As part of the "CONFIG_OMAP_RESET_CLOCKS" routine, all the clock are cut which are not acquired/enabled during the boot.
Because of this on OMAP4, memory controller clocks (emif) getting disabled which prevents further boot This patch uses "ENABLE_ON_INIT" flag on the emif clock nodes and adds a check in the reset un-used clock routine to skip such clock nodes. Will updated the auto-gen script for 44xx accordingly The real fix is to have driver for EMIF and do clock get/enable part of it. The EMIF driver is planned to be done HWMOD way so till that point to keep omap3_defconfig booting on OMAP4430, this patch is necessary. Also the cpu_is_44xx() check is added to avoid any impact on the other OMAPs using "ENABLE_ON_INIT" flag The flag usage was suggested by Paul Walmsley Signed-off-by: Santosh Shilimkar <santosh.shilim...@ti.com> Cc: Paul Walmsley <p...@pwsan.com> --- With this patch and Tony's below sram fix, omap3_defconfig boots on OMAP4430 as it is. Tested with 2.6.34 maniline kernel http://www.mail-archive.com/linux-omap@vger.kernel.org/msg27363.html arch/arm/mach-omap2/clock.c | 4 ++++ arch/arm/mach-omap2/clock44xx_data.c | 2 ++ 2 files changed, 6 insertions(+), 0 deletions(-) diff --git a/arch/arm/mach-omap2/clock.c b/arch/arm/mach-omap2/clock.c index a6d0b34..67b531b 100644 --- a/arch/arm/mach-omap2/clock.c +++ b/arch/arm/mach-omap2/clock.c @@ -380,6 +380,10 @@ void omap2_clk_disable_unused(struct clk *clk) { u32 regval32, v; + /* FIXME: Remove this when EMIF driver is ready */ + if (cpu_is_omap44xx() && (clk->flags & ENABLE_ON_INIT)) + return; + v = (clk->flags & INVERT_ENABLE) ? (1 << clk->enable_bit) : 0; regval32 = __raw_readl(clk->enable_reg); diff --git a/arch/arm/mach-omap2/clock44xx_data.c b/arch/arm/mach-omap2/clock44xx_data.c index a5c0c9c..a1b4cae 100644 --- a/arch/arm/mach-omap2/clock44xx_data.c +++ b/arch/arm/mach-omap2/clock44xx_data.c @@ -1369,6 +1369,7 @@ static struct clk emif1_ick = { .ops = &clkops_omap2_dflt, .enable_reg = OMAP4430_CM_MEMIF_EMIF_1_CLKCTRL, .enable_bit = OMAP4430_MODULEMODE_HWCTRL, + .flags = ENABLE_ON_INIT, .clkdm_name = "l3_emif_clkdm", .parent = &ddrphy_ck, .recalc = &followparent_recalc, @@ -1379,6 +1380,7 @@ static struct clk emif2_ick = { .ops = &clkops_omap2_dflt, .enable_reg = OMAP4430_CM_MEMIF_EMIF_2_CLKCTRL, .enable_bit = OMAP4430_MODULEMODE_HWCTRL, + .flags = ENABLE_ON_INIT, .clkdm_name = "l3_emif_clkdm", .parent = &ddrphy_ck, .recalc = &followparent_recalc, -- 1.6.0.4 -- 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
