From: Mythri P K <[email protected]> Disables the internal pull resistor for SDA and SCL enabled by default as there are expernal pull up's to avoid the EDID read failure.
Signed-off-by: Ricardo Salveti de Araujo <[email protected]> --- arch/arm/mach-omap2/board-4430sdp.c | 18 ++++++++++++++++++ 1 files changed, 18 insertions(+), 0 deletions(-) diff --git a/arch/arm/mach-omap2/board-4430sdp.c b/arch/arm/mach-omap2/board-4430sdp.c index 6d16306..75f7cd0 100644 --- a/arch/arm/mach-omap2/board-4430sdp.c +++ b/arch/arm/mach-omap2/board-4430sdp.c @@ -603,6 +603,9 @@ static void __init omap_sfh7741prox_init(void) static void sdp4430_hdmi_mux_init(void) { + u32 reg; + u16 control_i2c_1; + /* PAD0_HDMI_HPD_PAD1_HDMI_CEC */ omap_mux_init_signal("hdmi_hpd", OMAP_PIN_INPUT_PULLUP); @@ -613,6 +616,21 @@ static void sdp4430_hdmi_mux_init(void) OMAP_PIN_INPUT_PULLUP); omap_mux_init_signal("hdmi_ddc_sda", OMAP_PIN_INPUT_PULLUP); + + /* + * CONTROL_I2C_1: HDMI_DDC_SDA_PULLUPRESX (bit 28) and + * HDMI_DDC_SCL_PULLUPRESX (bit 24) are set to disable + * internal pull up resistor - This is a change needed in + * OMAP4460 and OMAP4430 ES2.3 as the external pull up + * are present. This is needed to avoid EDID read failure. + */ + if (cpu_is_omap446x() || (omap_rev() > OMAP4430_REV_ES2_2)) { + control_i2c_1 = OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_I2C_1; + reg = omap4_ctrl_pad_readl(control_i2c_1); + reg |= (OMAP4_HDMI_DDC_SDA_PULLUPRESX_MASK | + OMAP4_HDMI_DDC_SCL_PULLUPRESX_MASK); + omap4_ctrl_pad_writel(reg, control_i2c_1); + } } static struct gpio sdp4430_hdmi_gpios[] = { -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
