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[PATCH] ppc32: Fix a sleep issues on some laptops
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Some earlier models of aluminium powerbooks and ibook G4s have a clock chip
that requires some tweaking before and after sleep.  It seems that without
that magic incantation to disable and re-enable clock spreading, RAM isn't
properly refreshed during sleep.  This fixes it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Benjamin Herrenschmidt authored and Linus Torvalds committed May 1, 2005
1 parent 146a4b3 commit b20cc8a
Showing 1 changed file with 114 additions and 100 deletions.
214 changes: 114 additions & 100 deletions arch/ppc/platforms/pmac_feature.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1590,6 +1590,112 @@ intrepid_shutdown(struct macio_chip* macio, int sleep_mode)
mdelay(10);
}


static void __pmac pmac_tweak_clock_spreading(struct macio_chip* macio, int enable)
{
/* Hack for doing clock spreading on some machines PowerBooks and
* iBooks. This implements the "platform-do-clockspreading" OF
* property as decoded manually on various models. For safety, we also
* check the product ID in the device-tree in cases we'll whack the i2c
* chip to make reasonably sure we won't set wrong values in there
*
* Of course, ultimately, we have to implement a real parser for
* the platform-do-* stuff...
*/

if (macio->type == macio_intrepid) {
if (enable)
UN_OUT(UNI_N_CLOCK_SPREADING, 2);
else
UN_OUT(UNI_N_CLOCK_SPREADING, 0);
mdelay(40);
}

while (machine_is_compatible("PowerBook5,2") ||
machine_is_compatible("PowerBook5,3") ||
machine_is_compatible("PowerBook6,2") ||
machine_is_compatible("PowerBook6,3")) {
struct device_node *ui2c = of_find_node_by_type(NULL, "i2c");
struct device_node *dt = of_find_node_by_name(NULL, "device-tree");
u8 buffer[9];
u32 *productID;
int i, rc, changed = 0;

if (dt == NULL)
break;
productID = (u32 *)get_property(dt, "pid#", NULL);
if (productID == NULL)
break;
while(ui2c) {
struct device_node *p = of_get_parent(ui2c);
if (p && !strcmp(p->name, "uni-n"))
break;
ui2c = of_find_node_by_type(ui2c, "i2c");
}
if (ui2c == NULL)
break;
DBG("Trying to bump clock speed for PID: %08x...\n", *productID);
rc = pmac_low_i2c_open(ui2c, 1);
if (rc != 0)
break;
pmac_low_i2c_setmode(ui2c, pmac_low_i2c_mode_combined);
rc = pmac_low_i2c_xfer(ui2c, 0xd2 | pmac_low_i2c_read, 0x80, buffer, 9);
DBG("read result: %d,", rc);
if (rc != 0) {
pmac_low_i2c_close(ui2c);
break;
}
for (i=0; i<9; i++)
DBG(" %02x", buffer[i]);
DBG("\n");

switch(*productID) {
case 0x1182: /* AlBook 12" rev 2 */
case 0x1183: /* iBook G4 12" */
buffer[0] = (buffer[0] & 0x8f) | 0x70;
buffer[2] = (buffer[2] & 0x7f) | 0x00;
buffer[5] = (buffer[5] & 0x80) | 0x31;
buffer[6] = (buffer[6] & 0x40) | 0xb0;
buffer[7] = (buffer[7] & 0x00) | (enable ? 0xc0 : 0xba);
buffer[8] = (buffer[8] & 0x00) | 0x30;
changed = 1;
break;
case 0x3142: /* AlBook 15" (ATI M10) */
case 0x3143: /* AlBook 17" (ATI M10) */
buffer[0] = (buffer[0] & 0xaf) | 0x50;
buffer[2] = (buffer[2] & 0x7f) | 0x00;
buffer[5] = (buffer[5] & 0x80) | 0x31;
buffer[6] = (buffer[6] & 0x40) | 0xb0;
buffer[7] = (buffer[7] & 0x00) | (enable ? 0xd0 : 0xc0);
buffer[8] = (buffer[8] & 0x00) | 0x30;
changed = 1;
break;
default:
DBG("i2c-hwclock: Machine model not handled\n");
break;
}
if (!changed) {
pmac_low_i2c_close(ui2c);
break;
}
pmac_low_i2c_setmode(ui2c, pmac_low_i2c_mode_stdsub);
rc = pmac_low_i2c_xfer(ui2c, 0xd2 | pmac_low_i2c_write, 0x80, buffer, 9);
DBG("write result: %d,", rc);
pmac_low_i2c_setmode(ui2c, pmac_low_i2c_mode_combined);
rc = pmac_low_i2c_xfer(ui2c, 0xd2 | pmac_low_i2c_read, 0x80, buffer, 9);
DBG("read result: %d,", rc);
if (rc != 0) {
pmac_low_i2c_close(ui2c);
break;
}
for (i=0; i<9; i++)
DBG(" %02x", buffer[i]);
pmac_low_i2c_close(ui2c);
break;
}
}


static int __pmac
core99_sleep(void)
{
Expand All @@ -1601,11 +1707,8 @@ core99_sleep(void)
macio->type != macio_intrepid)
return -ENODEV;

/* The device-tree contains that in the hwclock node */
if (macio->type == macio_intrepid) {
UN_OUT(UNI_N_CLOCK_SPREADING, 0);
mdelay(40);
}
/* Disable clock spreading */
pmac_tweak_clock_spreading(macio, 0);

/* We power off the wireless slot in case it was not done
* by the driver. We don't power it on automatically however
Expand Down Expand Up @@ -1749,11 +1852,8 @@ core99_wake_up(void)
UN_OUT(UNI_N_CLOCK_CNTL, save_unin_clock_ctl);
udelay(100);

/* Restore clock spreading */
if (macio->type == macio_intrepid) {
UN_OUT(UNI_N_CLOCK_SPREADING, 2);
mdelay(40);
}
/* Enable clock spreading */
pmac_tweak_clock_spreading(macio, 1);

return 0;
}
Expand Down Expand Up @@ -2718,97 +2818,11 @@ set_initial_features(void)
MACIO_BIC(HEATHROW_FCR, HRW_SOUND_POWER_N);
}

/* Hack for bumping clock speed on the new PowerBooks and the
* iBook G4. This implements the "platform-do-clockspreading" OF
* property. For safety, we also check the product ID in the
* device-tree to make reasonably sure we won't set wrong values
* in the clock chip.
*
* Of course, ultimately, we have to implement a real parser for
* the platform-do-* stuff...
/* Some machine models need the clock chip to be properly setup for
* clock spreading now. This should be a platform function but we
* don't do these at the moment
*/
while (machine_is_compatible("PowerBook5,2") ||
machine_is_compatible("PowerBook5,3") ||
machine_is_compatible("PowerBook6,2") ||
machine_is_compatible("PowerBook6,3")) {
struct device_node *ui2c = of_find_node_by_type(NULL, "i2c");
struct device_node *dt = of_find_node_by_name(NULL, "device-tree");
u8 buffer[9];
u32 *productID;
int i, rc, changed = 0;

if (dt == NULL)
break;
productID = (u32 *)get_property(dt, "pid#", NULL);
if (productID == NULL)
break;
while(ui2c) {
struct device_node *p = of_get_parent(ui2c);
if (p && !strcmp(p->name, "uni-n"))
break;
ui2c = of_find_node_by_type(ui2c, "i2c");
}
if (ui2c == NULL)
break;
DBG("Trying to bump clock speed for PID: %08x...\n", *productID);
rc = pmac_low_i2c_open(ui2c, 1);
if (rc != 0)
break;
pmac_low_i2c_setmode(ui2c, pmac_low_i2c_mode_combined);
rc = pmac_low_i2c_xfer(ui2c, 0xd2 | pmac_low_i2c_read, 0x80, buffer, 9);
DBG("read result: %d,", rc);
if (rc != 0) {
pmac_low_i2c_close(ui2c);
break;
}
for (i=0; i<9; i++)
DBG(" %02x", buffer[i]);
DBG("\n");

switch(*productID) {
case 0x1182: /* AlBook 12" rev 2 */
case 0x1183: /* iBook G4 12" */
buffer[0] = (buffer[0] & 0x8f) | 0x70;
buffer[2] = (buffer[2] & 0x7f) | 0x00;
buffer[5] = (buffer[5] & 0x80) | 0x31;
buffer[6] = (buffer[6] & 0x40) | 0xb0;
buffer[7] = (buffer[7] & 0x00) | 0xc0;
buffer[8] = (buffer[8] & 0x00) | 0x30;
changed = 1;
break;
case 0x3142: /* AlBook 15" (ATI M10) */
case 0x3143: /* AlBook 17" (ATI M10) */
buffer[0] = (buffer[0] & 0xaf) | 0x50;
buffer[2] = (buffer[2] & 0x7f) | 0x00;
buffer[5] = (buffer[5] & 0x80) | 0x31;
buffer[6] = (buffer[6] & 0x40) | 0xb0;
buffer[7] = (buffer[7] & 0x00) | 0xd0;
buffer[8] = (buffer[8] & 0x00) | 0x30;
changed = 1;
break;
default:
DBG("i2c-hwclock: Machine model not handled\n");
break;
}
if (!changed) {
pmac_low_i2c_close(ui2c);
break;
}
pmac_low_i2c_setmode(ui2c, pmac_low_i2c_mode_stdsub);
rc = pmac_low_i2c_xfer(ui2c, 0xd2 | pmac_low_i2c_write, 0x80, buffer, 9);
DBG("write result: %d,", rc);
pmac_low_i2c_setmode(ui2c, pmac_low_i2c_mode_combined);
rc = pmac_low_i2c_xfer(ui2c, 0xd2 | pmac_low_i2c_read, 0x80, buffer, 9);
DBG("read result: %d,", rc);
if (rc != 0) {
pmac_low_i2c_close(ui2c);
break;
}
for (i=0; i<9; i++)
DBG(" %02x", buffer[i]);
pmac_low_i2c_close(ui2c);
break;
}
pmac_tweak_clock_spreading(&macio_chips[0], 1);

#endif /* CONFIG_POWER4 */

Expand Down

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