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arm: msm: smd: fix SMD modem processor sync condition

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When booting up we need to wait for the modem processor to
partially boot. This is because the modem processor does
resource allocation for us. If we don't wait the modem won't
honor our requests and we end up crashing or in an unknown
state. This change just formalizes the waiting process.

Signed-off-by: Daniel Walker <c_dwalke@quicinc.com>
This commit is contained in:
Daniel Walker 2010-03-18 12:31:08 -07:00 committed by Daniel Walker
parent b13525c263
commit 0aec66d493
3 changed files with 24 additions and 1 deletions
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15
arch/arm/mach-msm/proc_comm.c
View File

@ -114,4 +114,17 @@ int msm_proc_comm(unsigned cmd, unsigned *data1, unsigned *data2)
return ret;
}
/*
* We need to wait for the ARM9 to at least partially boot
* up before we can continue. Since the ARM9 does resource
* allocation, if we dont' wait we could end up crashing or in
* and unknown state. This function should be called early to
* wait on the ARM9.
*/
void __init proc_comm_boot_wait(void)
{
void __iomem *base = MSM_SHARED_RAM_BASE;
proc_comm_wait_for(base + MDM_STATUS, PCOM_READY);
}

3
arch/arm/mach-msm/proc_comm.h
View File

@ -16,6 +16,8 @@
#ifndef _ARCH_ARM_MACH_MSM_PROC_COMM_H_
#define _ARCH_ARM_MACH_MSM_PROC_COMM_H_
#include <linux/init.h>
enum {
PCOM_CMD_IDLE = 0x0,
PCOM_CMD_DONE,
@ -251,5 +253,6 @@ enum {
(((drvstr) & 0xF) << 17))
int msm_proc_comm(unsigned cmd, unsigned *data1, unsigned *data2);
void __init proc_comm_boot_wait(void);
#endif

7
arch/arm/mach-msm/smd.c
View File

@ -1001,6 +1001,13 @@ static int __init msm_smd_probe(struct platform_device *pdev)
{
pr_info("smd_init()\n");
/*
* If we haven't waited for the ARM9 to boot up till now,
* then we need to wait here. Otherwise this should just
* return immediately.
*/
proc_comm_boot_wait();
INIT_WORK(&probe_work, smd_channel_probe_worker);
if (smd_core_init()) {