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Subject[PATCH v2 2/4] platform/x86: intel_pmc_core: fix: Make pmc_core_lpm_display() generic for platforms that support sub-states
Date
Currently pmc_core_lpm_display() uses array of struct pointers i.e.,
tgl_lpm_maps for Tiger Lake directly to iterate through and to get the
number of status/live status registers which is hardcoded and cannot
be re-used for future platforms that support sub-states. To maintain
readability, make pmc_core_lpm_display() generic, so that it can re-used
for future platforms.

Cc: Chen Zhou <chenzhou10@huawei.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: David E. Box <david.e.box@intel.com>
Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Gayatri Kammela <gayatri.kammela@intel.com>
---
drivers/platform/x86/intel_pmc_core.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
index 20b2f49726cf..3f000b6c8d8e 100644
--- a/drivers/platform/x86/intel_pmc_core.c
+++ b/drivers/platform/x86/intel_pmc_core.c
@@ -20,6 +20,7 @@
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
+#include <linux/slab.h>
#include <linux/suspend.h>
#include <linux/uaccess.h>

@@ -639,15 +640,27 @@ static void pmc_core_slps0_display(struct pmc_dev *pmcdev, struct device *dev,
}
}

+static int pmc_core_lpm_get_arr_size(const struct pmc_bit_map **maps)
+{
+ int idx, arr_size = 0;
+
+ for (idx = 0; maps[idx]; idx++)
+ arr_size++;
+
+ return arr_size;
+}
+
static void pmc_core_lpm_display(struct pmc_dev *pmcdev, struct device *dev,
struct seq_file *s, u32 offset,
const char *str,
const struct pmc_bit_map **maps)
{
- u32 lpm_regs[ARRAY_SIZE(tgl_lpm_maps)-1];
- int index, idx, len = 32, bit_mask;
+ int arr_size = pmc_core_lpm_get_arr_size(maps);
+ int index, idx, bit_mask, len = 32;
+ u32 *lpm_regs;

- for (index = 0; tgl_lpm_maps[index]; index++) {
+ lpm_regs = kmalloc_array(arr_size, sizeof(*lpm_regs), GFP_KERNEL);
+ for (index = 0; maps[index]; index++) {
lpm_regs[index] = pmc_core_reg_read(pmcdev, offset);
offset += 4;
}
--
2.17.1
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