Commit 9c7a867e authored by Linus Torvalds's avatar Linus Torvalds

Merge tag 'backlight-next-4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight

Pull backlight updates from Lee Jones:

   - handle 32bit overflow in pwm_bl

   - remove redundant code/checks in tps65217_bl and ili922x

* tag 'backlight-next-4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight:
  backlight: ili922x: Remove redundant variable len
  backlight: tps65217_bl: Remove unnecessary default brightness check
  backlight: pwm_bl: Fix overflow condition
parents d3092e4e 29fae2c1
......@@ -251,7 +251,7 @@ static int ili922x_write(struct spi_device *spi, u8 reg, u16 value)
struct spi_transfer xfer_regindex, xfer_regvalue;
unsigned char tbuf[CMD_BUFSIZE];
unsigned char rbuf[CMD_BUFSIZE];
int ret, len = 0;
int ret;
memset(&xfer_regindex, 0, sizeof(struct spi_transfer));
memset(&xfer_regvalue, 0, sizeof(struct spi_transfer));
......@@ -273,7 +273,6 @@ static int ili922x_write(struct spi_device *spi, u8 reg, u16 value)
ret = spi_sync(spi, &msg);
spi_message_init(&msg);
len = 0;
tbuf[0] = set_tx_byte(START_BYTE(ili922x_id, START_RS_REG,
START_RW_WRITE));
tbuf[1] = set_tx_byte((value & 0xFF00) >> 8);
......
......@@ -79,14 +79,17 @@ static void pwm_backlight_power_off(struct pwm_bl_data *pb)
static int compute_duty_cycle(struct pwm_bl_data *pb, int brightness)
{
unsigned int lth = pb->lth_brightness;
int duty_cycle;
u64 duty_cycle;
if (pb->levels)
duty_cycle = pb->levels[brightness];
else
duty_cycle = brightness;
return (duty_cycle * (pb->period - lth) / pb->scale) + lth;
duty_cycle *= pb->period - lth;
do_div(duty_cycle, pb->scale);
return duty_cycle + lth;
}
static int pwm_backlight_update_status(struct backlight_device *bl)
......
......@@ -239,8 +239,7 @@ tps65217_bl_parse_dt(struct platform_device *pdev)
}
if (!of_property_read_u32(node, "default-brightness", &val)) {
if (val < 0 ||
val > 100) {
if (val > 100) {
dev_err(&pdev->dev,
"invalid 'default-brightness' value in the device tree\n");
err = ERR_PTR(-EINVAL);
......
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