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111 lines
3.6 KiB
Diff
111 lines
3.6 KiB
Diff
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From 7af35792e1165cb9258e192ddfcb03393eb76f86 Mon Sep 17 00:00:00 2001
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From: Andy Green <andy@openmoko.com>
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Date: Fri, 25 Jul 2008 23:06:12 +0100
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Subject: [PATCH] fix-glamo-mci-relationship-with-pcf50633-suspend-resume.patch
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After protecting pcf50633 read and write primitives against
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operation after suspend or before resume (by blowing a
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stack_trace()) I saw glamo-mci was trying to use pcf50633
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at these bad times on its own suspend and resume. Since that
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part was already done via platform callback, I added an
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export in pcf50633 that tells you if it is ready or busy,
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and used it to defer (resume power on case) or ignore
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(suspend power off case, since pcf50633 already did it)
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the mci power call.
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Signed-off-by: Andy Green <andy@openmoko.com>
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---
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arch/arm/mach-s3c2440/mach-gta02.c | 17 ++++++++++-------
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drivers/i2c/chips/pcf50633.c | 14 ++++++++++++++
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include/linux/pcf50633.h | 5 +++++
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3 files changed, 29 insertions(+), 7 deletions(-)
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diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
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index 22de181..5980ea9 100644
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--- a/arch/arm/mach-s3c2440/mach-gta02.c
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+++ b/arch/arm/mach-s3c2440/mach-gta02.c
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@@ -1277,13 +1277,12 @@ gta02_glamo_mmc_set_power(unsigned char power_mode, unsigned short vdd)
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case GTA02v4_SYSTEM_REV:
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case GTA02v5_SYSTEM_REV:
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case GTA02v6_SYSTEM_REV:
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- /* depend on pcf50633 driver init */
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- if (!pcf50633_global)
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- while (!pcf50633_global)
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- msleep(10);
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switch (power_mode) {
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case MMC_POWER_ON:
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case MMC_POWER_UP:
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+ /* depend on pcf50633 driver init + not suspended */
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+ while (pcf50633_ready(pcf50633_global))
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+ msleep(1);
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/* select and set the voltage */
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if (vdd > 7) {
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mv += 300 + 100 * (vdd - 8);
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@@ -1292,15 +1291,19 @@ gta02_glamo_mmc_set_power(unsigned char power_mode, unsigned short vdd)
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}
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pcf50633_voltage_set(pcf50633_global,
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PCF50633_REGULATOR_HCLDO, mv);
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- msleep(10);
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pcf50633_onoff_set(pcf50633_global,
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PCF50633_REGULATOR_HCLDO, 1);
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- msleep(1);
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break;
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case MMC_POWER_OFF:
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+ /* power off happens during suspend, when pcf50633 can
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+ * be already gone and not coming back... just forget
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+ * the action then because pcf50633 suspend already
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+ * dealt with it, otherwise we spin forever
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+ */
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+ if (pcf50633_ready(pcf50633_global))
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+ return;
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pcf50633_onoff_set(pcf50633_global,
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PCF50633_REGULATOR_HCLDO, 0);
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- msleep(1);
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break;
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}
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break;
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diff --git a/drivers/i2c/chips/pcf50633.c b/drivers/i2c/chips/pcf50633.c
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index c148ea7..82ee2f0 100644
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--- a/drivers/i2c/chips/pcf50633.c
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+++ b/drivers/i2c/chips/pcf50633.c
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@@ -2230,6 +2230,20 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
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return 0;
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}
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+
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+int pcf50633_ready(struct pcf50633_data *pcf)
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+{
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+ if (!pcf)
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+ return -EBUSY;
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+
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+ if (pcf->have_been_suspended)
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+ return -EBUSY;
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL_GPL(pcf50633_ready);
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+
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+
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/*
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* if backlight resume is selected to be deferred by platform, then it
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* can call this to finally reset backlight status (after LCM is resumed
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diff --git a/include/linux/pcf50633.h b/include/linux/pcf50633.h
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index 8a75b28..0522d92 100644
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--- a/include/linux/pcf50633.h
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+++ b/include/linux/pcf50633.h
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@@ -129,6 +129,11 @@ extern void
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pcf50633_register_resume_dependency(struct pcf50633_data *pcf,
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struct resume_dependency *dep);
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+/* 0 = initialized and resumed and ready to roll, !=0 = either not
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+ * initialized or not resumed yet
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+ */
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+extern int
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+pcf50633_ready(struct pcf50633_data *pcf);
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#define PCF50633_FEAT_EXTON 0x00000001 /* not yet supported */
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#define PCF50633_FEAT_MBC 0x00000002
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--
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1.5.6.3
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