soc: imx: HACK: keep lcdif power domain always on

ISSUE: For some reason elcdif pll goes down during kernel boot.
Use this HACK to keep elcdif pll working until found the root
cause of issue.

NOTE: sc_pm_*() functions can't be call from interrupt contex
(they use IPC calls so can be sleep).
Workaround: don't call a pair clk_prepare_enable()/clk_disable_unprepare()
inside mxsfb_irq_handler();
This solution should be replaced with better one too.

Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>

2 files changed, 6 insertions, 4 deletions

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index 1a12f5e1bd13..e52f0bc6ba75 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -643,17 +643,18 @@ static irqreturn_t mxsfb_irq_handler(int irq, void *data)
 	struct mxsfb_drm_private *mxsfb = drm->dev_private;
 	u32 reg;
 
+/*
 	clk_prepare_enable(mxsfb->clk_axi);
-
+*/
 	reg = readl(mxsfb->base + LCDC_CTRL1);
 
 	if (reg & CTRL1_CUR_FRAME_DONE_IRQ)
 		drm_crtc_handle_vblank(&mxsfb->pipe.crtc);
 
 	writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
-
+/*
 	clk_disable_unprepare(mxsfb->clk_axi);
-
+*/
 	return IRQ_HANDLED;
 }
 
diff --git a/drivers/soc/imx/pm-domains.c b/drivers/soc/imx/pm-domains.c
index a585fa1f802f..771c63084e15 100644
--- a/drivers/soc/imx/pm-domains.c
+++ b/drivers/soc/imx/pm-domains.c
@@ -95,7 +95,8 @@ static int imx8_pd_power(struct generic_pm_domain *domain, bool power_on)
 					pd->rsrc_id == SC_R_HDMI_I2S ||
 					pd->rsrc_id == SC_R_HDMI_I2C_0 ||
 					pd->rsrc_id == SC_R_HDMI_PLL_0 ||
-					pd->rsrc_id == SC_R_HDMI_PLL_1))
+					pd->rsrc_id == SC_R_HDMI_PLL_1 ||
+					pd->rsrc_id == SC_R_ELCDIF_PLL))
 		pd->pd.flags |= GENPD_FLAG_ALWAYS_ON;
 
 	return 0;