Merge tag 'v4.17-rc4' into patchwork

Linux 4.17-rc4

* tag 'v4.17-rc4': (920 commits)
  Linux 4.17-rc4
  KVM: x86: remove APIC Timer periodic/oneshot spikes
  genksyms: fix typo in parse.tab.{c,h} generation rules
  kbuild: replace hardcoded bison in cmd_bison_h with $(YACC)
  gcc-plugins: fix build condition of SANCOV plugin
  MAINTAINERS: Update Kbuild entry with a few paths
  Revert "usb: host: ehci: Use dma_pool_zalloc()"
  platform/x86: Kconfig: Fix dell-laptop dependency chain.
  platform/x86: asus-wireless: Fix NULL pointer dereference
  arm64: vgic-v2: Fix proxying of cpuif access
  KVM: arm/arm64: vgic_init: Cleanup reference to process_maintenance
  KVM: arm64: Fix order of vcpu_write_sys_reg() arguments
  MAINTAINERS & files: Canonize the e-mails I use at files
  media: imx-media-csi: Fix inconsistent IS_ERR and PTR_ERR
  tools: power/acpi, revert to LD = gcc
  bdi: Fix oops in wb_workfn()
  RDMA/cma: Do not query GID during QP state transition to RTR
  IB/mlx4: Fix integer overflow when calculating optimal MTT size
  IB/hfi1: Fix memory leak in exception path in get_irq_affinity()
  IB/{hfi1, rdmavt}: Fix memory leak in hfi1_alloc_devdata() upon failure
  ...

1 files changed, 34 insertions, 11 deletions

diff --git a/drivers/clocksource/timer-imx-tpm.c b/drivers/clocksource/timer-imx-tpm.c
index 21bffdcb2f202..6c8318470b487 100644
--- a/drivers/clocksource/timer-imx-tpm.c
+++ b/drivers/clocksource/timer-imx-tpm.c
@@ -17,9 +17,14 @@
 #include <linux/of_irq.h>
 #include <linux/sched_clock.h>
 
+#define TPM_PARAM			0x4
+#define TPM_PARAM_WIDTH_SHIFT		16
+#define TPM_PARAM_WIDTH_MASK		(0xff << 16)
 #define TPM_SC				0x10
 #define TPM_SC_CMOD_INC_PER_CNT		(0x1 << 3)
 #define TPM_SC_CMOD_DIV_DEFAULT		0x3
+#define TPM_SC_CMOD_DIV_MAX		0x7
+#define TPM_SC_TOF_MASK			(0x1 << 7)
 #define TPM_CNT				0x14
 #define TPM_MOD				0x18
 #define TPM_STATUS			0x1c
@@ -29,8 +34,11 @@
 #define TPM_C0SC_MODE_SHIFT		2
 #define TPM_C0SC_MODE_MASK		0x3c
 #define TPM_C0SC_MODE_SW_COMPARE	0x4
+#define TPM_C0SC_CHF_MASK		(0x1 << 7)
 #define TPM_C0V				0x24
 
+static int counter_width;
+static int rating;
 static void __iomem *timer_base;
 static struct clock_event_device clockevent_tpm;
 
@@ -83,10 +91,11 @@ static int __init tpm_clocksource_init(unsigned long rate)
 	tpm_delay_timer.freq = rate;
 	register_current_timer_delay(&tpm_delay_timer);
 
-	sched_clock_register(tpm_read_sched_clock, 32, rate);
+	sched_clock_register(tpm_read_sched_clock, counter_width, rate);
 
 	return clocksource_mmio_init(timer_base + TPM_CNT, "imx-tpm",
-				     rate, 200, 32, clocksource_mmio_readl_up);
+				     rate, rating, counter_width,
+				     clocksource_mmio_readl_up);
 }
 
 static int tpm_set_next_event(unsigned long delta,
@@ -105,7 +114,7 @@ static int tpm_set_next_event(unsigned long delta,
 	 * of writing CNT registers which may cause the min_delta event got
 	 * missed, so we need add a ETIME check here in case it happened.
 	 */
-	return (int)((next - now) <= 0) ? -ETIME : 0;
+	return (int)(next - now) <= 0 ? -ETIME : 0;
 }
 
 static int tpm_set_state_oneshot(struct clock_event_device *evt)
@@ -139,7 +148,6 @@ static struct clock_event_device clockevent_tpm = {
 	.set_state_oneshot	= tpm_set_state_oneshot,
 	.set_next_event		= tpm_set_next_event,
 	.set_state_shutdown	= tpm_set_state_shutdown,
-	.rating			= 200,
 };
 
 static int __init tpm_clockevent_init(unsigned long rate, int irq)
@@ -149,10 +157,11 @@ static int __init tpm_clockevent_init(unsigned long rate, int irq)
 	ret = request_irq(irq, tpm_timer_interrupt, IRQF_TIMER | IRQF_IRQPOLL,
 			  "i.MX7ULP TPM Timer", &clockevent_tpm);
 
+	clockevent_tpm.rating = rating;
 	clockevent_tpm.cpumask = cpumask_of(0);
 	clockevent_tpm.irq = irq;
-	clockevents_config_and_register(&clockevent_tpm,
-					rate, 300, 0xfffffffe);
+	clockevents_config_and_register(&clockevent_tpm, rate, 300,
+					GENMASK(counter_width - 1, 1));
 
 	return ret;
 }
@@ -179,7 +188,7 @@ static int __init tpm_timer_init(struct device_node *np)
 	ipg = of_clk_get_by_name(np, "ipg");
 	per = of_clk_get_by_name(np, "per");
 	if (IS_ERR(ipg) || IS_ERR(per)) {
-		pr_err("tpm: failed to get igp or per clk\n");
+		pr_err("tpm: failed to get ipg or per clk\n");
 		ret = -ENODEV;
 		goto err_clk_get;
 	}
@@ -197,6 +206,11 @@ static int __init tpm_timer_init(struct device_node *np)
 		goto err_per_clk_enable;
 	}
 
+	counter_width = (readl(timer_base + TPM_PARAM) & TPM_PARAM_WIDTH_MASK)
+		>> TPM_PARAM_WIDTH_SHIFT;
+	/* use rating 200 for 32-bit counter and 150 for 16-bit counter */
+	rating = counter_width == 0x20 ? 200 : 150;
+
 	/*
 	 * Initialize tpm module to a known state
 	 * 1) Counter disabled
@@ -205,16 +219,25 @@ static int __init tpm_timer_init(struct device_node *np)
 	 * 4) Channel0 disabled
 	 * 5) DMA transfers disabled
 	 */
+	/* make sure counter is disabled */
 	writel(0, timer_base + TPM_SC);
+	/* TOF is W1C */
+	writel(TPM_SC_TOF_MASK, timer_base + TPM_SC);
 	writel(0, timer_base + TPM_CNT);
-	writel(0, timer_base + TPM_C0SC);
+	/* CHF is W1C */
+	writel(TPM_C0SC_CHF_MASK, timer_base + TPM_C0SC);
 
-	/* increase per cnt, div 8 by default */
-	writel(TPM_SC_CMOD_INC_PER_CNT | TPM_SC_CMOD_DIV_DEFAULT,
+	/*
+	 * increase per cnt,
+	 * div 8 for 32-bit counter and div 128 for 16-bit counter
+	 */
+	writel(TPM_SC_CMOD_INC_PER_CNT |
+		(counter_width == 0x20 ?
+		TPM_SC_CMOD_DIV_DEFAULT : TPM_SC_CMOD_DIV_MAX),
 		     timer_base + TPM_SC);
 
 	/* set MOD register to maximum for free running mode */
-	writel(0xffffffff, timer_base + TPM_MOD);
+	writel(GENMASK(counter_width - 1, 0), timer_base + TPM_MOD);
 
 	rate = clk_get_rate(per) >> 3;
 	ret = tpm_clocksource_init(rate);