From: Matthias Brugger <matthias.bgg@gmail.com>
To: sean.wang@mediatek.com, robh+dt@kernel.org, mark.rutland@arm.com,
marcel@holtmann.org, johan.hedberg@gmail.com
Cc: devicetree@vger.kernel.org, linux-bluetooth@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
Ulf Hansson <ulf.hansson@linaro.org>,
Weiyi Lu <weiyi.lu@mediatek.com>
Subject: Re: [PATCH v1 5/7] soc: mediatek: add a fixed wait for SRAM stable
Date: Thu, 19 Apr 2018 12:33:37 +0200 [thread overview]
Message-ID: <5f2530a0-aee2-39fe-eb5c-56cd4a68c9db@gmail.com> (raw)
In-Reply-To: <0fc10b2498c6dbe20141831c722c32cc74330d3d.1522736996.git.sean.wang@mediatek.com>
On 04/03/2018 09:15 AM, sean.wang@mediatek.com wrote:
> From: Sean Wang <sean.wang@mediatek.com>
>
> MT7622_POWER_DOMAIN_WB doesn't send an ACK when its managed SRAM becomes
> stable, which is not like the behavior the other power domains should
> have. Therefore, it's necessary for such a power domain to have a fixed
> and well-predefined duration to wait until its managed SRAM can be allowed
> to access by all functions running on the top.
>
> Signed-off-by: Sean Wang <sean.wang@mediatek.com>
> Cc: Matthias Brugger <matthias.bgg@gmail.com>
> Cc: Ulf Hansson <ulf.hansson@linaro.org>
> Cc: Weiyi Lu <weiyi.lu@mediatek.com>
> ---
> drivers/soc/mediatek/mtk-scpsys.c | 17 ++++++++++++-----
> 1 file changed, 12 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
> index f9b7248..19aceb8 100644
> --- a/drivers/soc/mediatek/mtk-scpsys.c
> +++ b/drivers/soc/mediatek/mtk-scpsys.c
> @@ -121,6 +121,7 @@ struct scp_domain_data {
> u32 bus_prot_mask;
> enum clk_id clk_id[MAX_CLKS];
> bool active_wakeup;
> + u32 us_sram_fwait;
Before adding more and more fields to scp_domain_data which get checked in if's,
I'd prefer to add a caps field used for bus_prot_mask, active_wakeup in a first
patch and add the cap FORCE_WAIT in a second patch.
Can you help to implement this Sean, or shall I give it a try?
Regards,
Matthias
> };
>
> struct scp;
> @@ -234,11 +235,16 @@ static int scpsys_power_on(struct generic_pm_domain *genpd)
> val &= ~scpd->data->sram_pdn_bits;
> writel(val, ctl_addr);
>
> - /* wait until SRAM_PDN_ACK all 0 */
> - ret = readl_poll_timeout(ctl_addr, tmp, (tmp & pdn_ack) == 0,
> - MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> - if (ret < 0)
> - goto err_pwr_ack;
> + /* Either wait until SRAM_PDN_ACK all 0 or have a force wait */
> + if (!scpd->data->us_sram_fwait) {
> + ret = readl_poll_timeout(ctl_addr, tmp, (tmp & pdn_ack) == 0,
> + MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> + if (ret < 0)
> + goto err_pwr_ack;
> + } else {
> + usleep_range(scpd->data->us_sram_fwait,
> + scpd->data->us_sram_fwait + 100);
> + };
>
> if (scpd->data->bus_prot_mask) {
> ret = mtk_infracfg_clear_bus_protection(scp->infracfg,
> @@ -783,6 +789,7 @@ static const struct scp_domain_data scp_domain_data_mt7622[] = {
> .clk_id = {CLK_NONE},
> .bus_prot_mask = MT7622_TOP_AXI_PROT_EN_WB,
> .active_wakeup = true,
> + .us_sram_fwait = 12000,
> },
> };
>
>
next prev parent reply other threads:[~2018-04-19 10:33 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-03 7:15 [PATCH v1 0/7] add support for Bluetooth on MT7622 SoC sean.wang
2018-04-03 7:15 ` [PATCH v1 1/7] dt-bindings: net: bluetooth: Add mediatek-bluetooth sean.wang
2018-04-09 21:16 ` Rob Herring
2018-04-03 7:15 ` [PATCH v1 2/7] serdev: add dev_pm_domain_attach|detach() sean.wang
2018-04-03 10:29 ` Marcel Holtmann
2018-04-26 5:29 ` Sean Wang
2018-04-03 7:15 ` [PATCH v1 3/7] soc: mediatek: reuse read[l,x]_poll_timeout helpers sean.wang
2018-04-18 15:06 ` Matthias Brugger
2018-04-03 7:15 ` [PATCH v1 4/7] soc: mediatek: reuse regmap_read_poll_timeout helpers sean.wang
2018-04-19 10:23 ` Matthias Brugger
2018-04-20 3:42 ` Sean Wang
2018-04-03 7:15 ` [PATCH v1 5/7] soc: mediatek: add a fixed wait for SRAM stable sean.wang
2018-04-19 10:33 ` Matthias Brugger [this message]
2018-04-20 3:49 ` Sean Wang
2018-04-23 8:58 ` Sean Wang
2018-04-03 7:15 ` [PATCH v1 6/7] Bluetooth: hci_mediatek: Add protocol support for MediaTek serial devices sean.wang
2018-04-03 10:27 ` Marcel Holtmann
2018-04-26 7:34 ` Sean Wang
2018-04-26 9:47 ` Marcel Holtmann
2018-04-27 4:13 ` Sean Wang
2018-04-27 5:25 ` Marcel Holtmann
2018-04-27 9:14 ` Sean Wang
2018-04-27 16:34 ` Marcel Holtmann
2018-05-08 6:48 ` Sean Wang
2018-05-08 7:27 ` Marcel Holtmann
2018-05-08 8:22 ` Sean Wang
2018-05-08 11:18 ` Marcel Holtmann
2018-05-10 6:45 ` Sean Wang
2018-04-03 12:13 ` [RFC PATCH] Bluetooth: hci_mediatek: mtk_recv_frame() can be static kbuild test robot
2018-04-03 12:13 ` [PATCH v1 6/7] Bluetooth: hci_mediatek: Add protocol support for MediaTek serial devices kbuild test robot
2018-04-03 7:15 ` [PATCH v1 7/7] MAINTAINERS: add an entry for MediaTek Bluetooth driver sean.wang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5f2530a0-aee2-39fe-eb5c-56cd4a68c9db@gmail.com \
--to=matthias.bgg@gmail.com \
--cc=devicetree@vger.kernel.org \
--cc=johan.hedberg@gmail.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-bluetooth@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mediatek@lists.infradead.org \
--cc=marcel@holtmann.org \
--cc=mark.rutland@arm.com \
--cc=robh+dt@kernel.org \
--cc=sean.wang@mediatek.com \
--cc=ulf.hansson@linaro.org \
--cc=weiyi.lu@mediatek.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).