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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>
This commit is contained in:
Leonard Crestez 2018-07-11 15:11:16 +03:00 committed by Shawn Guo
parent ce397d215c
commit 5507ec5126
1 changed files with 10 additions and 0 deletions
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10
drivers/soc/imx/gpc.c
View File

@ -288,26 +288,31 @@ static struct imx_pm_domain imx_gpc_domains[] = {
struct imx_gpc_dt_data { struct imx_gpc_dt_data {
int num_domains; int num_domains;
bool err009619_present; bool err009619_present;
bool err006287_present;
}; };
static const struct imx_gpc_dt_data imx6q_dt_data = { static const struct imx_gpc_dt_data imx6q_dt_data = {
.num_domains = 2, .num_domains = 2,
.err009619_present = false, .err009619_present = false,
.err006287_present = false,
}; };
static const struct imx_gpc_dt_data imx6qp_dt_data = { static const struct imx_gpc_dt_data imx6qp_dt_data = {
.num_domains = 2, .num_domains = 2,
.err009619_present = true, .err009619_present = true,
.err006287_present = false,
}; };
static const struct imx_gpc_dt_data imx6sl_dt_data = { static const struct imx_gpc_dt_data imx6sl_dt_data = {
.num_domains = 3, .num_domains = 3,
.err009619_present = false, .err009619_present = false,
.err006287_present = true,
}; };
static const struct imx_gpc_dt_data imx6sx_dt_data = { static const struct imx_gpc_dt_data imx6sx_dt_data = {
.num_domains = 4, .num_domains = 4,
.err009619_present = false, .err009619_present = false,
.err006287_present = false,
}; };
static const struct of_device_id imx_gpc_dt_ids[] = { 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 |= imx_gpc_domains[GPC_PGC_DOMAIN_PU].flags |=
PGC_DOMAIN_FLAG_NO_PD; 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) { if (!pgc_node) {
ret = imx_gpc_old_dt_init(&pdev->dev, regmap, ret = imx_gpc_old_dt_init(&pdev->dev, regmap,
of_id_data->num_domains); of_id_data->num_domains);