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| author | Leonard Crestez <leonard.crestez@nxp.com> | 2018-07-11 15:11:16 +0300 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2018-07-11 21:18:24 +0800 |
| commit | 5507ec5126df5cad778af22b13fc8c278ad977ea (patch) | |
| tree | 87816dcdbc4f41ee59e3f06959de043940ad4aca /drivers/soc | |
| parent | ce397d215ccd07b8ae3f71db689aedb85d56ab40 (diff) | |
| download | linux-5507ec5126df5cad778af22b13fc8c278ad977ea.tar.gz linux-5507ec5126df5cad778af22b13fc8c278ad977ea.tar.bz2 linux-5507ec5126df5cad778af22b13fc8c278ad977ea.zip | |
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.c | 10 |
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); |