Some of the registers, like LCDC_CTRL, CTRL2_OUTSTANDING_REQS and
CTRL1_RECOVERY_ON_UNDERFLOW needs to be properly cleared/initialized
for a better start and stop routine.
Signed-off-by: Robert Chiras <robert.chiras@xxxxxxx>
Tested-by: Guido Günther <agx@xxxxxxxxxxx>
---
drivers/gpu/drm/mxsfb/mxsfb_crtc.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c b/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
index b69ace8..5e44f57 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
@@ -127,6 +127,10 @@ static void mxsfb_enable_controller(struct mxsfb_drm_private *mxsfb)
clk_prepare_enable(mxsfb->clk_disp_axi);
clk_prepare_enable(mxsfb->clk);
+ if (mxsfb->devdata->ipversion >= 4)
+ writel(CTRL2_OUTSTANDING_REQS(REQ_16),
+ mxsfb->base + LCDC_V4_CTRL2 + REG_SET);
+
/* If it was disabled, re-enable the mode again */
writel(CTRL_DOTCLK_MODE, mxsfb->base + LCDC_CTRL + REG_SET);
@@ -136,12 +140,19 @@ static void mxsfb_enable_controller(struct mxsfb_drm_private *mxsfb)
writel(reg, mxsfb->base + LCDC_VDCTRL4);
writel(CTRL_RUN, mxsfb->base + LCDC_CTRL + REG_SET);
+ writel(CTRL1_RECOVERY_ON_UNDERFLOW, mxsfb->base + LCDC_CTRL1 + REG_SET);
}
static void mxsfb_disable_controller(struct mxsfb_drm_private *mxsfb)
{
u32 reg;
+ if (mxsfb->devdata->ipversion >= 4)
+ writel(CTRL2_OUTSTANDING_REQS(0x7),
+ mxsfb->base + LCDC_V4_CTRL2 + REG_CLR);
+
+ writel(CTRL_RUN, mxsfb->base + LCDC_CTRL + REG_CLR);
+
/*
* Even if we disable the controller here, it will still continue
* until its FIFOs are running out of data
@@ -295,6 +306,7 @@ void mxsfb_crtc_enable(struct mxsfb_drm_private *mxsfb)
dma_addr_t paddr;
mxsfb_enable_axi_clk(mxsfb);
+ writel(0, mxsfb->base + LCDC_CTRL);
mxsfb_crtc_mode_set_nofb(mxsfb);
/* Write cur_buf as well to avoid an initial corrupt frame */
--
2.7.4
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