drm: mxsfb: Don't touch AXI clock in IRQ context

The driver attempts agressive power management by enabling and disabling
the AXI clock around register accesses. This results in attempts to
enable and disable the clock in the IRQ handler, which is a no-go as
preparing or unpreparing the clock may sleep.

On the other hand, the driver enables the AXI clock when enabling the
CRTC and keeps it enabled until the CRTC is disabled. This is correct,
and renders the power management attempt pointless, as interrupts are
not supposed to occur when the CRTC is off.

The same reasoning can be applied to the CRTC .enable_vblank() and
.disable_vblank() that are not supposed to be called when the CRTC off
and thus don't require manual handling of the AXI clock. Furthermore,
vblank handling is never enabled, which results in the vblank enable and
disable handlers never being called.

To fix this, remove the manual clock handling in the IRQ, the CRTC
.enable_vblank() and .disable_vblank() handlers and the plane
.atomic_update() handler. We however need to handle the clock manually
in mxsfb_irq_disable() as is calls .disable_vblank() manually and is
used both at probe and remove time.

The clock disabling is also moved to the last step of the
mxsfb_crtc_atomic_disable() function, to prepare for enabling vblank
handling.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Stefan Agner <stefan@agner.ch>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Stefan Agner <stefan@agner.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200727020654.8231-14-laurent.pinchart@ideasonboard.com

1 files changed, 2 insertions, 4 deletions

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index 08b2b2735bc6..cac50fb4fc0f 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -232,7 +232,9 @@ static void mxsfb_irq_disable(struct drm_device *drm)
 {
 	struct mxsfb_drm_private *mxsfb = drm->dev_private;
 
+	mxsfb_enable_axi_clk(mxsfb);
 	mxsfb->crtc.funcs->disable_vblank(&mxsfb->crtc);
+	mxsfb_disable_axi_clk(mxsfb);
 }
 
 static irqreturn_t mxsfb_irq_handler(int irq, void *data)
@@ -241,8 +243,6 @@ static irqreturn_t mxsfb_irq_handler(int irq, void *data)
 	struct mxsfb_drm_private *mxsfb = drm->dev_private;
 	u32 reg;
 
-	mxsfb_enable_axi_clk(mxsfb);
-
 	reg = readl(mxsfb->base + LCDC_CTRL1);
 
 	if (reg & CTRL1_CUR_FRAME_DONE_IRQ)
@@ -250,8 +250,6 @@ static irqreturn_t mxsfb_irq_handler(int irq, void *data)
 
 	writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
 
-	mxsfb_disable_axi_clk(mxsfb);
-
 	return IRQ_HANDLED;
 }