On 09.01.2019 15:13, Robert Chiras wrote: > 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. Can we maybe even use the runtime PM system for that (adding two callbacks for SET_RUNTIME_PM_OPS)? I suggested it a while ago, but did not looked deeper into it: https://lkml.org/lkml/2018/8/1/300 Since we basically enable on mxsfb_crtc_enable and disable on mxsfb_crtc_disable, I think it would be pretty much the same thing. -- Stefan > > Signed-off-by: Robert Chiras <robert.chiras@xxxxxxx> > Acked-by: Leonard Crestez <leonard.crestez@xxxxxxx> > --- > 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 8d1b6a6..b9437c7 100644 > --- a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c > +++ b/drivers/gpu/drm/mxsfb/mxsfb_crtc.c > @@ -411,7 +411,7 @@ 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); > > @@ -428,7 +428,7 @@ 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, > @@ -456,9 +456,9 @@ 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 135b8e1..5e18353 100644 > --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c > +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c > @@ -103,18 +103,6 @@ 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 > @@ -237,25 +225,31 @@ 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 = { > @@ -440,7 +434,7 @@ 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); > > @@ -449,7 +443,7 @@ 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 c15b4f9..ce98411 100644 > --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.h > +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.h > @@ -47,9 +47,6 @@ 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, _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
