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Subject[PATCH v3 1/2] soc: imx: gpc: Disable 6sl display power gating for ERR006287
Date
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
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