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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-16 10:36:46 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-16 10:36:46 -0800 |
| commit | 9c7a867ebdef0d484a4c9329007179fbbd08affc (patch) | |
| tree | 0f172745fff4b5fee1086d83982257ac1c2a5cf3 | |
| parent | d3092e4e9937bdc7e3444fea1b47132e53c9cd41 (diff) | |
| parent | 29fae2c1db242a39c5c7c49434fb183f990df2f8 (diff) | |
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
| -rw-r--r-- | drivers/video/backlight/ili922x.c | 3 | ||||
| -rw-r--r-- | drivers/video/backlight/pwm_bl.c | 7 | ||||
| -rw-r--r-- | drivers/video/backlight/tps65217_bl.c | 3 |
3 files changed, 7 insertions, 6 deletions
diff --git a/drivers/video/backlight/ili922x.c b/drivers/video/backlight/ili922x.c index a9e9cef20ed6..2b6c6aaf4e14 100644 --- a/drivers/video/backlight/ili922x.c +++ b/drivers/video/backlight/ili922x.c @@ -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); diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index 9bd17682655a..1c2289ddd555 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -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) diff --git a/drivers/video/backlight/tps65217_bl.c b/drivers/video/backlight/tps65217_bl.c index 5ce8791f4523..380917c86276 100644 --- a/drivers/video/backlight/tps65217_bl.c +++ b/drivers/video/backlight/tps65217_bl.c @@ -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); |