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Revert "Staging: panel: usleep_range is preferred over udelay"

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This reverts commit ebd43516d3.

We should not be sleeping inside spin_lock.

Fixes: ebd43516d3 ("Staging: panel: usleep_range is preferred over udelay")
Cc: Sirnam Swetha <theonly.ultimate@gmail.com>
Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Reported-by: Huang, Ying <ying.huang@intel.com>
Tested-by: Huang, Ying <ying.huang@intel.com>
Cc: stable <stable@vger.kernel.org> # 4.4
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sudip Mukherjee 2016-01-23 14:49:20 +05:30 committed by Greg Kroah-Hartman
parent f744c423ca
commit b64a1cbef6
1 changed files with 15 additions and 19 deletions
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34
drivers/staging/panel/panel.c
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@ -825,8 +825,7 @@ static void lcd_write_cmd_s(int cmd)
lcd_send_serial(0x1F); /* R/W=W, RS=0 */
lcd_send_serial(cmd & 0x0F);
lcd_send_serial((cmd >> 4) & 0x0F);
/* the shortest command takes at least 40 us */
usleep_range(40, 100);
udelay(40); /* the shortest command takes at least 40 us */
spin_unlock_irq(&pprt_lock);
}
@ -837,8 +836,7 @@ static void lcd_write_data_s(int data)
lcd_send_serial(0x5F); /* R/W=W, RS=1 */
lcd_send_serial(data & 0x0F);
lcd_send_serial((data >> 4) & 0x0F);
/* the shortest data takes at least 40 us */
usleep_range(40, 100);
udelay(40); /* the shortest data takes at least 40 us */
spin_unlock_irq(&pprt_lock);
}
@ -848,20 +846,19 @@ static void lcd_write_cmd_p8(int cmd)
spin_lock_irq(&pprt_lock);
/* present the data to the data port */
w_dtr(pprt, cmd);
/* maintain the data during 20 us before the strobe */
usleep_range(20, 100);
udelay(20); /* maintain the data during 20 us before the strobe */
bits.e = BIT_SET;
bits.rs = BIT_CLR;
bits.rw = BIT_CLR;
set_ctrl_bits();
usleep_range(40, 100); /* maintain the strobe during 40 us */
udelay(40); /* maintain the strobe during 40 us */
bits.e = BIT_CLR;
set_ctrl_bits();
usleep_range(120, 500); /* the shortest command takes at least 120 us */
udelay(120); /* the shortest command takes at least 120 us */
spin_unlock_irq(&pprt_lock);
}
@ -871,20 +868,19 @@ static void lcd_write_data_p8(int data)
spin_lock_irq(&pprt_lock);
/* present the data to the data port */
w_dtr(pprt, data);
/* maintain the data during 20 us before the strobe */
usleep_range(20, 100);
udelay(20); /* maintain the data during 20 us before the strobe */
bits.e = BIT_SET;
bits.rs = BIT_SET;
bits.rw = BIT_CLR;
set_ctrl_bits();
usleep_range(40, 100); /* maintain the strobe during 40 us */
udelay(40); /* maintain the strobe during 40 us */
bits.e = BIT_CLR;
set_ctrl_bits();
usleep_range(45, 100); /* the shortest data takes at least 45 us */
udelay(45); /* the shortest data takes at least 45 us */
spin_unlock_irq(&pprt_lock);
}
@ -894,7 +890,7 @@ static void lcd_write_cmd_tilcd(int cmd)
spin_lock_irq(&pprt_lock);
/* present the data to the control port */
w_ctr(pprt, cmd);
usleep_range(60, 120);
udelay(60);
spin_unlock_irq(&pprt_lock);
}
@ -904,7 +900,7 @@ static void lcd_write_data_tilcd(int data)
spin_lock_irq(&pprt_lock);
/* present the data to the data port */
w_dtr(pprt, data);
usleep_range(60, 120);
udelay(60);
spin_unlock_irq(&pprt_lock);
}
@ -947,7 +943,7 @@ static void lcd_clear_fast_s(void)
lcd_send_serial(0x5F); /* R/W=W, RS=1 */
lcd_send_serial(' ' & 0x0F);
lcd_send_serial((' ' >> 4) & 0x0F);
usleep_range(40, 100); /* the shortest data takes at least 40 us */
udelay(40); /* the shortest data takes at least 40 us */
}
spin_unlock_irq(&pprt_lock);
@ -971,7 +967,7 @@ static void lcd_clear_fast_p8(void)
w_dtr(pprt, ' ');
/* maintain the data during 20 us before the strobe */
usleep_range(20, 100);
udelay(20);
bits.e = BIT_SET;
bits.rs = BIT_SET;
@ -979,13 +975,13 @@ static void lcd_clear_fast_p8(void)
set_ctrl_bits();
/* maintain the strobe during 40 us */
usleep_range(40, 100);
udelay(40);
bits.e = BIT_CLR;
set_ctrl_bits();
/* the shortest data takes at least 45 us */
usleep_range(45, 100);
udelay(45);
}
spin_unlock_irq(&pprt_lock);
@ -1007,7 +1003,7 @@ static void lcd_clear_fast_tilcd(void)
for (pos = 0; pos < lcd.height * lcd.hwidth; pos++) {
/* present the data to the data port */
w_dtr(pprt, ' ');
usleep_range(60, 120);
udelay(60);
}
spin_unlock_irq(&pprt_lock);