Commit-ID: f43ea76cf310c3be95cb75ae1350cbe76a8f2380
Gitweb: http://git.kernel.org/tip/f43ea76cf310c3be95cb75ae1350cbe76a8f2380
Author: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
AuthorDate: Thu, 8 Sep 2016 13:32:32 +0300
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 8 Sep 2016 14:07:54 +0200
x86/platform/intel-mid: Keep SRAM powered on at boot
On Penwell SRAM has to be powered on, otherwise it prevents booting.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Fixes: ca22312dc840 ("x86/platform/intel-mid: Extend PWRMU to support Penwell")
Link: http://lkml.kernel.org/r/20160908103232.137587-2-andriy.shevchenko@xxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/platform/intel-mid/pwr.c | 45 +++++++++++++++++++++++++++++++--------
1 file changed, 36 insertions(+), 9 deletions(-)
diff --git a/arch/x86/platform/intel-mid/pwr.c b/arch/x86/platform/intel-mid/pwr.c
index 146ed54..5d3b45a 100644
--- a/arch/x86/platform/intel-mid/pwr.c
+++ b/arch/x86/platform/intel-mid/pwr.c
@@ -380,7 +380,7 @@ static int mid_pwr_probe(struct pci_dev *pdev, const struct pci_device_id *id)
return 0;
}
-static int mid_set_initial_state(struct mid_pwr *pwr)
+static int mid_set_initial_state(struct mid_pwr *pwr, const u32 *states)
{
unsigned int i, j;
int ret;
@@ -405,10 +405,10 @@ static int mid_set_initial_state(struct mid_pwr *pwr)
* NOTE: The actual device mapping is provided by a platform at run
* time using vendor capability of PCI configuration space.
*/
- mid_pwr_set_state(pwr, 0, 0xffffffff);
- mid_pwr_set_state(pwr, 1, 0xffffffff);
- mid_pwr_set_state(pwr, 2, 0xffffffff);
- mid_pwr_set_state(pwr, 3, 0xffffffff);
+ mid_pwr_set_state(pwr, 0, states[0]);
+ mid_pwr_set_state(pwr, 1, states[1]);
+ mid_pwr_set_state(pwr, 2, states[2]);
+ mid_pwr_set_state(pwr, 3, states[3]);
/* Send command to SCU */
ret = mid_pwr_wait_for_cmd(pwr, CMD_SET_CFG);
@@ -423,14 +423,41 @@ static int mid_set_initial_state(struct mid_pwr *pwr)
return 0;
}
-static const struct mid_pwr_device_info mid_info = {
- .set_initial_state = mid_set_initial_state,
+static int pnw_set_initial_state(struct mid_pwr *pwr)
+{
+ /* On Penwell SRAM must stay powered on */
+ const u32 states[] = {
+ 0xf00fffff, /* PM_SSC(0) */
+ 0xffffffff, /* PM_SSC(1) */
+ 0xffffffff, /* PM_SSC(2) */
+ 0xffffffff, /* PM_SSC(3) */
+ };
+ return mid_set_initial_state(pwr, states);
+}
+
+static int tng_set_initial_state(struct mid_pwr *pwr)
+{
+ const u32 states[] = {
+ 0xffffffff, /* PM_SSC(0) */
+ 0xffffffff, /* PM_SSC(1) */
+ 0xffffffff, /* PM_SSC(2) */
+ 0xffffffff, /* PM_SSC(3) */
+ };
+ return mid_set_initial_state(pwr, states);
+}
+
+static const struct mid_pwr_device_info pnw_info = {
+ .set_initial_state = pnw_set_initial_state,
+};
+
+static const struct mid_pwr_device_info tng_info = {
+ .set_initial_state = tng_set_initial_state,
};
/* This table should be in sync with the one in drivers/pci/pci-mid.c */
static const struct pci_device_id mid_pwr_pci_ids[] = {
- { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_PENWELL), (kernel_ulong_t)&mid_info },
- { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_TANGIER), (kernel_ulong_t)&mid_info },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_PENWELL), (kernel_ulong_t)&pnw_info },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_TANGIER), (kernel_ulong_t)&tng_info },
{}
};
--
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