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Message-ID: <1cbb3bf5-fd70-e9db-2405-640178862857@broadcom.com>
Date:   Thu, 24 Nov 2022 10:42:38 +0100
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Subject: Re: AP6275 / bcm43752 pcie on mainline brcmf
To:     Andy Green <andy@warmcat.com>, Shengyu Qu <wiagn233@outlook.com>
Cc:     franky.lin@broadcom.com, linux-wireless@vger.kernel.org
References: <TY3P286MB26114DD461F50814980453E598029@TY3P286MB2611.JPNP286.PROD.OUTLOOK.COM>
 <08416710-655a-c87c-a599-3fe2563f7de4@warmcat.com>
 <18470a1e910.279b.9b12b7fc0a3841636cfb5e919b41b954@broadcom.com>
 <TY3P286MB26115A58795F264893CCB40198029@TY3P286MB2611.JPNP286.PROD.OUTLOOK.COM>
 <184720fc920.279b.9b12b7fc0a3841636cfb5e919b41b954@broadcom.com>
 <TY3P286MB26118BD94839F752CADCCF5298079@TY3P286MB2611.JPNP286.PROD.OUTLOOK.COM>
 <625f1d5d-e137-7ad7-96b9-92035e87df8b@broadcom.com>
 <638afa8e-a393-410c-3182-0d8e9b6da17d@warmcat.com>
 <1848793db88.279b.9b12b7fc0a3841636cfb5e919b41b954@broadcom.com>
 <3a562a50-0cef-4879-3691-3258596f5213@warmcat.com>
From:   Arend van Spriel <arend.vanspriel@broadcom.com>
In-Reply-To: <3a562a50-0cef-4879-3691-3258596f5213@warmcat.com>
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On 11/18/2022 6:41 AM, Andy Green wrote:
> 
> 
> On 11/17/22 21:52, Arend Van Spriel wrote:
> 
>> I see. So could you load bcmdhd and provide log. Preferably with 
>> higher debug level. It also has a module parameter for it. I think it 
>> is called dhd_msg_level and please set it to 0x817.
> 
> It's here:
> 
> https://warmcat.com/ap6275p-dhd-log1.txt

Hi Andy,

Thanks for the log. Together with the dhd driver sources I could make 
some sense of it. Perhaps you can try the following hack and see if we 
make it over the first hurdle.

Regards,
Arend
---
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c 
b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
index 97f0f13dfe50..ba436d71a7ec 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
@@ -11,6 +11,7 @@
  #include <linux/delay.h>
  #include <linux/interrupt.h>
  #include <linux/bcma/bcma.h>
+#include <linux/random.h>
  #include <linux/sched.h>
  #include <linux/io.h>
  #include <asm/unaligned.h>
@@ -1527,6 +1528,33 @@ brcmf_pcie_init_share_ram_info(struct 
brcmf_pciedev_info *devinfo,
  	return 0;
  }

+#define BRCMF_SEED_SIGNATURE		0xFEEDC0DE
+#define BRCMF_ENTROPY_HOST_SEED_LEN	128
+
+struct brcmf_entropy_metadata {
+	__le32 count;
+	__le32 signature;
+};
+
+static void brcmf_pcie_write_entropy_bytes(struct brcmf_pciedev_info 
*devinfo,
+					   u32 nvram_len)
+{
+	struct brcmf_entropy_metadata entropy_info;
+	u8 seed[BRCMF_ENTROPY_HOST_SEED_LEN] = { 0 };
+	u32 count = sizeof(seed);
+	u32 addr = devinfo->ci->rambase + devinfo->ci->ramsize - nvram_len;
+
+	entropy_info.signture = cpu_to_le32(BRCMF_SEED_SIGNATURE);
+	entropy_info.count = cpu_to_le32(BRCMF_ENTROPY_HOST_SEED_LEN);
+
+	addr -= sizeof(entropy_info);
+	memcpy_toio(devinfo->tcm + addr, &entropy_info, sizeof(entropy_info));
+
+	get_random_bytes(seed, count);
+
+	addr -= sizeof(count);
+	memcpy_toio(devinfo->tcm + addr, seed, count);
+}

  static int brcmf_pcie_download_fw_nvram(struct brcmf_pciedev_info 
*devinfo,
  					const struct firmware *fw, void *nvram,
@@ -1568,6 +1596,8 @@ static int brcmf_pcie_download_fw_nvram(struct 
brcmf_pciedev_info *devinfo,
  			  devinfo->nvram_name);
  	}

+	brcmf_pcie_write_entropy_bytes(devinfo, nvram_len);
+
  	sharedram_addr_written = brcmf_pcie_read_ram32(devinfo,
  						       devinfo->ci->ramsize -
  						       4);

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