values are not enumerations, they represent fixed/defined values
> in the interface. As such it's appropriate to use #define.
> 

Thanks for giving reasoning on why it should be #define and not enum.

-Mukesh