linux-kernel - [PATCH v1 1/4] platform/x86: intel_pmc_core: fix: Make pmc_core_lpm_display() generic for platforms that support sub-states

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Date:   Wed, 26 Feb 2020 18:43:27 -0800
From:   Gayatri Kammela <gayatri.kammela@...el.com>
To:     platform-driver-x86@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, vishwanath.somayaji@...el.com,
        dvhart@...radead.org, mika.westerberg@...el.com,
        peterz@...radead.org, charles.d.prestopine@...el.com,
        Gayatri Kammela <gayatri.kammela@...el.com>,
        Chen Zhou <chenzhou10@...wei.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "David E . Box" <david.e.box@...el.com>
Subject: [PATCH v1 1/4] platform/x86: intel_pmc_core: fix: Make pmc_core_lpm_display() generic for platforms that support sub-states

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 will not
work 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@...wei.com>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: David E. Box <david.e.box@...el.com>
Suggested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Gayatri Kammela <gayatri.kammela@...el.com>
---
 drivers/platform/x86/intel_pmc_core.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
index f4a36fbabf4c..333c6963d270 100644
--- a/drivers/platform/x86/intel_pmc_core.c
+++ b/drivers/platform/x86/intel_pmc_core.c
@@ -979,10 +979,14 @@ static void pmc_core_lpm_display(struct pmc_dev *pmcdev, struct device *dev,
 				 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 index, idx, len = 32, bit_mask, arr_size = 0;
 
-	for (index = 0; tgl_lpm_maps[index]; index++) {
+	for (index = 0; maps[index]; index++)
+		arr_size++;
+
+	u32 lpm_regs[arr_size];
+
+	for (index = 0; maps[index]; index++) {
 		lpm_regs[index] = pmc_core_reg_read(pmcdev, offset);
 		offset += 4;
 	}
-- 
2.17.1