Merge tag 'imx-drivers-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux into next/drivers

i.MX drivers update for 4.19:
 - Handle i.MX6SL chip errata ERR006287 in the safest possible way by
   keeping the DISP domain always-on, because Upon resuming from power
   gating, the modules in the display power domain (eLCDIF, EPDC, PXP
   and SPDC) might fail to perform register reads correctly.
 - Use GENPD_FLAG_ALWAYS_ON flag for i.MX6QP PU ERR009619 handling.
   It is functionally identical to the exsiting implementation but
   simpler and slightly faster.

* tag 'imx-drivers-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux:
  soc: imx6qp: Use GENPD_FLAG_ALWAYS_ON for PU errata
  soc: imx: gpc: Disable 6sl display power gating for ERR006287

Signed-off-by: Olof Johansson <olof@lixom.net>

1 files changed, 12 insertions, 6 deletions

diff --git a/drivers/soc/imx/gpc.c b/drivers/soc/imx/gpc.c
index 32f0748fd067..403f3f2f43bd 100644
--- a/drivers/soc/imx/gpc.c
+++ b/drivers/soc/imx/gpc.c
@@ -47,7 +47,6 @@ struct imx_pm_domain {
 	unsigned int reg_offs;
 	signed char cntr_pdn_bit;
 	unsigned int ipg_rate_mhz;
-	unsigned int flags;
 };
 
 static inline struct imx_pm_domain *
@@ -62,9 +61,6 @@ static int imx6_pm_domain_power_off(struct generic_pm_domain *genpd)
 	int iso, iso2sw;
 	u32 val;
 
-	if (pd->flags & PGC_DOMAIN_FLAG_NO_PD)
-		return -EBUSY;
-
 	/* Read ISO and ISO2SW power down delays */
 	regmap_read(pd->regmap, pd->reg_offs + GPC_PGC_PUPSCR_OFFS, &val);
 	iso = val & 0x3f;
@@ -288,26 +284,31 @@ 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[] = {
@@ -413,8 +414,13 @@ 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;
+		imx_gpc_domains[GPC_PGC_DOMAIN_PU].base.flags |=
+				GENPD_FLAG_ALWAYS_ON;
+
+	/* 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,