linux-kernel - RE: [Regression 5.6-rc1][Bisected b6231ea2b3c6] Powerpc 8xx doesn't boot anymore

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Date:   Thu, 13 Feb 2020 03:35:25 +0000
From:   Qiang Zhao <qiang.zhao@....com>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Leo Li <leoyang.li@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Scott Wood <oss@...error.net>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [Regression 5.6-rc1][Bisected b6231ea2b3c6] Powerpc 8xx doesn't
 boot anymore

On 02/12/2020 22:50 PM, Christophe Leroy wrote:
> -----Original Message-----
> From: Christophe Leroy <christophe.leroy@....fr>
> Sent: 2020年2月12日 22:50
> To: Rasmus Villemoes <linux@...musvillemoes.dk>; Leo Li
> <leoyang.li@....com>; Qiang Zhao <qiang.zhao@....com>; Greg
> Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Scott Wood <oss@...error.net>; linuxppc-dev@...ts.ozlabs.org; LKML
> <linux-kernel@...r.kernel.org>; linux-arm-kernel@...ts.infradead.org
> Subject: Re: [Regression 5.6-rc1][Bisected b6231ea2b3c6] Powerpc 8xx doesn't
> boot anymore
> 
> ---
> diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
> b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
> index 4cabded8390b..341d682ec6eb 100644
> --- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
> +++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
> @@ -1351,6 +1351,7 @@ static int __init cpm_uart_console_setup(struct
> console *co, char *options)
>   		clrbits32(&pinfo->sccp->scc_gsmrl, SCC_GSMRL_ENR |
> SCC_GSMRL_ENT);
>   	}
> 
> +	cpm_muram_init();
>   	ret = cpm_uart_allocbuf(pinfo, 1);
> 
>   	if (ret)
> 
How about the patch like below? Just a draft.

diff --git a/drivers/soc/fsl/qe/qe.c b/drivers/soc/fsl/qe/qe.c
index 96c2057..c5c2464 100644
--- a/drivers/soc/fsl/qe/qe.c
+++ b/drivers/soc/fsl/qe/qe.c
@@ -29,6 +29,8 @@
 #include <soc/fsl/qe/immap_qe.h>
 #include <soc/fsl/qe/qe.h>

+static int qe_inited;
+
 static void qe_snums_init(void);
 static int qe_sdma_init(void);

@@ -637,15 +639,19 @@ unsigned int qe_get_num_of_snums(void)
 }
 EXPORT_SYMBOL(qe_get_num_of_snums);

-static int __init qe_init(void)
+int __init qe_init(void)
 {
        struct device_node *np;

+       if(qe_inited)
+               return 0;
+
        np = of_find_compatible_node(NULL, NULL, "fsl,qe");
        if (!np)
                return -ENODEV;
        qe_reset();
        of_node_put(np);
+       qe_inited = 1
        return 0;
 }
 subsys_initcall(qe_init);
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
index 19d5a4c..cbf2c32 100644
--- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
@@ -1373,6 +1373,7 @@ static struct console cpm_scc_uart_console = {

 static int __init cpm_uart_console_init(void)
 {
+       qe_init();
        register_console(&cpm_scc_uart_console);
        return 0;
 }
diff --git a/include/soc/fsl/qe/qe.h b/include/soc/fsl/qe/qe.h
index e282ac0..531ba05 100644
--- a/include/soc/fsl/qe/qe.h
+++ b/include/soc/fsl/qe/qe.h
@@ -88,6 +88,7 @@ static inline bool qe_clock_is_brg(enum qe_clock clk)

 extern spinlock_t cmxgcr_lock;

+int __init  qe_init(void);
 /* Export QE common operations */
 #ifdef CONFIG_QUICC_ENGINE
 extern void qe_reset(void);

Best Regards
Qiang Zhao