45 lines
1.6 KiB
Diff
45 lines
1.6 KiB
Diff
From b5ed0359e7d6a489fc8a293d8b427515e08b90dc Mon Sep 17 00:00:00 2001
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From: Darren Etheridge <detheridge@ti.com>
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Date: Tue, 9 Apr 2013 16:49:38 -0500
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Subject: [PATCH 12/15] Fix for screen rolling when video played back in
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browser on BeagleBone Black This value might need some tweaking, but it
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effectively allows the LCDC and the ARM to play fairer in memory, so the LCDC
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does not get starved causing the screen to roll See Page 439 in spruh73g
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(AM33xx TRM) for details
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---
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arch/arm/cpu/armv7/am33xx/ddr.c | 10 ++++++++++
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1 file changed, 10 insertions(+)
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diff --git a/arch/arm/cpu/armv7/am33xx/ddr.c b/arch/arm/cpu/armv7/am33xx/ddr.c
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index d1e2fd3..3a93db1 100644
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--- a/arch/arm/cpu/armv7/am33xx/ddr.c
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+++ b/arch/arm/cpu/armv7/am33xx/ddr.c
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@@ -21,6 +21,12 @@ http://www.ti.com/
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#include <asm/io.h>
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#include <asm/emif.h>
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+/* This value might need some tweaking, but it effectively allows the LCDC */
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+/* and the ARM to play fairer in memory, so the LCDC does not get starved causing */
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+/* the screen to roll */
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+/* See Page 439 in spruh73g (AM33xx TRM) for details */
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+#define AM33XX_INT_CONFIG_COUNT 0x00303030
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+
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/**
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* Base address for EMIF instances
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*/
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@@ -79,6 +85,10 @@ void set_sdram_timings(const struct emif_regs *regs, int nr)
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writel(regs->sdram_tim2, &emif_reg[nr]->emif_sdram_tim_2_shdw);
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writel(regs->sdram_tim3, &emif_reg[nr]->emif_sdram_tim_3);
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writel(regs->sdram_tim3, &emif_reg[nr]->emif_sdram_tim_3_shdw);
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+
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+ /* Configure INT_CONFIG value so that LCDC does not get stalled */
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+ /* for a long time if ARM is accessing memory */
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+ writel(AM33XX_INT_CONFIG_COUNT, &emif_reg[nr]->emif_l3_config);
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}
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/**
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--
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1.8.3.1
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