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From ba573a248dc8c33ff21fc4efbfea0ca85cdbc5d0 Mon Sep 17 00:00:00 2001
From: Ranjith Lohithakshan <ranjithl@ti.com>
Date: Tue, 7 Sep 2010 10:05:11 +0530
Subject: [PATCH 8/9] OMAP3EVM: Set minimum throughput requirement for DSS
GFX_FIFO_UNDERFLOW has been observed when the L3 rate is lowered
below 100MHz or so. Once this underflow happens the display stops
working.
This patch puts a minimum bus throughput requirement when lcd, tv
or dvi displays are enabled. The throughput is calculated in such
a manner that it will translate into a minimum L3 rate of 100MHz.
Signed-off-by: Ranjith Lohithakshan <ranjithl@ti.com>
---
arch/arm/mach-omap2/board-omap3evm.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/board-omap3evm.c b/arch/arm/mach-omap2/board-omap3evm.c
index eb7ad1c..710a25d 100644
--- a/arch/arm/mach-omap2/board-omap3evm.c
+++ b/arch/arm/mach-omap2/board-omap3evm.c
@@ -422,12 +422,15 @@ static int omap3_evm_enable_lcd(struct omap_dss_device *dssdev)
else
gpio_set_value(OMAP3EVM_LCD_PANEL_BKLIGHT_GPIO, 1);
+ omap_pm_set_min_bus_tput(&dssdev->dev, OCP_INITIATOR_AGENT, 400000);
+
lcd_enabled = 1;
return 0;
}
static void omap3_evm_disable_lcd(struct omap_dss_device *dssdev)
{
+ omap_pm_set_min_bus_tput(&dssdev->dev, OCP_INITIATOR_AGENT, 0);
gpio_set_value(OMAP3EVM_LCD_PANEL_ENVDD, 1);
if (get_omap3_evm_rev() >= OMAP3EVM_BOARD_GEN_2)
@@ -449,11 +452,13 @@ static struct omap_dss_device omap3_evm_lcd_device = {
static int omap3_evm_enable_tv(struct omap_dss_device *dssdev)
{
+ omap_pm_set_min_bus_tput(&dssdev->dev, OCP_INITIATOR_AGENT, 400000);
return 0;
}
static void omap3_evm_disable_tv(struct omap_dss_device *dssdev)
{
+ omap_pm_set_min_bus_tput(&dssdev->dev, OCP_INITIATOR_AGENT, 0);
}
static struct omap_dss_device omap3_evm_tv_device = {
@@ -488,12 +493,15 @@ static int omap3_evm_enable_dvi(struct omap_dss_device *dssdev)
omap_mux_set_gpio(OMAP_MUX_MODE3, 3);
}
+ omap_pm_set_min_bus_tput(&dssdev->dev, OCP_INITIATOR_AGENT, 400000);
+
dvi_enabled = 1;
return 0;
}
static void omap3_evm_disable_dvi(struct omap_dss_device *dssdev)
{
+ omap_pm_set_min_bus_tput(&dssdev->dev, OCP_INITIATOR_AGENT, 0);
gpio_set_value(OMAP3EVM_DVI_PANEL_EN_GPIO, 0);
dvi_enabled = 0;
--
1.6.2.4
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