OMAPDSS: HDMI: Disable DDC internal pull up

Disables the internal pull resistor for SDA and SCL which are enabled by
default, as there are external pull up's in 4460 and 4430 ES2.3
SDP, Blaze and Panda Boards, It is done to avoid the EDID read failure.

Signed-off-by: Ricardo Salveti de Araujo <ricardo.salveti@linaro.org>
Signed-off-by: Mythri P K <mythripk@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/arch/arm/mach-omap2/board-4430sdp.c b/arch/arm/mach-omap2/board-4430sdp.c
index 312b158240ed..e1fe304ce361 100644
--- a/arch/arm/mach-omap2/board-4430sdp.c
+++ b/arch/arm/mach-omap2/board-4430sdp.c
@@ -814,7 +814,14 @@ static void omap_4430sdp_display_init(void)
         sdp4430_lcd_init();
         sdp4430_picodlp_init();
         omap_display_init(&sdp4430_dss_data);
-        omap_hdmi_init();
+        /*
+         * OMAP4460SDP/Blaze and OMAP4430 ES2.3 SDP/Blaze boards and
+         * later have external pull up on the HDMI I2C lines
+         */
+        if (cpu_is_omap446x() || omap_rev() > OMAP4430_REV_ES2_2)
+                omap_hdmi_init(OMAP_HDMI_SDA_SCL_EXTERNAL_PULLUP);
+        else
+                omap_hdmi_init(0);
 }
 
 #ifdef CONFIG_OMAP_MUX