powerpc/tau: Check processor type before enabling TAU interrupt

[ Upstream commit 5e3119e ]

According to Freescale's documentation, MPC74XX processors have an
erratum that prevents the TAU interrupt from working, so don't try to
use it when running on those processors.

Fixes: 1da177e ("Linux-2.6.12-rc2")
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c281611544768e758bd58fe812cf702a5bd2d042.1599260540.git.fthain@telegraphics.com.au
Signed-off-by: Sasha Levin <sashal@kernel.org>

arch/powerpc/kernel/tau_6xx.c

@@ -40,6 +40,8 @@ static struct tau_temp
 	unsigned char grew;
 } tau[NR_CPUS];
 
+static bool tau_int_enable;
+
 #undef DEBUG
 
 /* TODO: put these in a /proc interface, with some sanity checks, and maybe
@@ -54,22 +56,13 @@ static struct tau_temp
 
 static void set_thresholds(unsigned long cpu)
 {
-#ifdef CONFIG_TAU_INT
-	/*
-	 * setup THRM1,
-	 * threshold, valid bit, enable interrupts, interrupt when below threshold
-	 */
-	mtspr(SPRN_THRM1, THRM1_THRES(tau[cpu].low) | THRM1_V | THRM1_TIE | THRM1_TID);
+	u32 maybe_tie = tau_int_enable ? THRM1_TIE : 0;
 
-	/* setup THRM2,
-	 * threshold, valid bit, enable interrupts, interrupt when above threshold
-	 */
-	mtspr (SPRN_THRM2, THRM1_THRES(tau[cpu].high) | THRM1_V | THRM1_TIE);
-#else
-	/* same thing but don't enable interrupts */
-	mtspr(SPRN_THRM1, THRM1_THRES(tau[cpu].low) | THRM1_V | THRM1_TID);
-	mtspr(SPRN_THRM2, THRM1_THRES(tau[cpu].high) | THRM1_V);
-#endif
+	/* setup THRM1, threshold, valid bit, interrupt when below threshold */
+	mtspr(SPRN_THRM1, THRM1_THRES(tau[cpu].low) | THRM1_V | maybe_tie | THRM1_TID);
+
+	/* setup THRM2, threshold, valid bit, interrupt when above threshold */
+	mtspr(SPRN_THRM2, THRM1_THRES(tau[cpu].high) | THRM1_V | maybe_tie);
 }
 
 static void TAUupdate(int cpu)
@@ -142,9 +135,8 @@ static void tau_timeout(void * info)
 	local_irq_save(flags);
 	cpu = smp_processor_id();
 
-#ifndef CONFIG_TAU_INT
-	TAUupdate(cpu);
-#endif
+	if (!tau_int_enable)
+		TAUupdate(cpu);
 
 	size = tau[cpu].high - tau[cpu].low;
 	if (size > min_window && ! tau[cpu].grew) {
@@ -225,6 +217,9 @@ static int __init TAU_init(void)
 		return 1;
 	}
 
+	tau_int_enable = IS_ENABLED(CONFIG_TAU_INT) &&
+			 !strcmp(cur_cpu_spec->platform, "ppc750");
+
 	tau_workq = alloc_workqueue("tau", WQ_UNBOUND, 1, 0);
 	if (!tau_workq)
 		return -ENOMEM;
@@ -234,7 +229,7 @@ static int __init TAU_init(void)
 	queue_work(tau_workq, &tau_work);
 
 	pr_info("Thermal assist unit using %s, shrink_timer: %d ms\n",
-		IS_ENABLED(CONFIG_TAU_INT) ? "interrupts" : "workqueue", shrink_timer);
+		tau_int_enable ? "interrupts" : "workqueue", shrink_timer);
 	tau_initialized = 1;
 
 	return 0;

arch/powerpc/platforms/Kconfig

@@ -219,9 +219,8 @@ config TAU
 	  temperature within 2-4 degrees Celsius. This option shows the current
 	  on-die temperature in /proc/cpuinfo if the cpu supports it.
 
-	  Unfortunately, on some chip revisions, this sensor is very inaccurate
-	  and in many cases, does not work at all, so don't assume the cpu
-	  temp is actually what /proc/cpuinfo says it is.
+	  Unfortunately, this sensor is very inaccurate when uncalibrated, so
+	  don't assume the cpu temp is actually what /proc/cpuinfo says it is.
 
 config TAU_INT
 	bool "Interrupt driven TAU driver (DANGEROUS)"