From ebd43516d3879f882a403836bba8bc5791f26a28 Mon Sep 17 00:00:00 2001 From: Sirnam Swetha Date: Tue, 27 Oct 2015 14:55:46 +0530 Subject: [PATCH] Staging: panel: usleep_range is preferred over udelay This patch fixes the issue: CHECK: usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt Signed-off-by: Sirnam Swetha Signed-off-by: Greg Kroah-Hartman --- drivers/staging/panel/panel.c | 34 +++++++++++++++++++--------------- 1 file changed, 19 insertions(+), 15 deletions(-) diff --git a/drivers/staging/panel/panel.c b/drivers/staging/panel/panel.c index e62672b..775ad0e 100644 --- a/drivers/staging/panel/panel.c +++ b/drivers/staging/panel/panel.c @@ -825,7 +825,8 @@ 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); - udelay(40); /* the shortest command takes at least 40 us */ + /* the shortest command takes at least 40 us */ + usleep_range(40, 100); spin_unlock_irq(&pprt_lock); } @@ -836,7 +837,8 @@ 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); - udelay(40); /* the shortest data takes at least 40 us */ + /* the shortest data takes at least 40 us */ + usleep_range(40, 100); spin_unlock_irq(&pprt_lock); } @@ -846,19 +848,20 @@ static void lcd_write_cmd_p8(int cmd) spin_lock_irq(&pprt_lock); /* present the data to the data port */ w_dtr(pprt, cmd); - udelay(20); /* maintain the data during 20 us before the strobe */ + /* maintain the data during 20 us before the strobe */ + usleep_range(20, 100); bits.e = BIT_SET; bits.rs = BIT_CLR; bits.rw = BIT_CLR; set_ctrl_bits(); - udelay(40); /* maintain the strobe during 40 us */ + usleep_range(40, 100); /* maintain the strobe during 40 us */ bits.e = BIT_CLR; set_ctrl_bits(); - udelay(120); /* the shortest command takes at least 120 us */ + usleep_range(120, 500); /* the shortest command takes at least 120 us */ spin_unlock_irq(&pprt_lock); } @@ -868,19 +871,20 @@ static void lcd_write_data_p8(int data) spin_lock_irq(&pprt_lock); /* present the data to the data port */ w_dtr(pprt, data); - udelay(20); /* maintain the data during 20 us before the strobe */ + /* maintain the data during 20 us before the strobe */ + usleep_range(20, 100); bits.e = BIT_SET; bits.rs = BIT_SET; bits.rw = BIT_CLR; set_ctrl_bits(); - udelay(40); /* maintain the strobe during 40 us */ + usleep_range(40, 100); /* maintain the strobe during 40 us */ bits.e = BIT_CLR; set_ctrl_bits(); - udelay(45); /* the shortest data takes at least 45 us */ + usleep_range(45, 100); /* the shortest data takes at least 45 us */ spin_unlock_irq(&pprt_lock); } @@ -890,7 +894,7 @@ static void lcd_write_cmd_tilcd(int cmd) spin_lock_irq(&pprt_lock); /* present the data to the control port */ w_ctr(pprt, cmd); - udelay(60); + usleep_range(60, 120); spin_unlock_irq(&pprt_lock); } @@ -900,7 +904,7 @@ static void lcd_write_data_tilcd(int data) spin_lock_irq(&pprt_lock); /* present the data to the data port */ w_dtr(pprt, data); - udelay(60); + usleep_range(60, 120); spin_unlock_irq(&pprt_lock); } @@ -943,7 +947,7 @@ 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); - udelay(40); /* the shortest data takes at least 40 us */ + usleep_range(40, 100); /* the shortest data takes at least 40 us */ } spin_unlock_irq(&pprt_lock); @@ -967,7 +971,7 @@ static void lcd_clear_fast_p8(void) w_dtr(pprt, ' '); /* maintain the data during 20 us before the strobe */ - udelay(20); + usleep_range(20, 100); bits.e = BIT_SET; bits.rs = BIT_SET; @@ -975,13 +979,13 @@ static void lcd_clear_fast_p8(void) set_ctrl_bits(); /* maintain the strobe during 40 us */ - udelay(40); + usleep_range(40, 100); bits.e = BIT_CLR; set_ctrl_bits(); /* the shortest data takes at least 45 us */ - udelay(45); + usleep_range(45, 100); } spin_unlock_irq(&pprt_lock); @@ -1003,7 +1007,7 @@ 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, ' '); - udelay(60); + usleep_range(60, 120); } spin_unlock_irq(&pprt_lock); -- 2.7.4