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authorLeonard Crestez <leonard.crestez@nxp.com>2018-07-11 15:11:16 +0300
committerShawn Guo <shawnguo@kernel.org>2018-07-11 16:18:24 +0300
commit5507ec5126df5cad778af22b13fc8c278ad977ea (patch)
tree87816dcdbc4f41ee59e3f06959de043940ad4aca /drivers/soc
parentce397d215ccd07b8ae3f71db689aedb85d56ab40 (diff)
downloadlinux-5507ec5126df5cad778af22b13fc8c278ad977ea.tar.xz
soc: imx: gpc: Disable 6sl display power gating for ERR006287
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> Reviewed-by: Lucas Stach <l.stach@pengutronix.de> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'drivers/soc')
-rw-r--r--drivers/soc/imx/gpc.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/soc/imx/gpc.c b/drivers/soc/imx/gpc.c
index 32f0748fd067..13ff983f8b69 100644
--- a/drivers/soc/imx/gpc.c
+++ b/drivers/soc/imx/gpc.c
@@ -288,26 +288,31 @@ 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[] = {
@@ -416,6 +421,11 @@ static int imx_gpc_probe(struct platform_device *pdev)
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);