[U-Boot] Framebuffer support hangs kernel on mx53loco

[Troy Kisky <troy.kisky@boundarydevices.com>]

On 5/14/2012 10:27 AM, Fabio Estevam wrote:
> Hi Stefano/Anatolij,
>
> When I activate framebuffer support for mx53loco board I face the
> following problem (in about half of my attempts to boot the kernel):
>
> Starting kernel ...
>
> Linux version 2.6.35.3-01129-g691c08a (fabio at fabio-Latitude-E6410)
> (gcc version 4.4.4 (4.4.4_09.06.2010) ) #5 PREEMPT Mon May 14 14:22:49
> BRT 2012
> CPU: ARMv7 Processor [412fc085] revision 5 (ARMv7), cr=10c53c7f
> CPU: VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
> Machine: Freescale MX53 LOCO Board
> Memory policy: ECC disabled, Data cache writeback
> Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 250880
> Kernel command line: console=ttymxc0,115200 root=/dev/nfs ip=dhcp
> nfsroot=10.29.240.143:,v3,tcp
> PID hash table entries: 4096 (order: 2, 16384 bytes)
> Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
> Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
> Memory: 480MB 512MB = 992MB total
> Memory: 998528k/998528k available, 17280k reserved, 0K highmem
> Virtual kernel memory layout:
>      vector  : 0xffff0000 - 0xffff1000   (   4 kB)
>      fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
>      DMA     : 0xf9e00000 - 0xffe00000   (  96 MB)
>      vmalloc : 0xe0800000 - 0xf4000000   ( 312 MB)
>      lowmem  : 0x80000000 - 0xe0000000   (1536 MB)
>      pkmap   : 0x7fe00000 - 0x80000000   (   2 MB)
>      modules : 0x7f000000 - 0x7fe00000   (  14 MB)
>        .init : 0x80008000 - 0x80032000   ( 168 kB)
>        .text : 0x80032000 - 0x807b4000   (7688 kB)
>        .data : 0x807d0000 - 0x808234c0   ( 334 kB)
> SLUB: Genslabs=11, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
> Hierarchical RCU implementation.
>          RCU-based detection of stalled CPUs is disabled.
>          Verbose stalled-CPUs detection is disabled.
> NR_IRQS:368
> MXC GPIO hardware
> MXC IRQ initialized
> MXC_Early serial console at MMIO 0x53fbc000 (options '115200')
> bootconsole [ttymxc0] enabled
> Console: colour dummy device 80x30
> Calibrating delay loop... 799.53 BogoMIPS (lpj=3997696)
> pid_max: default: 32768 minimum: 301
> Mount-cache hash table entries: 512
> CPU: Testing write buffer coherency: ok
> regulator: core version 0.5
> NET: Registered protocol family 16
> i.MX IRAM pool: 128 KB at 0xe0840000
> IRAM READY
> CPU is i.MX53 Revision 2.1
>
> (system hangs here)
>
> When framebuffer is not used I can succesfully reboot the board several times.
>
> I know it is a difficult question, but in case you have any
> ideas/suggestions I would be glad to listen to.
>
> Regards,
>
> Fabio Estevam
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot
>
This patch (though you can't apply it directly) may give you a clue.


Author: Troy Kisky <troy.kisky@boundarydevices.com>
Date:   Tue Jan 24 14:46:29 2012 -0700

     squash with dont_sleep, fix non-lvds boot

diff --git a/arch/arm/mach-mx5/clock.c b/arch/arm/mach-mx5/clock.c
index faecc34..efe324c 100644
--- a/arch/arm/mach-mx5/clock.c
+++ b/arch/arm/mach-mx5/clock.c
@@ -4581,6 +4581,19 @@ static void clk_tree_init(void)
         }
  }

+#define IPU_CONF               0x000
+#define IPU_DISP_GEN           0x0C4
+
+void turn_off_display(int physical_base) {
+       void __iomem *ipuc = ioremap(physical_base, SZ_4K);
+       if (ipuc) {
+               /* clear DI0/DI1 counter release */
+               unsigned reg = __raw_readl(ipuc + IPU_DISP_GEN);
+               __raw_writel(reg & ~(3 << 24), ipuc + IPU_DISP_GEN);
+               __raw_writel(0, ipuc + IPU_CONF);
+               iounmap(ipuc);
+       }
+}

  int __init mx51_clocks_init(unsigned long ckil, unsigned long osc, 
unsigned long ckih1, unsigned long ckih2)
  {
@@ -4590,6 +4603,7 @@ int __init mx51_clocks_init(unsigned long ckil, 
unsigned long osc, unsigned long
         int wp_cnt = 0;
         u32 pll1_rate;

+       turn_off_display(MX51_IPU_CTRL_BASE_ADDR + ((512 - 32) << 20));
         pll1_base = ioremap(PLL1_BASE_ADDR, SZ_4K);
         pll2_base = ioremap(PLL2_BASE_ADDR, SZ_4K);
         pll3_base = ioremap(PLL3_BASE_ADDR, SZ_4K);
@@ -4622,9 +4636,7 @@ int __init mx51_clocks_init(unsigned long ckil, 
unsigned long osc, unsigned long
         __raw_writel(0, MXC_CCM_CCGR3);
         __raw_writel(1 << MXC_CCM_CCGRx_CG8_OFFSET, MXC_CCM_CCGR4);

-       /* if ipu enabled, leave enabled, else sleep handshake will fail */
-       reg = __raw_readl(MXC_CCM_CCGR5) & (3 << MXC_CCM_CCGRx_CG5_OFFSET);
-       __raw_writel(reg | 1 << MXC_CCM_CCGRx_CG2_OFFSET |
+       __raw_writel(1 << MXC_CCM_CCGRx_CG2_OFFSET |
                      1 << MXC_CCM_CCGR5_CG6_1_OFFSET |
                      1 << MXC_CCM_CCGR5_CG6_2_OFFSET |
                      3 << MXC_CCM_CCGRx_CG7_OFFSET |
@@ -4910,6 +4922,8 @@ int __init mx53_clocks_init(unsigned long ckil, 
unsigned long osc, unsigned long
         int i = 0, j = 0, reg;
         u32 pll1_rate;

+       turn_off_display(MX53_IPU_CTRL_BASE_ADDR + ((128 - 32) << 20));
+
         pll1_base = ioremap(MX53_BASE_ADDR(PLL1_BASE_ADDR), SZ_4K);
         pll2_base = ioremap(MX53_BASE_ADDR(PLL2_BASE_ADDR), SZ_4K);
         pll3_base = ioremap(MX53_BASE_ADDR(PLL3_BASE_ADDR), SZ_4K);
@@ -4955,9 +4969,7 @@ int __init mx53_clocks_init(unsigned long ckil, 
unsigned long osc, unsigned long
         __raw_writel(0, MXC_CCM_CCGR3);
         __raw_writel(1 << MXC_CCM_CCGRx_CG8_OFFSET, MXC_CCM_CCGR4);

-       /* if ipu enabled, leave enabled, else sleep handshake will fail */
-       reg = __raw_readl(MXC_CCM_CCGR5) & (3 << MXC_CCM_CCGRx_CG5_OFFSET);
-       __raw_writel(reg | 1 << MXC_CCM_CCGRx_CG2_OFFSET |
+       __raw_writel(1 << MXC_CCM_CCGRx_CG2_OFFSET |
                      1 << MXC_CCM_CCGRx_CG6_OFFSET |
                      3 << MXC_CCM_CCGRx_CG7_OFFSET |
                      1 << MXC_CCM_CCGRx_CG8_OFFSET |