code: plan9front

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imx8: fix reduced lcdif pix clk workaround by enabling underflow recovery

--- a/sys/src/9/imx8/lcd.c

+++ b/sys/src/9/imx8/lcd.c

@@ -461,7 +461,10 @@

 	wr(lcdif, LCDIF_CTRL1_SET, CTRL1_FIFO_CLEAR);

 	wr(lcdif, LCDIF_AS_CTRL, 0);

-	wr(lcdif, LCDIF_CTRL1, sm(7, CTRL1_BYTE_PACKING_FORMAT));

+	/* enable underflow recovery to fix image shift */

+	wr(lcdif, LCDIF_CTRL1,

+		sm(7, CTRL1_BYTE_PACKING_FORMAT) |

+		CTRL1_RECOVER_ON_UNDERFLOW);

 	wr(lcdif, LCDIF_CTRL,

 		CTRL_BYPASS_COUNT |

@@ -911,12 +914,8 @@

 		goto out;

 	}

-	/*

-	 * start the pixel clock. running at the actual pixel clock

-	 * causes the screen to shift horizontally after a while.

-	 * using 80% seems to fix it - for now.

-	 */

-	setclkrate("lcdif.pix_clk", "system_pll1_clk", (mode.pixclk*8)/10);

+	/* start the pixel clock */

+	setclkrate("lcdif.pix_clk", "system_pll1_clk", mode.pixclk);

 	dpiinit(&mode);

 	/* release dpi reset */