* Aaro Koskinen <aaro.koski...@iki.fi> [111112 03:42]: > Hi, > > On Thu, 10 Nov 2011, Tony Lindgren wrote: > >* Aaro Koskinen <aaro.koski...@iki.fi> [111110 13:31]: > >>--- a/arch/arm/mach-omap1/clock_data.c > >>+++ b/arch/arm/mach-omap1/clock_data.c > >>@@ -774,14 +774,6 @@ int __init omap1_clk_init(void) > >> int crystal_type = 0; /* Default 12 MHz */ > >> u32 reg, cpu_mask; > >> > >>-#ifdef CONFIG_DEBUG_LL > >>- /* > >>- * Resets some clocks that may be left on from bootloader, > >>- * but leaves serial clocks on. > >>- */ > >>- omap_writel(0x3 << 29, MOD_CONF_CTRL_0); > >>-#endif > >>- > >> /* USB_REQ_EN will be disabled later if necessary (usb_dc_ck) */ > >> reg = omap_readw(SOFT_REQ_REG) & (1 << 4); > >> omap_writew(reg, SOFT_REQ_REG); > > > >Hmm that should keep the serial clocks on. What other bit(s) need to > >be on in MOD_CONF_CTRL_0 for you in addition to the serial bits? > > On my board those serial bits are zero during the early boot (and the > serial works). By setting those bits the clock will switch from 12 -> > 48 MHz and I guess the baud rate will change and that's why the output > turns into garbage.
OK, looks like on OSK5912 the uart1 serial bit is zero and must be set.. > So I think the code should reset the other bits, and leave serial bits > untouched: Sounds like we need SoC specific init_early for omap1 too. That way we can also get rid of the CONFIG_OMAP_ARM_XXXMHZ Kconfig options that are needed to make omap1_defconfig more usable. Regards, Tony > diff --git a/arch/arm/mach-omap1/clock_data.c > b/arch/arm/mach-omap1/clock_data.c > index 1297bb5..b3b69d8 100644 > --- a/arch/arm/mach-omap1/clock_data.c > +++ b/arch/arm/mach-omap1/clock_data.c > @@ -788,7 +788,11 @@ int __init omap1_clk_init(void) > * Resets some clocks that may be left on from bootloader, > * but leaves serial clocks on. > */ > - omap_writel(0x3 << 29, MOD_CONF_CTRL_0); > + reg = omap_readl(MOD_CONF_CTRL_0) & > + ((1 << CONF_MOD_UART1_CLK_MODE_R) | > + (1 << CONF_MOD_UART2_CLK_MODE_R) | > + (1 << CONF_MOD_UART3_CLK_MODE_R)); > + omap_writel(reg, MOD_CONF_CTRL_0); > #endif > > /* USB_REQ_EN will be disabled later if necessary (usb_dc_ck) */ > -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
