[PATCH 3/9] drm: mxsfb: Simplify LCDIF IRQ handling

[Marek Vasut]

The call to drm_crtc_vblank_off(&lcdif->crtc); disables IRQ generation
from the LCDIF block already and this is called in mxsfb_load() before
request_irq(), so explicitly disabling IRQ using custom function like
mxsfb_irq_disable() is not needed, remove it. The request_irq() call
would return -ENOTCONN if IRQ is IRQ_NOTCONNECTED already, so remove
the unnecessary check. Finally, remove both mxsfb_irq_install() and
mxsfb_irq_uninstall() as well, since they are no longer useful.

Signed-off-by: Marek Vasut <ma...@denx.de>
Cc: Alexander Stein <alexander.st...@ew.tq-group.com>
Cc: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Cc: Lucas Stach <l.st...@pengutronix.de>
Cc: Peng Fan <peng....@nxp.com>
Cc: Robby Cai <robby....@nxp.com>
Cc: Sam Ravnborg <s...@ravnborg.org>
Cc: Stefan Agner <ste...@agner.ch>
---
 drivers/gpu/drm/mxsfb/mxsfb_drv.c | 38 +++++++------------------------
 1 file changed, 8 insertions(+), 30 deletions(-)

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c 
b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index bb15e32d8a014..11298df50917c 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -156,33 +156,6 @@ static irqreturn_t mxsfb_irq_handler(int irq, void *data)
        return IRQ_HANDLED;
 }
 
-static void mxsfb_irq_disable(struct drm_device *drm)
-{
-       struct mxsfb_drm_private *mxsfb = drm->dev_private;
-
-       /* Disable and clear VBLANK IRQ */
-       writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
-       writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
-}
-
-static int mxsfb_irq_install(struct drm_device *dev, int irq)
-{
-       if (irq == IRQ_NOTCONNECTED)
-               return -ENOTCONN;
-
-       mxsfb_irq_disable(dev);
-
-       return request_irq(irq, mxsfb_irq_handler, 0,  dev->driver->name, dev);
-}
-
-static void mxsfb_irq_uninstall(struct drm_device *dev)
-{
-       struct mxsfb_drm_private *mxsfb = dev->dev_private;
-
-       mxsfb_irq_disable(dev);
-       free_irq(mxsfb->irq, dev);
-}
-
 static int mxsfb_load(struct drm_device *drm,
                      const struct mxsfb_devdata *devdata)
 {
@@ -261,7 +234,8 @@ static int mxsfb_load(struct drm_device *drm,
                return ret;
        mxsfb->irq = ret;
 
-       ret = mxsfb_irq_install(drm, mxsfb->irq);
+       ret = request_irq(mxsfb->irq, mxsfb_irq_handler, 0,
+                         drm->driver->name, drm);
        if (ret < 0) {
                dev_err(drm->dev, "Failed to install IRQ handler\n");
                return ret;
@@ -278,16 +252,20 @@ static int mxsfb_load(struct drm_device *drm,
 
 static void mxsfb_unload(struct drm_device *drm)
 {
+       struct mxsfb_drm_private *mxsfb = drm->dev_private;
+
        pm_runtime_get_sync(drm->dev);
 
+       drm_crtc_vblank_off(&mxsfb->crtc);
+
        drm_kms_helper_poll_fini(drm);
        drm_mode_config_cleanup(drm);
 
-       mxsfb_irq_uninstall(drm);
-
        pm_runtime_put_sync(drm->dev);
        pm_runtime_disable(drm->dev);
 
+       free_irq(mxsfb->irq, drm->dev);
+
        drm->dev_private = NULL;
 }
 
-- 
2.34.1