linux-kernel - Re: [PATCH 01/16] remoteproc: q6v5-mss: fixup MSM8998 MSS out of reset sequence

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Message-ID: <0101016e844507bb-3be95e27-404d-48bb-a251-e5edf8731d67-000000@us-west-2.amazonses.com>
Date:   Tue, 19 Nov 2019 15:25:46 +0000
From:   Sibi Sankar <sibis@...eaurora.org>
To:     Jeffrey Hugo <jeffrey.l.hugo@...il.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Jeffrey Hugo <jhugo@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Mark Rutland <mark.rutland@....com>, p.zabel@...gutronix.de,
        MSM <linux-arm-msm@...r.kernel.org>,
        linux-remoteproc@...r.kernel.org,
        DTML <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Andy Gross <agross@...nel.org>
Subject: Re: [PATCH 01/16] remoteproc: q6v5-mss: fixup MSM8998 MSS out of
 reset sequence

Hey Jeff,

On 11/19/19 3:24 AM, Jeffrey Hugo wrote:
> On Mon, Nov 18, 2019 at 2:43 PM Sibi Sankar <sibis@...eaurora.org> wrote:
>>
>> Fixup the following in the MSS out of reset sequence on MSM8998:
>> * skip ACC override on MSM8998.
>> * wait for BHS_EN_REST_ACK to be set before setting the LDO to bypass.
>> * remove "mem" clock from the active pool.
> 
> Why any of this is necessary isn't explained.

Honestly the above two fixes didn't seem to have any impact when I
tested it on MSM8998 MTP just making sure that we allign with the
out of reset sequence found on msm-4.4.

> Seems like it should be 3 separate patches.
> Regarding the mem clock change, wouldn't it be an issue if we don't
> vote for that?

we already proxy vote for it though.

> 
>>
>> Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
>> ---
>>   drivers/remoteproc/qcom_q6v5_mss.c | 23 ++++++++++++++++++++---
>>   1 file changed, 20 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
>> index 471128a2e7239..2becf6dade936 100644
>> --- a/drivers/remoteproc/qcom_q6v5_mss.c
>> +++ b/drivers/remoteproc/qcom_q6v5_mss.c
>> @@ -100,6 +100,11 @@
>>   #define QDSP6SS_XO_CBCR                0x0038
>>   #define QDSP6SS_ACC_OVERRIDE_VAL               0x20
>>
>> +/* QDSP6v62 parameters */
>> +#define QDSP6SS_BHS_EN_REST_ACK                BIT(0)
>> +#define BHS_CHECK_MAX_LOOPS            200
>> +#define QDSP6SS_BHS_STATUS             0x0C4
>> +
>>   /* QDSP6v65 parameters */
>>   #define QDSP6SS_SLEEP                   0x3C
>>   #define QDSP6SS_BOOT_CORE_START         0x400
>> @@ -505,8 +510,9 @@ static int q6v5proc_reset(struct q6v5 *qproc)
>>                  int mem_pwr_ctl;
>>
>>                  /* Override the ACC value if required */
>> -               writel(QDSP6SS_ACC_OVERRIDE_VAL,
>> -                      qproc->reg_base + QDSP6SS_STRAP_ACC);
>> +               if (qproc->version == MSS_MSM8996)
>> +                       writel(QDSP6SS_ACC_OVERRIDE_VAL,
>> +                              qproc->reg_base + QDSP6SS_STRAP_ACC);
>>
>>                  /* Assert resets, stop core */
>>                  val = readl(qproc->reg_base + QDSP6SS_RESET_REG);
>> @@ -534,6 +540,18 @@ static int q6v5proc_reset(struct q6v5 *qproc)
>>                  val |= readl(qproc->reg_base + QDSP6SS_PWR_CTL_REG);
>>                  udelay(1);
>>
>> +               /* wait for BHS_EN_REST_ACK to be set */
>> +               if (qproc->version == MSS_MSM8998) {
>> +                       ret = readl_poll_timeout(qproc->reg_base + QDSP6SS_BHS_STATUS,
>> +                                                val, (val & QDSP6SS_BHS_EN_REST_ACK),
>> +                                                1, BHS_CHECK_MAX_LOOPS);
>> +                       if (ret) {
>> +                               dev_err(qproc->dev,
>> +                                       "QDSP6SS_BHS_EN_REST_ACK timedout\n");
>> +                               return -ETIMEDOUT;
>> +                       }
>> +               }
>> +
>>                  /* Put LDO in bypass mode */
>>                  val |= QDSP6v56_LDO_BYP;
>>                  writel(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
>> @@ -1594,7 +1612,6 @@ static const struct rproc_hexagon_res msm8998_mss = {
>>          .active_clk_names = (char*[]){
>>                          "iface",
>>                          "bus",
>> -                       "mem",
>>                          "gpll0_mss",
>>                          "mnoc_axi",
>>                          "snoc_axi",
>> --
>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
>> a Linux Foundation Collaborative Project
>>
> 

-- 
Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc, is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project