linux-kernel - Re: [PATCH v1 10/11] soc: mediatek: cmdq: add clear option in cmdq_pkt

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Message-ID: <1592840399.1307.15.camel@mtkswgap22>
Date:   Mon, 22 Jun 2020 23:39:59 +0800
From:   Dennis-YC Hsieh <dennis-yc.hsieh@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
CC:     Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, CK Hu <ck.hu@...iatek.com>,
        Bibby Hsieh <bibby.hsieh@...iatek.com>,
        Houlong Wei <houlong.wei@...iatek.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <wsd_upstream@...iatek.com>,
        HS Liao <hs.liao@...iatek.com>
Subject: Re: [PATCH v1 10/11] soc: mediatek: cmdq: add clear option in
 cmdq_pkt_wfe api

Hi Matthias,

thanks for your comment.

On Mon, 2020-06-22 at 13:19 +0200, Matthias Brugger wrote:
> 
> On 21/06/2020 16:18, Dennis YC Hsieh wrote:
> > Add clear parameter to let client decide if
> > event should be clear to 0 after GCE receive it.
> > 
> > Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@...iatek.com>
> > Reviewed-by: CK Hu <ck.hu@...iatek.com>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_drm_crtc.c  |    2 +-
> >  drivers/soc/mediatek/mtk-cmdq-helper.c   |    5 +++--
> >  include/linux/mailbox/mtk-cmdq-mailbox.h |    3 +--
> >  include/linux/soc/mediatek/mtk-cmdq.h    |    5 +++--
> >  4 files changed, 8 insertions(+), 7 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > index 7daaabc26eb1..a065b3a412cf 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > @@ -488,7 +488,7 @@ static void mtk_drm_crtc_hw_config(struct mtk_drm_crtc *mtk_crtc)
> >  	if (mtk_crtc->cmdq_client) {
> >  		cmdq_handle = cmdq_pkt_create(mtk_crtc->cmdq_client, PAGE_SIZE);
> >  		cmdq_pkt_clear_event(cmdq_handle, mtk_crtc->cmdq_event);
> > -		cmdq_pkt_wfe(cmdq_handle, mtk_crtc->cmdq_event);
> > +		cmdq_pkt_wfe(cmdq_handle, mtk_crtc->cmdq_event, false);
> 
> This does not set CMDQ_WFE_UPDATE while the old code did. Is this a bug fix or a
> bug in the code?
> If it's a fix, please provide a fixes tag.

no need to to update again since event always clear before wait.
I'll provide a fix tag, thanks.


Regards,
Dennis

> 
> Thanks,
> Matthias
> 
> >  		mtk_crtc_ddp_config(crtc, cmdq_handle);
> >  		cmdq_pkt_finalize(cmdq_handle);
> >  		cmdq_pkt_flush_async(cmdq_handle, ddp_cmdq_cb, cmdq_handle);
> > diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > index 009f86ae72c6..13f78c9b5901 100644
> > --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> > +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > @@ -315,15 +315,16 @@ int cmdq_pkt_write_s_mask_value(struct cmdq_pkt *pkt, u8 high_addr_reg_idx,
> >  }
> >  EXPORT_SYMBOL(cmdq_pkt_write_s_mask_value);
> >  
> > -int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event)
> > +int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event, bool clear)
> >  {
> >  	struct cmdq_instruction inst = { {0} };
> > +	u32 clear_option = clear ? CMDQ_WFE_UPDATE : 0;
> >  
> >  	if (event >= CMDQ_MAX_EVENT)
> >  		return -EINVAL;
> >  
> >  	inst.op = CMDQ_CODE_WFE;
> > -	inst.value = CMDQ_WFE_OPTION;
> > +	inst.value = CMDQ_WFE_OPTION | clear_option;
> >  	inst.event = event;
> >  
> >  	return cmdq_pkt_append_command(pkt, inst);
> > diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
> > index 3f6bc0dfd5da..42d2a30e6a70 100644
> > --- a/include/linux/mailbox/mtk-cmdq-mailbox.h
> > +++ b/include/linux/mailbox/mtk-cmdq-mailbox.h
> > @@ -27,8 +27,7 @@
> >   * bit 16-27: update value
> >   * bit 31: 1 - update, 0 - no update
> >   */
> > -#define CMDQ_WFE_OPTION			(CMDQ_WFE_UPDATE | CMDQ_WFE_WAIT | \
> > -					CMDQ_WFE_WAIT_VALUE)
> > +#define CMDQ_WFE_OPTION			(CMDQ_WFE_WAIT | CMDQ_WFE_WAIT_VALUE)
> >  
> >  /** cmdq event maximum */
> >  #define CMDQ_MAX_EVENT			0x3ff
> > diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> > index 18364d81e8f7..4b5f5d154bad 100644
> > --- a/include/linux/soc/mediatek/mtk-cmdq.h
> > +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> > @@ -182,11 +182,12 @@ int cmdq_pkt_write_s_mask_value(struct cmdq_pkt *pkt, u8 high_addr_reg_idx,
> >  /**
> >   * cmdq_pkt_wfe() - append wait for event command to the CMDQ packet
> >   * @pkt:	the CMDQ packet
> > - * @event:	the desired event type to "wait and CLEAR"
> > + * @event:	the desired event type to wait
> > + * @clear:	clear event or not after event arrive
> >   *
> >   * Return: 0 for success; else the error code is returned
> >   */
> > -int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event);
> > +int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event, bool clear);
> >  
> >  /**
> >   * cmdq_pkt_clear_event() - append clear event command to the CMDQ packet
> >