From: "Zulkifli, Muhammad Husaini" <muhammad.husaini.zulkifli@intel.com>
To: Michal Simek <michal.simek@xilinx.com>
Cc: "Hunter, Adrian" <adrian.hunter@intel.com>,
"ulf.hansson@linaro.org" <ulf.hansson@linaro.org>,
"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Raja Subramanian,
Lakshmi Bai" <lakshmi.bai.raja.subramanian@intel.com>,
"arnd@arndb.de" <arnd@arndb.de>,
"Wan Mohamad,
Wan Ahmad Zainie" <wan.ahmad.zainie.wan.mohamad@intel.com>,
Sudeep Holla <sudeep.holla@arm.com>
Subject: RE: [PATCH v2 2/3] firmware: Keem Bay: Add support for Arm Trusted Firmware Service call
Date: Tue, 6 Oct 2020 01:14:16 +0000 [thread overview]
Message-ID: <BYAPR11MB3015E2B23C0CBC2EBB26C29FB80D0@BYAPR11MB3015.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20201005200744.robd42nkt6ahg52x@bogus>
Hi Michal,
>-----Original Message-----
>From: Sudeep Holla <sudeep.holla@arm.com>
>Sent: Tuesday, October 6, 2020 4:08 AM
>To: Zulkifli, Muhammad Husaini <muhammad.husaini.zulkifli@intel.com>
>Cc: Michal Simek <michal.simek@xilinx.com>; Hunter, Adrian
><adrian.hunter@intel.com>; ulf.hansson@linaro.org; linux-
>mmc@vger.kernel.org; linux-arm-kernel@lists.infradead.org; linux-
>kernel@vger.kernel.org; Raja Subramanian, Lakshmi Bai
><lakshmi.bai.raja.subramanian@intel.com>; arnd@arndb.de; Wan Mohamad,
>Wan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@intel.com>
>Subject: Re: [PATCH v2 2/3] firmware: Keem Bay: Add support for Arm Trusted
>Firmware Service call
>
>On Mon, Oct 05, 2020 at 05:04:10PM +0000, Zulkifli, Muhammad Husaini wrote:
>
>> To be clarify keembay_sd_voltage_selection function as Michal's
>> prefers is actually using the firmware driver. This function located
>> in firmware driver.
>
>OK, it can be just one function place it in any file you think is more appropriate
>need not be arasan controller driver. Any reasons why this can't work ? Can even
>be in some header.
>
>int keembay_sd_voltage_selection(int volt) {
> int res;
>
> arm_smccc_1_1_invoke(KEEMBAY_SET_SD_VOLTAGE_FUNC_ID, volt,
>&res)
>
> /* appropriate error check if needed here */
>
> return res;
>}
>
>> I will call this func during voltage switching from arasan controller.
>> I believe this implementation require DT to specify the compatible
>> name and method use either smc/hvc.
>
>No, use the standard one as detected by arm_smccc_1_1_invoke (It calls
>arm_smccc_get_conduit internally and use SMC/HVC based on that)
>
>>
>> Are you saying that by using simple smcc based function library I
>> should call below func() in arasan controller. For example
>> 1) arm_smccc_get_version(void)
>> 2) arm_smccc_version_init(arm_smccc_get_version(),
>SMCCC_CONDUIT_SMC);
>
>Nope
>
>> 3) arm_smccc_1_1_invoke(KEEMBAY_SET_SD_VOLTAGE_FUNC_ID,
>voltage_value
>> , &res);
>
>Just this.
Is it ok not using the centralize firmware drivers?
I would just revert back everything as in V1 by directly call the arm_smccc_1_1_invoke in arasan controller.
>
>--
>Regards,
>Sudeep
next prev parent reply other threads:[~2020-10-06 1:14 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-01 14:21 [PATCH v2 0/3] mmc: sdhci-of-arasan: Enable UHS-1 support for Keem Bay SOC muhammad.husaini.zulkifli
2020-10-01 14:21 ` [PATCH v2 1/3] dt-bindings: arm: firmware: Add binding for Keem Bay Firmware Support muhammad.husaini.zulkifli
2020-10-01 14:21 ` [PATCH v2 2/3] firmware: Keem Bay: Add support for Arm Trusted Firmware Service call muhammad.husaini.zulkifli
2020-10-01 15:35 ` Sudeep Holla
2020-10-02 8:23 ` Michal Simek
2020-10-02 10:22 ` Zulkifli, Muhammad Husaini
2020-10-02 11:00 ` Sudeep Holla
2020-10-02 10:58 ` Sudeep Holla
2020-10-02 13:53 ` Michal Simek
2020-10-02 14:51 ` Sudeep Holla
2020-10-03 19:03 ` Zulkifli, Muhammad Husaini
2020-10-05 8:37 ` Zulkifli, Muhammad Husaini
2020-10-05 8:44 ` Sudeep Holla
2020-10-05 17:04 ` Zulkifli, Muhammad Husaini
2020-10-05 20:07 ` Sudeep Holla
2020-10-06 1:14 ` Zulkifli, Muhammad Husaini [this message]
2020-10-06 1:22 ` Zulkifli, Muhammad Husaini
2020-10-06 11:13 ` Sudeep Holla
2020-10-06 11:46 ` Michal Simek
2020-10-06 12:08 ` Michal Simek
2020-10-01 14:21 ` [PATCH v2 3/3] mmc: sdhci-of-arasan: Enable UHS-1 support for Keem Bay SOC muhammad.husaini.zulkifli
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