mwlwifi: fix excessive use of busy-waiting that was tripping up the flash driver

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/kernel/mwlwifi/patches/200-fix_excessive_delays.patch

@@ -0,0 +1,73 @@
+--- a/fwcmd.c
++++ b/fwcmd.c
+@@ -132,7 +132,7 @@ static int mwl_fwcmd_wait_complete(struc
+ 			int_code = le16_to_cpu(*((__le16 *)&priv->pcmd_buf[2]));
+ 		else
+ 			int_code = le16_to_cpu(*((__le16 *)&priv->pcmd_buf[0]));
+-		mdelay(1);
++		usleep_range(1000, 2000);
+ 	} while ((int_code != cmd) && (--curr_iteration));
+ 
+ 	if (curr_iteration == 0) {
+@@ -142,7 +142,7 @@ static int mwl_fwcmd_wait_complete(struc
+ 		return -EIO;
+ 	}
+ 
+-	mdelay(3);
++	usleep_range(3000, 5000);
+ 
+ 	return 0;
+ }
+--- a/fwdl.c
++++ b/fwdl.c
+@@ -74,7 +74,7 @@ int mwl_fwdl_download_firmware(struct ie
+ 	/* FW before jumping to boot rom, it will enable PCIe transaction retry,
+ 	 * wait for boot code to stop it.
+ 	 */
+-	mdelay(FW_CHECK_MSECS);
++	usleep_range(FW_CHECK_MSECS * 1000, FW_CHECK_MSECS * 2000);
+ 
+ 	writel(MACREG_A2HRIC_BIT_MASK,
+ 	       priv->iobase1 + MACREG_REG_A2H_INTERRUPT_CLEAR_SEL);
+@@ -95,7 +95,7 @@ int mwl_fwdl_download_firmware(struct ie
+ 
+ 	/* make sure SCRATCH2 C40 is clear, in case we are too quick */
+ 	while (readl(priv->iobase1 + 0xc40) == 0)
+-		;
++		cond_resched();
+ 
+ 	while (size_fw_downloaded < fw->size) {
+ 		len = readl(priv->iobase1 + 0xc40);
+@@ -125,6 +125,7 @@ int mwl_fwdl_download_firmware(struct ie
+ 			int_code = readl(priv->iobase1 + 0xc1c);
+ 			if (int_code != 0)
+ 				break;
++			cond_resched();
+ 			curr_iteration--;
+ 		} while (curr_iteration);
+ 
+@@ -133,6 +134,7 @@ int mwl_fwdl_download_firmware(struct ie
+ 			if ((int_code & MACREG_H2ARIC_BIT_DOOR_BELL) !=
+ 			    MACREG_H2ARIC_BIT_DOOR_BELL)
+ 				break;
++			cond_resched();
+ 			curr_iteration--;
+ 		} while (curr_iteration);
+ 
+@@ -167,12 +169,14 @@ int mwl_fwdl_download_firmware(struct ie
+ 	do {
+ 		curr_iteration--;
+ 		if (priv->mfg_mode && priv->chip_type == MWL8897) {
+-			mdelay(FW_CHECK_MSECS);
++			usleep_range(FW_CHECK_MSECS * 1000,
++				     FW_CHECK_MSECS * 2000);
+ 			int_code = readl(priv->iobase1 + 0xc44);
+ 		} else {
+ 			writel(HOSTCMD_SOFTAP_MODE,
+ 			       priv->iobase1 + MACREG_REG_GEN_PTR);
+-			mdelay(FW_CHECK_MSECS);
++			usleep_range(FW_CHECK_MSECS * 1000,
++				     FW_CHECK_MSECS * 2000);
+ 			int_code = readl(priv->iobase1 + MACREG_REG_INT_CODE);
+ 		}
+ 		if (!(curr_iteration % 0xff) && (int_code != 0))