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alistair23-linux/drivers/media/dvb-frontends/rtl2832_priv.h
Antti Palosaari b410dae43c [media] rtl2832: implement own lock for regmap 
Introduce own lock to silence lockdep warning. lockdep validator
makes wrong decision when two similar (&map->mutex) locks were taken
recursively, even those are different mutexes in a two different
drivers. After that patch, functionality remains same, but mutex names
are different. That is a temporary hack, proper solution is make
regmap aware of locked nested locking rules.

=============================================
[ INFO: possible recursive locking detected ]
3.18.0-rc4+ #4 Tainted: G           O
---------------------------------------------
kdvb-ad-0-fe-0/2814 is trying to acquire lock:
 (&map->mutex){+.+.+.}, at: [<ffffffff814ec90f>] regmap_lock_mutex+0x2f/0x40

but task is already holding lock:
 (&map->mutex){+.+.+.}, at: [<ffffffff814ec90f>] regmap_lock_mutex+0x2f/0x40

other info that might help us debug this:
 Possible unsafe locking scenario:
       CPU0
       ----
  lock(&map->mutex);
  lock(&map->mutex);

 *** DEADLOCK ***
 May be due to missing lock nesting notation
1 lock held by kdvb-ad-0-fe-0/2814:
 #0:  (&map->mutex){+.+.+.}, at: [<ffffffff814ec90f>] regmap_lock_mutex+0x2f/0x40

stack backtrace:
CPU: 3 PID: 2814 Comm: kdvb-ad-0-fe-0 Tainted: G           O 3.18.0-rc4+ #4
Hardware name: System manufacturer System Product Name/M5A78L-M/USB3, BIOS 2001    09/11/2014
 0000000000000000 00000000410c8772 ffff880293af3868 ffffffff817a6f82
 0000000000000000 ffff8800b3462be0 ffff880293af3968 ffffffff810e7f94
 ffff880293af3888 00000000410c8772 ffffffff82dfee60 ffffffff81ab8f89
Call Trace:
 [<ffffffff817a6f82>] dump_stack+0x4e/0x68
 [<ffffffff810e7f94>] __lock_acquire+0x1ea4/0x1f50
 [<ffffffff810e2a7d>] ? trace_hardirqs_off+0xd/0x10
 [<ffffffff817b01f3>] ? _raw_spin_lock_irqsave+0x83/0xa0
 [<ffffffff810e13e6>] ? up+0x16/0x50
 [<ffffffff810e2a7d>] ? trace_hardirqs_off+0xd/0x10
 [<ffffffff817af8bf>] ? _raw_spin_unlock_irqrestore+0x5f/0x70
 [<ffffffff810e9069>] lock_acquire+0xc9/0x170
 [<ffffffff814ec90f>] ? regmap_lock_mutex+0x2f/0x40
 [<ffffffff817ab50e>] mutex_lock_nested+0x7e/0x430
 [<ffffffff814ec90f>] ? regmap_lock_mutex+0x2f/0x40
 [<ffffffff814ec90f>] ? regmap_lock_mutex+0x2f/0x40
 [<ffffffff817a530b>] ? printk+0x70/0x86
 [<ffffffff8110d9e8>] ? mod_timer+0x168/0x240
 [<ffffffff814ec90f>] regmap_lock_mutex+0x2f/0x40
 [<ffffffff814f08d9>] regmap_update_bits+0x29/0x60
 [<ffffffffa03e9778>] rtl2832_select+0x38/0x70 [rtl2832]
 [<ffffffffa039b03d>] i2c_mux_master_xfer+0x3d/0x90 [i2c_mux]
 [<ffffffff815da493>] __i2c_transfer+0x73/0x2e0
 [<ffffffff815dbaba>] i2c_transfer+0x5a/0xc0
 [<ffffffff815dbb6e>] i2c_master_send+0x4e/0x70
 [<ffffffffa03ff25a>] regmap_i2c_write+0x1a/0x50 [regmap_i2c]
 [<ffffffff817ab713>] ? mutex_lock_nested+0x283/0x430
 [<ffffffff814f06b2>] _regmap_raw_write+0x862/0x880
 [<ffffffff814ec90f>] ? regmap_lock_mutex+0x2f/0x40
 [<ffffffff814f0744>] _regmap_bus_raw_write+0x74/0xa0
 [<ffffffff814ef3d2>] _regmap_write+0x92/0x140
 [<ffffffff814f0b7b>] regmap_write+0x4b/0x70
 [<ffffffffa032b090>] ? dvb_frontend_release+0x110/0x110 [dvb_core]
 [<ffffffffa05141d4>] e4000_init+0x34/0x210 [e4000]
 [<ffffffffa032a029>] dvb_frontend_init+0x59/0xc0 [dvb_core]
 [<ffffffff810bde30>] ? finish_task_switch+0x80/0x180
 [<ffffffff810bddf2>] ? finish_task_switch+0x42/0x180
 [<ffffffffa032b116>] dvb_frontend_thread+0x86/0x7b0 [dvb_core]
 [<ffffffff817a9203>] ? __schedule+0x343/0x930
 [<ffffffffa032b090>] ? dvb_frontend_release+0x110/0x110 [dvb_core]
 [<ffffffff810b826b>] kthread+0x10b/0x130
 [<ffffffff81020099>] ? sched_clock+0x9/0x10
 [<ffffffff810b8160>] ? kthread_create_on_node+0x250/0x250
 [<ffffffff817b063c>] ret_from_fork+0x7c/0xb0
 [<ffffffff810b8160>] ? kthread_create_on_node+0x250/0x250

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
2015-02-03 16:28:12 -02:00

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9.7 KiB
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/*
* Realtek RTL2832 DVB-T demodulator driver
*
* Copyright (C) 2012 Thomas Mair <thomas.mair86@gmail.com>
* Copyright (C) 2012-2014 Antti Palosaari <crope@iki.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef RTL2832_PRIV_H
#define RTL2832_PRIV_H
#include <linux/regmap.h>
#include <linux/math64.h>
#include <linux/bitops.h>
#include "dvb_frontend.h"
#include "dvb_math.h"
#include "rtl2832.h"
struct rtl2832_dev {
struct rtl2832_platform_data *pdata;
struct i2c_client *client;
struct mutex regmap_mutex;
struct regmap_config regmap_config;
struct regmap *regmap;
struct i2c_adapter *i2c_adapter_tuner;
struct dvb_frontend fe;
struct delayed_work stat_work;
fe_status_t fe_status;
u64 post_bit_error_prev; /* for old DVBv3 read_ber() calculation */
u64 post_bit_error;
u64 post_bit_count;
bool sleeping;
struct delayed_work i2c_gate_work;
unsigned long filters; /* PID filter */
};
struct rtl2832_reg_entry {
u16 start_address;
u8 msb;
u8 lsb;
};
struct rtl2832_reg_value {
int reg;
u32 value;
};
/* Demod register bit names */
enum DVBT_REG_BIT_NAME {
DVBT_SOFT_RST,
DVBT_IIC_REPEAT,
DVBT_TR_WAIT_MIN_8K,
DVBT_RSD_BER_FAIL_VAL,
DVBT_EN_BK_TRK,
DVBT_REG_PI,
DVBT_REG_PFREQ_1_0,
DVBT_PD_DA8,
DVBT_LOCK_TH,
DVBT_BER_PASS_SCAL,
DVBT_CE_FFSM_BYPASS,
DVBT_ALPHAIIR_N,
DVBT_ALPHAIIR_DIF,
DVBT_EN_TRK_SPAN,
DVBT_LOCK_TH_LEN,
DVBT_CCI_THRE,
DVBT_CCI_MON_SCAL,
DVBT_CCI_M0,
DVBT_CCI_M1,
DVBT_CCI_M2,
DVBT_CCI_M3,
DVBT_SPEC_INIT_0,
DVBT_SPEC_INIT_1,
DVBT_SPEC_INIT_2,
DVBT_AD_EN_REG,
DVBT_AD_EN_REG1,
DVBT_EN_BBIN,
DVBT_MGD_THD0,
DVBT_MGD_THD1,
DVBT_MGD_THD2,
DVBT_MGD_THD3,
DVBT_MGD_THD4,
DVBT_MGD_THD5,
DVBT_MGD_THD6,
DVBT_MGD_THD7,
DVBT_EN_CACQ_NOTCH,
DVBT_AD_AV_REF,
DVBT_PIP_ON,
DVBT_SCALE1_B92,
DVBT_SCALE1_B93,
DVBT_SCALE1_BA7,
DVBT_SCALE1_BA9,
DVBT_SCALE1_BAA,
DVBT_SCALE1_BAB,
DVBT_SCALE1_BAC,
DVBT_SCALE1_BB0,
DVBT_SCALE1_BB1,
DVBT_KB_P1,
DVBT_KB_P2,
DVBT_KB_P3,
DVBT_OPT_ADC_IQ,
DVBT_AD_AVI,
DVBT_AD_AVQ,
DVBT_K1_CR_STEP12,
DVBT_TRK_KS_P2,
DVBT_TRK_KS_I2,
DVBT_TR_THD_SET2,
DVBT_TRK_KC_P2,
DVBT_TRK_KC_I2,
DVBT_CR_THD_SET2,
DVBT_PSET_IFFREQ,
DVBT_SPEC_INV,
DVBT_BW_INDEX,
DVBT_RSAMP_RATIO,
DVBT_CFREQ_OFF_RATIO,
DVBT_FSM_STAGE,
DVBT_RX_CONSTEL,
DVBT_RX_HIER,
DVBT_RX_C_RATE_LP,
DVBT_RX_C_RATE_HP,
DVBT_GI_IDX,
DVBT_FFT_MODE_IDX,
DVBT_RSD_BER_EST,
DVBT_CE_EST_EVM,
DVBT_RF_AGC_VAL,
DVBT_IF_AGC_VAL,
DVBT_DAGC_VAL,
DVBT_SFREQ_OFF,
DVBT_CFREQ_OFF,
DVBT_POLAR_RF_AGC,
DVBT_POLAR_IF_AGC,
DVBT_AAGC_HOLD,
DVBT_EN_RF_AGC,
DVBT_EN_IF_AGC,
DVBT_IF_AGC_MIN,
DVBT_IF_AGC_MAX,
DVBT_RF_AGC_MIN,
DVBT_RF_AGC_MAX,
DVBT_IF_AGC_MAN,
DVBT_IF_AGC_MAN_VAL,
DVBT_RF_AGC_MAN,
DVBT_RF_AGC_MAN_VAL,
DVBT_DAGC_TRG_VAL,
DVBT_AGC_TARG_VAL,
DVBT_LOOP_GAIN_3_0,
DVBT_LOOP_GAIN_4,
DVBT_VTOP,
DVBT_KRF,
DVBT_AGC_TARG_VAL_0,
DVBT_AGC_TARG_VAL_8_1,
DVBT_AAGC_LOOP_GAIN,
DVBT_LOOP_GAIN2_3_0,
DVBT_LOOP_GAIN2_4,
DVBT_LOOP_GAIN3,
DVBT_VTOP1,
DVBT_VTOP2,
DVBT_VTOP3,
DVBT_KRF1,
DVBT_KRF2,
DVBT_KRF3,
DVBT_KRF4,
DVBT_EN_GI_PGA,
DVBT_THD_LOCK_UP,
DVBT_THD_LOCK_DW,
DVBT_THD_UP1,
DVBT_THD_DW1,
DVBT_INTER_CNT_LEN,
DVBT_GI_PGA_STATE,
DVBT_EN_AGC_PGA,
DVBT_CKOUTPAR,
DVBT_CKOUT_PWR,
DVBT_SYNC_DUR,
DVBT_ERR_DUR,
DVBT_SYNC_LVL,
DVBT_ERR_LVL,
DVBT_VAL_LVL,
DVBT_SERIAL,
DVBT_SER_LSB,
DVBT_CDIV_PH0,
DVBT_CDIV_PH1,
DVBT_MPEG_IO_OPT_2_2,
DVBT_MPEG_IO_OPT_1_0,
DVBT_CKOUTPAR_PIP,
DVBT_CKOUT_PWR_PIP,
DVBT_SYNC_LVL_PIP,
DVBT_ERR_LVL_PIP,
DVBT_VAL_LVL_PIP,
DVBT_CKOUTPAR_PID,
DVBT_CKOUT_PWR_PID,
DVBT_SYNC_LVL_PID,
DVBT_ERR_LVL_PID,
DVBT_VAL_LVL_PID,
DVBT_SM_PASS,
DVBT_UPDATE_REG_2,
DVBT_BTHD_P3,
DVBT_BTHD_D3,
DVBT_FUNC4_REG0,
DVBT_FUNC4_REG1,
DVBT_FUNC4_REG2,
DVBT_FUNC4_REG3,
DVBT_FUNC4_REG4,
DVBT_FUNC4_REG5,
DVBT_FUNC4_REG6,
DVBT_FUNC4_REG7,
DVBT_FUNC4_REG8,
DVBT_FUNC4_REG9,
DVBT_FUNC4_REG10,
DVBT_FUNC5_REG0,
DVBT_FUNC5_REG1,
DVBT_FUNC5_REG2,
DVBT_FUNC5_REG3,
DVBT_FUNC5_REG4,
DVBT_FUNC5_REG5,
DVBT_FUNC5_REG6,
DVBT_FUNC5_REG7,
DVBT_FUNC5_REG8,
DVBT_FUNC5_REG9,
DVBT_FUNC5_REG10,
DVBT_FUNC5_REG11,
DVBT_FUNC5_REG12,
DVBT_FUNC5_REG13,
DVBT_FUNC5_REG14,
DVBT_FUNC5_REG15,
DVBT_FUNC5_REG16,
DVBT_FUNC5_REG17,
DVBT_FUNC5_REG18,
DVBT_AD7_SETTING,
DVBT_RSSI_R,
DVBT_ACI_DET_IND,
DVBT_REG_MON,
DVBT_REG_MONSEL,
DVBT_REG_GPE,
DVBT_REG_GPO,
DVBT_REG_4MSEL,
DVBT_TEST_REG_1,
DVBT_TEST_REG_2,
DVBT_TEST_REG_3,
DVBT_TEST_REG_4,
DVBT_REG_BIT_NAME_ITEM_TERMINATOR,
};
static const struct rtl2832_reg_value rtl2832_tuner_init_tua9001[] = {
{DVBT_DAGC_TRG_VAL, 0x39},
{DVBT_AGC_TARG_VAL_0, 0x0},
{DVBT_AGC_TARG_VAL_8_1, 0x5a},
{DVBT_AAGC_LOOP_GAIN, 0x16},
{DVBT_LOOP_GAIN2_3_0, 0x6},
{DVBT_LOOP_GAIN2_4, 0x1},
{DVBT_LOOP_GAIN3, 0x16},
{DVBT_VTOP1, 0x35},
{DVBT_VTOP2, 0x21},
{DVBT_VTOP3, 0x21},
{DVBT_KRF1, 0x0},
{DVBT_KRF2, 0x40},
{DVBT_KRF3, 0x10},
{DVBT_KRF4, 0x10},
{DVBT_IF_AGC_MIN, 0x80},
{DVBT_IF_AGC_MAX, 0x7f},
{DVBT_RF_AGC_MIN, 0x9c},
{DVBT_RF_AGC_MAX, 0x7f},
{DVBT_POLAR_RF_AGC, 0x0},
{DVBT_POLAR_IF_AGC, 0x0},
{DVBT_AD7_SETTING, 0xe9f4},
{DVBT_OPT_ADC_IQ, 0x1},
{DVBT_AD_AVI, 0x0},
{DVBT_AD_AVQ, 0x0},
{DVBT_SPEC_INV, 0x0},
};
static const struct rtl2832_reg_value rtl2832_tuner_init_fc0012[] = {
{DVBT_DAGC_TRG_VAL, 0x5a},
{DVBT_AGC_TARG_VAL_0, 0x0},
{DVBT_AGC_TARG_VAL_8_1, 0x5a},
{DVBT_AAGC_LOOP_GAIN, 0x16},
{DVBT_LOOP_GAIN2_3_0, 0x6},
{DVBT_LOOP_GAIN2_4, 0x1},
{DVBT_LOOP_GAIN3, 0x16},
{DVBT_VTOP1, 0x35},
{DVBT_VTOP2, 0x21},
{DVBT_VTOP3, 0x21},
{DVBT_KRF1, 0x0},
{DVBT_KRF2, 0x40},
{DVBT_KRF3, 0x10},
{DVBT_KRF4, 0x10},
{DVBT_IF_AGC_MIN, 0x80},
{DVBT_IF_AGC_MAX, 0x7f},
{DVBT_RF_AGC_MIN, 0x80},
{DVBT_RF_AGC_MAX, 0x7f},
{DVBT_POLAR_RF_AGC, 0x0},
{DVBT_POLAR_IF_AGC, 0x0},
{DVBT_AD7_SETTING, 0xe9bf},
{DVBT_EN_GI_PGA, 0x0},
{DVBT_THD_LOCK_UP, 0x0},
{DVBT_THD_LOCK_DW, 0x0},
{DVBT_THD_UP1, 0x11},
{DVBT_THD_DW1, 0xef},
{DVBT_INTER_CNT_LEN, 0xc},
{DVBT_GI_PGA_STATE, 0x0},
{DVBT_EN_AGC_PGA, 0x1},
{DVBT_IF_AGC_MAN, 0x0},
{DVBT_SPEC_INV, 0x0},
};
static const struct rtl2832_reg_value rtl2832_tuner_init_e4000[] = {
{DVBT_DAGC_TRG_VAL, 0x5a},
{DVBT_AGC_TARG_VAL_0, 0x0},
{DVBT_AGC_TARG_VAL_8_1, 0x5a},
{DVBT_AAGC_LOOP_GAIN, 0x18},
{DVBT_LOOP_GAIN2_3_0, 0x8},
{DVBT_LOOP_GAIN2_4, 0x1},
{DVBT_LOOP_GAIN3, 0x18},
{DVBT_VTOP1, 0x35},
{DVBT_VTOP2, 0x21},
{DVBT_VTOP3, 0x21},
{DVBT_KRF1, 0x0},
{DVBT_KRF2, 0x40},
{DVBT_KRF3, 0x10},
{DVBT_KRF4, 0x10},
{DVBT_IF_AGC_MIN, 0x80},
{DVBT_IF_AGC_MAX, 0x7f},
{DVBT_RF_AGC_MIN, 0x80},
{DVBT_RF_AGC_MAX, 0x7f},
{DVBT_POLAR_RF_AGC, 0x0},
{DVBT_POLAR_IF_AGC, 0x0},
{DVBT_AD7_SETTING, 0xe9d4},
{DVBT_EN_GI_PGA, 0x0},
{DVBT_THD_LOCK_UP, 0x0},
{DVBT_THD_LOCK_DW, 0x0},
{DVBT_THD_UP1, 0x14},
{DVBT_THD_DW1, 0xec},
{DVBT_INTER_CNT_LEN, 0xc},
{DVBT_GI_PGA_STATE, 0x0},
{DVBT_EN_AGC_PGA, 0x1},
{DVBT_REG_GPE, 0x1},
{DVBT_REG_GPO, 0x1},
{DVBT_REG_MONSEL, 0x1},
{DVBT_REG_MON, 0x1},
{DVBT_REG_4MSEL, 0x0},
{DVBT_SPEC_INV, 0x0},
};
static const struct rtl2832_reg_value rtl2832_tuner_init_r820t[] = {
{DVBT_DAGC_TRG_VAL, 0x39},
{DVBT_AGC_TARG_VAL_0, 0x0},
{DVBT_AGC_TARG_VAL_8_1, 0x40},
{DVBT_AAGC_LOOP_GAIN, 0x16},
{DVBT_LOOP_GAIN2_3_0, 0x8},
{DVBT_LOOP_GAIN2_4, 0x1},
{DVBT_LOOP_GAIN3, 0x18},
{DVBT_VTOP1, 0x35},
{DVBT_VTOP2, 0x21},
{DVBT_VTOP3, 0x21},
{DVBT_KRF1, 0x0},
{DVBT_KRF2, 0x40},
{DVBT_KRF3, 0x10},
{DVBT_KRF4, 0x10},
{DVBT_IF_AGC_MIN, 0x80},
{DVBT_IF_AGC_MAX, 0x7f},
{DVBT_RF_AGC_MIN, 0x80},
{DVBT_RF_AGC_MAX, 0x7f},
{DVBT_POLAR_RF_AGC, 0x0},
{DVBT_POLAR_IF_AGC, 0x0},
{DVBT_AD7_SETTING, 0xe9f4},
{DVBT_SPEC_INV, 0x1},
};
#endif /* RTL2832_PRIV_H */
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