From: Leonard Crestez <leonard.crestez@nxp.com>
To: Ulf Hansson <ulf.hansson@linaro.org>,
Lucas Stach <l.stach@pengutronix.de>,
Shawn Guo <shawnguo@kernel.org>
Cc: Fabio Estevam <fabio.estevam@nxp.com>,
linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-imx@nxp.com,
kernel@pengutronix.de
Subject: [PATCH v3 1/2] soc: imx: gpc: Disable 6sl display power gating for ERR006287
Date: Wed, 11 Jul 2018 15:11:16 +0300 [thread overview]
Message-ID: <d694bc32feb1c9638485700ba53cd6e51bea495c.1531310547.git.leonard.crestez@nxp.com> (raw)
In-Reply-To: <cover.1531310547.git.leonard.crestez@nxp.com>
The imx6sl chip errata document describes ERR006287 like this:
> Upon resuming from power gating, the modules in the display power domain
(eLCDIF, EPDC, PXP and SPDC) might fail to perform register reads
correctly.
> When the modules listed above are used, do not use power gating on the
display power domain.
Link: https://www.nxp.com/docs/en/errata/IMX6SLCE.pdf#page=62
Handle this in the safest possible way by keeping the DISP domain
always-on.
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
---
drivers/soc/imx/gpc.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/soc/imx/gpc.c b/drivers/soc/imx/gpc.c
index 526f2d02dc78..f7960f773019 100644
--- a/drivers/soc/imx/gpc.c
+++ b/drivers/soc/imx/gpc.c
@@ -339,30 +339,35 @@ static struct imx_pm_domain imx_gpc_domains[] = {
};
struct imx_gpc_dt_data {
int num_domains;
bool err009619_present;
+ bool err006287_present;
};
static const struct imx_gpc_dt_data imx6q_dt_data = {
.num_domains = 2,
.err009619_present = false,
+ .err006287_present = false,
};
static const struct imx_gpc_dt_data imx6qp_dt_data = {
.num_domains = 2,
.err009619_present = true,
+ .err006287_present = false,
};
static const struct imx_gpc_dt_data imx6sl_dt_data = {
.num_domains = 3,
.err009619_present = false,
+ .err006287_present = true,
};
static const struct imx_gpc_dt_data imx6sx_dt_data = {
.num_domains = 4,
.err009619_present = false,
+ .err006287_present = false,
};
static const struct of_device_id imx_gpc_dt_ids[] = {
{ .compatible = "fsl,imx6q-gpc", .data = &imx6q_dt_data },
{ .compatible = "fsl,imx6qp-gpc", .data = &imx6qp_dt_data },
@@ -467,10 +472,15 @@ static int imx_gpc_probe(struct platform_device *pdev)
/* Disable PU power down in normal operation if ERR009619 is present */
if (of_id_data->err009619_present)
imx_gpc_domains[GPC_PGC_DOMAIN_PU].flags |=
PGC_DOMAIN_FLAG_NO_PD;
+ /* Keep DISP always on if ERR006287 is present */
+ if (of_id_data->err006287_present)
+ imx_gpc_domains[GPC_PGC_DOMAIN_DISPLAY].base.flags |=
+ GENPD_FLAG_ALWAYS_ON;
+
if (!pgc_node) {
ret = imx_gpc_old_dt_init(&pdev->dev, regmap,
of_id_data->num_domains);
if (ret)
return ret;
--
2.17.1
next prev parent reply other threads:[~2018-07-11 12:13 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-11 12:11 [PATCH v3 0/2] Fix imx6sl display power domain Leonard Crestez
2018-07-11 12:11 ` Leonard Crestez [this message]
2018-07-11 12:16 ` [PATCH v3 1/2] soc: imx: gpc: Disable 6sl display power gating for ERR006287 Lucas Stach
2018-07-11 12:21 ` Leonard Crestez
2018-07-11 12:29 ` Lucas Stach
2018-07-11 12:19 ` Ulf Hansson
2018-07-11 12:11 ` [PATCH v3 2/2] ARM: dts: imx6sl: Convert gpc to new bindings Leonard Crestez
2018-07-11 12:17 ` Lucas Stach
2018-07-11 13:20 ` [PATCH v3 0/2] Fix imx6sl display power domain Shawn Guo
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=d694bc32feb1c9638485700ba53cd6e51bea495c.1531310547.git.leonard.crestez@nxp.com \
--to=leonard.crestez@nxp.com \
--cc=fabio.estevam@nxp.com \
--cc=kernel@pengutronix.de \
--cc=l.stach@pengutronix.de \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-imx@nxp.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=shawnguo@kernel.org \
--cc=ulf.hansson@linaro.org \
/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).