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Date:   Wed, 26 Jun 2019 16:32:16 +0300
From:   Robert Chiras <robert.chiras@....com>
To:     Marek Vasut <marex@...x.de>, Stefan Agner <stefan@...er.ch>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>
Cc:     Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Robert Chiras <robert.chiras@....com>
Subject: [PATCH 08/10] drm/mxsfb: Improve the axi clock usage

Currently, the enable of the axi clock return status is ignored, causing
issues when the enable fails then we try to disable it. Therefore, it is
better to check the return status and disable it only when enable
succeeded.
Also, remove the helper functions around clk_axi, since we can directly
use the clk API function for enable/disable the clock. Those functions
are already checking for NULL clk and returning 0 if that's the case.

Signed-off-by: Robert Chiras <robert.chiras@....com>
Acked-by: Leonard Crestez <leonard.crestez@....com>
---
 drivers/gpu/drm/mxsfb/mxsfb_crtc.c |  8 ++++----
 drivers/gpu/drm/mxsfb/mxsfb_drv.c  | 32 +++++++++++++-------------------
 drivers/gpu/drm/mxsfb/mxsfb_drv.h  |  3 ---
 3 files changed, 17 insertions(+), 26 deletions(-)

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c b/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
index d9429fc..45ca16b 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
@@ -403,7 +403,7 @@ void mxsfb_crtc_enable(struct mxsfb_drm_private *mxsfb)
 {
 	dma_addr_t paddr;
 
-	mxsfb_enable_axi_clk(mxsfb);
+	clk_prepare_enable(mxsfb->clk_axi);
 	writel(0, mxsfb->base + LCDC_CTRL);
 	mxsfb_crtc_mode_set_nofb(mxsfb);
 
@@ -420,7 +420,7 @@ void mxsfb_crtc_enable(struct mxsfb_drm_private *mxsfb)
 void mxsfb_crtc_disable(struct mxsfb_drm_private *mxsfb)
 {
 	mxsfb_disable_controller(mxsfb);
-	mxsfb_disable_axi_clk(mxsfb);
+	clk_disable_unprepare(mxsfb->clk_axi);
 }
 
 void mxsfb_plane_atomic_update(struct mxsfb_drm_private *mxsfb,
@@ -448,9 +448,9 @@ void mxsfb_plane_atomic_update(struct mxsfb_drm_private *mxsfb,
 
 	paddr = mxsfb_get_fb_paddr(mxsfb);
 	if (paddr) {
-		mxsfb_enable_axi_clk(mxsfb);
+		clk_prepare_enable(mxsfb->clk_axi);
 		writel(paddr, mxsfb->base + mxsfb->devdata->next_buf);
-		mxsfb_disable_axi_clk(mxsfb);
+		clk_disable_unprepare(mxsfb->clk_axi);
 	}
 
 	if (!fb || !old_fb)
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index 9a1ee70..a164f4d 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -93,18 +93,6 @@ drm_pipe_to_mxsfb_drm_private(struct drm_simple_display_pipe *pipe)
 	return container_of(pipe, struct mxsfb_drm_private, pipe);
 }
 
-void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb)
-{
-	if (mxsfb->clk_axi)
-		clk_prepare_enable(mxsfb->clk_axi);
-}
-
-void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb)
-{
-	if (mxsfb->clk_axi)
-		clk_disable_unprepare(mxsfb->clk_axi);
-}
-
 /**
  * mxsfb_atomic_helper_check - validate state object
  * @dev: DRM device
@@ -225,25 +213,31 @@ static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe,
 static int mxsfb_pipe_enable_vblank(struct drm_simple_display_pipe *pipe)
 {
 	struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
+	int ret = 0;
+
+	ret = clk_prepare_enable(mxsfb->clk_axi);
+	if (ret)
+		return ret;
 
 	/* Clear and enable VBLANK IRQ */
-	mxsfb_enable_axi_clk(mxsfb);
 	writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
 	writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET);
-	mxsfb_disable_axi_clk(mxsfb);
+	clk_disable_unprepare(mxsfb->clk_axi);
 
-	return 0;
+	return ret;
 }
 
 static void mxsfb_pipe_disable_vblank(struct drm_simple_display_pipe *pipe)
 {
 	struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
 
+	if (clk_prepare_enable(mxsfb->clk_axi))
+		return;
+
 	/* Disable and clear VBLANK IRQ */
-	mxsfb_enable_axi_clk(mxsfb);
 	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);
-	mxsfb_disable_axi_clk(mxsfb);
+	clk_disable_unprepare(mxsfb->clk_axi);
 }
 
 static struct drm_simple_display_pipe_funcs mxsfb_funcs = {
@@ -409,7 +403,7 @@ 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);
+	clk_prepare_enable(mxsfb->clk_axi);
 
 	reg = readl(mxsfb->base + LCDC_CTRL1);
 
@@ -418,7 +412,7 @@ 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);
+	clk_disable_unprepare(mxsfb->clk_axi);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.h b/drivers/gpu/drm/mxsfb/mxsfb_drv.h
index 8fb65d3..d6df8fe 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.h
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.h
@@ -37,9 +37,6 @@ struct mxsfb_drm_private {
 int mxsfb_setup_crtc(struct drm_device *dev);
 int mxsfb_create_output(struct drm_device *dev);
 
-void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb);
-void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb);
-
 void mxsfb_crtc_enable(struct mxsfb_drm_private *mxsfb);
 void mxsfb_crtc_disable(struct mxsfb_drm_private *mxsfb);
 void mxsfb_plane_atomic_update(struct mxsfb_drm_private *mxsfb,
-- 
2.7.4

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