disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/drivers/media/dvb-frontends/cxd2841er.c
..
..
@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * cxd2841er.c
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  *
..
..
@@ -9,16 +10,6 @@
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  * Copyright (C) 2014 NetUP Inc.
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  * Copyright (C) 2014 Sergey Kozlov <serjk@netup.ru>
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  * Copyright (C) 2014 Abylay Ospan <aospan@netup.ru>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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   */
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14
 
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 #include <linux/module.h>
..
..
@@ -69,6 +60,7 @@
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 	enum cxd2841er_xtal		xtal;
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 	enum fe_caps caps;
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 	u32				flags;
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+	unsigned long			stats_time;
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 };
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 static const struct cxd2841er_cnr_data s_cn_data[] = {
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@@ -2947,7 +2939,7 @@
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 		((priv->flags & CXD2841ER_ASCOT) ? 0x01 : 0x00), 0x01);
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 	/* Set SLV-T Bank : 0x18 */
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 	cxd2841er_write_reg(priv, I2C_SLVT, 0x00, 0x18);
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-	/* Pre-RS BER moniter setting */
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+	/* Pre-RS BER monitor setting */
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 	cxd2841er_set_reg_bits(priv, I2C_SLVT, 0x36, 0x40, 0x07);
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 	/* FEC Auto Recovery setting */
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 	cxd2841er_set_reg_bits(priv, I2C_SLVT, 0x30, 0x01, 0x01);
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@@ -3288,9 +3280,15 @@
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 		p->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
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 	if (status & FE_HAS_LOCK) {
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+		if (priv->stats_time &&
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+		    (!time_after(jiffies, priv->stats_time)))
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+			return 0;
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+
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+		/* Prevent retrieving stats faster than once per second */
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+		priv->stats_time = jiffies + msecs_to_jiffies(1000);
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+
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 		cxd2841er_read_snr(fe);
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 		cxd2841er_read_ucblocks(fe);
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-
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 		cxd2841er_read_ber(fe);
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 	} else {
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 		p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
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@@ -3368,6 +3366,9 @@
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 	p->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
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 	p->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
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 	p->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
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+
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+	/* Reset the wait for jiffies logic */
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+	priv->stats_time = 0;
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 	return ret;
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 }
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@@ -3929,14 +3930,14 @@
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 {
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 	return cxd2841er_attach(cfg, i2c, SYS_DVBS);
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 }
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-EXPORT_SYMBOL(cxd2841er_attach_s);
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+EXPORT_SYMBOL_GPL(cxd2841er_attach_s);
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 struct dvb_frontend *cxd2841er_attach_t_c(struct cxd2841er_config *cfg,
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 					struct i2c_adapter *i2c)
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 {
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 	return cxd2841er_attach(cfg, i2c, 0);
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 }
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-EXPORT_SYMBOL(cxd2841er_attach_t_c);
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+EXPORT_SYMBOL_GPL(cxd2841er_attach_t_c);
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 static const struct dvb_frontend_ops cxd2841er_dvbs_s2_ops = {
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 	.delsys = { SYS_DVBS, SYS_DVBS2 },