From: Dennis-YC Hsieh <dennis-yc.hsieh@mediatek.com>
To: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
devicetree@vger.kernel.org, wsd_upstream@mediatek.com,
David Airlie <airlied@linux.ie>,
Jassi Brar <jassisinghbrar@gmail.com>,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
HS Liao <hs.liao@mediatek.com>, Rob Herring <robh+dt@kernel.org>,
linux-mediatek@lists.infradead.org,
Houlong Wei <houlong.wei@mediatek.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v5 09/13] soc: mediatek: cmdq: add write_s value function
Date: Mon, 25 May 2020 10:27:01 +0800 [thread overview]
Message-ID: <1590373621.31522.7.camel@mtkswgap22> (raw)
In-Reply-To: <eb604637-28f0-fa8f-ce4b-3e87f6c944ad@gmail.com>
On Sun, 2020-05-24 at 20:13 +0200, Matthias Brugger wrote:
>
> On 24/05/2020 19:31, Dennis-YC Hsieh wrote:
> > Hi Matthias,
> >
> > Thanks for your comment.
> >
> > On Sat, 2020-05-16 at 20:20 +0200, Matthias Brugger wrote:
> >>
> >> On 08/03/2020 11:52, Dennis YC Hsieh wrote:
> >>> add write_s function in cmdq helper functions which
> >>> writes a constant value to address with large dma
> >>> access support.
> >>>
> >>> Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@mediatek.com>
> >>> Reviewed-by: CK Hu <ck.hu@mediatek.com>
> >>> ---
> >>> drivers/soc/mediatek/mtk-cmdq-helper.c | 26 ++++++++++++++++++++++++++
> >>> include/linux/soc/mediatek/mtk-cmdq.h | 14 ++++++++++++++
> >>> 2 files changed, 40 insertions(+)
> >>>
> >>> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> >>> index 03c129230cd7..a9ebbabb7439 100644
> >>> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> >>> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> >>> @@ -269,6 +269,32 @@ int cmdq_pkt_write_s(struct cmdq_pkt *pkt, u16 high_addr_reg_idx,
> >>> }
> >>> EXPORT_SYMBOL(cmdq_pkt_write_s);
> >>>
> >>> +int cmdq_pkt_write_s_value(struct cmdq_pkt *pkt, u16 high_addr_reg_idx,
> >>> + u16 addr_low, u32 value, u32 mask)
> >>> +{
> >>> + struct cmdq_instruction inst = { {0} };
> >>> + int err;
> >>> +
> >>> + if (mask != U32_MAX) {
> >>> + inst.op = CMDQ_CODE_MASK;
> >>> + inst.mask = ~mask;
> >>> + err = cmdq_pkt_append_command(pkt, inst);
> >>> + if (err < 0)
> >>> + return err;
> >>> +
> >>> + inst.op = CMDQ_CODE_WRITE_S_MASK;
> >>> + } else {
> >>> + inst.op = CMDQ_CODE_WRITE_S;
> >>> + }
> >>> +
> >>> + inst.sop = high_addr_reg_idx;
> >>
> >> Writing u16 value in a 5 bit wide variable?
> >
> > We need only 5 bits in this case. I'll change high_addr_reg_idx
> > parameter to u8.
> >
>
> Ok, please make sure to mask the value, so that it's explicit in the code that
> we only use the lowest 5 bits of high_addr_reg_idx.
Is it necessary to mask the value?
Since sop already defined as "u8 sop:5;", I thought it is explicit that
only use 5 bits and compiler should do the rest jobs.
Regards,
Dennis
>
> Regards,
> Matthias
>
> >>
> >>> + inst.offset = addr_low;
> >>> + inst.value = value;
> >>> +
> >>> + return cmdq_pkt_append_command(pkt, inst);
> >>> +}
> >>> +EXPORT_SYMBOL(cmdq_pkt_write_s_value);
> >>> +
> >>> int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event)
> >>> {
> >>> struct cmdq_instruction inst = { {0} };
> >>> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> >>> index 01b4184af310..fec292aac83c 100644
> >>> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> >>> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> >>> @@ -135,6 +135,20 @@ int cmdq_pkt_read_s(struct cmdq_pkt *pkt, u16 high_addr_reg_idx, u16 addr_low,
> >>> int cmdq_pkt_write_s(struct cmdq_pkt *pkt, u16 high_addr_reg_idx,
> >>> u16 addr_low, u16 src_reg_idx, u32 mask);
> >>>
> >>> +/**
> >>> + * cmdq_pkt_write_s_value() - append write_s command with mask to the CMDQ
> >>> + * packet which write value to a physical address
> >>> + * @pkt: the CMDQ packet
> >>> + * @high_addr_reg_idx: internal regisger ID which contains high address of pa
> >>
> >> register
> >
> > will fix
> >
> >
> > Regards,
> > Dennis
> >
> >>
> >>> + * @addr_low: low address of pa
> >>> + * @value: the specified target value
> >>> + * @mask: the specified target mask
> >>> + *
> >>> + * Return: 0 for success; else the error code is returned
> >>> + */
> >>> +int cmdq_pkt_write_s_value(struct cmdq_pkt *pkt, u16 high_addr_reg_idx,
> >>> + u16 addr_low, u32 value, u32 mask);
> >>> +
> >>> /**
> >>> * cmdq_pkt_wfe() - append wait for event command to the CMDQ packet
> >>> * @pkt: the CMDQ packet
> >>>
> >
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next prev parent reply other threads:[~2020-05-25 7:21 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-08 10:52 [PATCH v5 00/13] support gce on mt6779 platform Dennis YC Hsieh
2020-03-08 10:52 ` [PATCH v5 01/13] dt-binding: gce: add gce header file for mt6779 Dennis YC Hsieh
2020-03-08 10:52 ` [PATCH v5 02/13] mailbox: cmdq: variablize address shift in platform Dennis YC Hsieh
2020-03-20 1:05 ` Jassi Brar
2020-03-23 1:11 ` Dennis-YC Hsieh
2020-03-08 10:52 ` [PATCH v5 03/13] mailbox: cmdq: support mt6779 gce platform definition Dennis YC Hsieh
2020-05-16 16:10 ` Matthias Brugger
2020-03-08 10:52 ` [PATCH v5 04/13] mailbox: mediatek: cmdq: clear task in channel before shutdown Dennis YC Hsieh
2020-03-08 10:52 ` [PATCH v5 05/13] soc: mediatek: cmdq: return send msg error code Dennis YC Hsieh
2020-05-16 17:56 ` Matthias Brugger
2020-03-08 10:52 ` [PATCH v5 06/13] soc: mediatek: cmdq: add assign function Dennis YC Hsieh
2020-05-16 17:59 ` Matthias Brugger
2020-05-24 17:01 ` Dennis-YC Hsieh
2020-05-24 18:09 ` Matthias Brugger
2020-03-08 10:52 ` [PATCH v5 07/13] soc: mediatek: cmdq: add write_s function Dennis YC Hsieh
2020-05-16 18:14 ` Matthias Brugger
2020-05-24 17:26 ` Dennis-YC Hsieh
2020-05-24 18:12 ` Matthias Brugger
2020-03-08 10:52 ` [PATCH v5 08/13] soc: mediatek: cmdq: add read_s function Dennis YC Hsieh
2020-03-08 10:52 ` [PATCH v5 09/13] soc: mediatek: cmdq: add write_s value function Dennis YC Hsieh
2020-05-16 18:20 ` Matthias Brugger
2020-05-24 17:31 ` Dennis-YC Hsieh
2020-05-24 18:13 ` Matthias Brugger
2020-05-25 2:27 ` Dennis-YC Hsieh [this message]
2020-05-25 8:39 ` Matthias Brugger
2020-05-25 10:38 ` Dennis-YC Hsieh
2020-05-25 13:59 ` Matthias Brugger
2020-03-08 10:52 ` [PATCH v5 10/13] soc: mediatek: cmdq: export finalize function Dennis YC Hsieh
2020-05-16 18:22 ` Matthias Brugger
2020-05-24 17:32 ` Dennis-YC Hsieh
2020-05-25 0:23 ` Chun-Kuang Hu
2020-05-25 8:38 ` Matthias Brugger
2020-05-25 10:48 ` Chun-Kuang Hu
2020-03-08 10:52 ` [PATCH v5 11/13] soc: mediatek: cmdq: add jump function Dennis YC Hsieh
2020-03-09 1:48 ` CK Hu
2020-03-08 10:52 ` [PATCH v5 12/13] soc: mediatek: cmdq: add clear option in cmdq_pkt_wfe api Dennis YC Hsieh
2020-03-09 2:07 ` CK Hu
2020-05-16 18:30 ` Matthias Brugger
2020-05-24 17:32 ` Dennis-YC Hsieh
2020-03-08 10:52 ` [PATCH v5 13/13] soc: mediatek: cmdq: add set event function Dennis YC Hsieh
2020-05-16 18:32 ` Matthias Brugger
2020-05-24 17:39 ` Dennis-YC Hsieh
2020-05-24 18:15 ` Matthias Brugger
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