brcmfmac: check and dump trap info during sdio probe

When the firmware crashes during the probe sequence we provide little
information on what really failed. This patch checks the sdpcm shared
location and show the trap information if a firmware trap has happened.
Reviewed-by: Hante Meuleman <hante.meuleman@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>
Reviewed-by: Franky Lin <franky.lin@broadcom.com>
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c

@@ -2999,21 +2999,35 @@ static int brcmf_sdio_trap_info(struct seq_file *seq, struct brcmf_sdio *bus,
 	if (error < 0)
 		return error;
 
-	seq_printf(seq,
-		   "dongle trap info: type 0x%x @ epc 0x%08x\n"
-		   "  cpsr 0x%08x spsr 0x%08x sp 0x%08x\n"
-		   "  lr   0x%08x pc   0x%08x offset 0x%x\n"
-		   "  r0   0x%08x r1   0x%08x r2 0x%08x r3 0x%08x\n"
-		   "  r4   0x%08x r5   0x%08x r6 0x%08x r7 0x%08x\n",
-		   le32_to_cpu(tr.type), le32_to_cpu(tr.epc),
-		   le32_to_cpu(tr.cpsr), le32_to_cpu(tr.spsr),
-		   le32_to_cpu(tr.r13), le32_to_cpu(tr.r14),
-		   le32_to_cpu(tr.pc), sh->trap_addr,
-		   le32_to_cpu(tr.r0), le32_to_cpu(tr.r1),
-		   le32_to_cpu(tr.r2), le32_to_cpu(tr.r3),
-		   le32_to_cpu(tr.r4), le32_to_cpu(tr.r5),
-		   le32_to_cpu(tr.r6), le32_to_cpu(tr.r7));
-
+	if (seq)
+		seq_printf(seq,
+			   "dongle trap info: type 0x%x @ epc 0x%08x\n"
+			   "  cpsr 0x%08x spsr 0x%08x sp 0x%08x\n"
+			   "  lr   0x%08x pc   0x%08x offset 0x%x\n"
+			   "  r0   0x%08x r1   0x%08x r2 0x%08x r3 0x%08x\n"
+			   "  r4   0x%08x r5   0x%08x r6 0x%08x r7 0x%08x\n",
+			   le32_to_cpu(tr.type), le32_to_cpu(tr.epc),
+			   le32_to_cpu(tr.cpsr), le32_to_cpu(tr.spsr),
+			   le32_to_cpu(tr.r13), le32_to_cpu(tr.r14),
+			   le32_to_cpu(tr.pc), sh->trap_addr,
+			   le32_to_cpu(tr.r0), le32_to_cpu(tr.r1),
+			   le32_to_cpu(tr.r2), le32_to_cpu(tr.r3),
+			   le32_to_cpu(tr.r4), le32_to_cpu(tr.r5),
+			   le32_to_cpu(tr.r6), le32_to_cpu(tr.r7));
+	else
+		pr_debug("dongle trap info: type 0x%x @ epc 0x%08x\n"
+			 "  cpsr 0x%08x spsr 0x%08x sp 0x%08x\n"
+			 "  lr   0x%08x pc   0x%08x offset 0x%x\n"
+			 "  r0   0x%08x r1   0x%08x r2 0x%08x r3 0x%08x\n"
+			 "  r4   0x%08x r5   0x%08x r6 0x%08x r7 0x%08x\n",
+			 le32_to_cpu(tr.type), le32_to_cpu(tr.epc),
+			 le32_to_cpu(tr.cpsr), le32_to_cpu(tr.spsr),
+			 le32_to_cpu(tr.r13), le32_to_cpu(tr.r14),
+			 le32_to_cpu(tr.pc), sh->trap_addr,
+			 le32_to_cpu(tr.r0), le32_to_cpu(tr.r1),
+			 le32_to_cpu(tr.r2), le32_to_cpu(tr.r3),
+			 le32_to_cpu(tr.r4), le32_to_cpu(tr.r5),
+			 le32_to_cpu(tr.r6), le32_to_cpu(tr.r7));
 	return 0;
 }
 
@@ -3067,8 +3081,10 @@ static int brcmf_sdio_checkdied(struct brcmf_sdio *bus)
 	else if (sh.flags & SDPCM_SHARED_ASSERT)
 		brcmf_err("assertion in dongle\n");
 
-	if (sh.flags & SDPCM_SHARED_TRAP)
+	if (sh.flags & SDPCM_SHARED_TRAP) {
 		brcmf_err("firmware trap in dongle\n");
+		brcmf_sdio_trap_info(NULL, bus, &sh);
+	}
 
 	return 0;
 }
@@ -4199,7 +4215,7 @@ static void brcmf_sdio_firmware_callback(struct device *dev, int err,
 	} else {
 		/* Disable F2 again */
 		sdio_disable_func(sdiod->func2);
-		goto release;
+		goto checkdied;
 	}
 
 	if (brcmf_chip_sr_capable(bus->ci)) {
@@ -4220,8 +4236,10 @@ static void brcmf_sdio_firmware_callback(struct device *dev, int err,
 	}
 
 	/* If we didn't come up, turn off backplane clock */
-	if (err != 0)
+	if (err != 0) {
 		brcmf_sdio_clkctl(bus, CLK_NONE, false);
+		goto checkdied;
+	}
 
 	sdio_release_host(sdiod->func1);
 
@@ -4235,12 +4253,15 @@ static void brcmf_sdio_firmware_callback(struct device *dev, int err,
 	err = brcmf_attach(sdiod->dev, sdiod->settings);
 	if (err != 0) {
 		brcmf_err("brcmf_attach failed\n");
-		goto fail;
+		sdio_claim_host(sdiod->func1);
+		goto checkdied;
 	}
 
 	/* ready */
 	return;
 
+checkdied:
+	brcmf_sdio_checkdied(bus);
 release:
 	sdio_release_host(sdiod->func1);
 fail: