diff options
author | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2021-09-15 17:12:51 +0300 |
---|---|---|
committer | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2021-09-15 17:12:51 +0300 |
commit | d1b803f4ca4f25d6f171219d039f9410a10b29ee (patch) | |
tree | 44ce0f4ab320f9a3a63cf7518931c5209da6d94a /drivers/video | |
parent | 5f0d4214938db66969a50d4b1262307e39f4f2b2 (diff) | |
parent | 6880fa6c56601bb8ed59df6c30fd390cc5f6dd8f (diff) |
Merge drm/drm-next into drm-intel-next
Catch-up on 5.15-rc1 and sync with drm-intel-gt-next
to prepare the PXP topic branch.
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Diffstat (limited to 'drivers/video')
-rw-r--r-- | drivers/video/backlight/ktd253-backlight.c | 75 | ||||
-rw-r--r-- | drivers/video/backlight/pwm_bl.c | 54 | ||||
-rw-r--r-- | drivers/video/fbdev/core/fbmem.c | 6 |
3 files changed, 89 insertions, 46 deletions
diff --git a/drivers/video/backlight/ktd253-backlight.c b/drivers/video/backlight/ktd253-backlight.c index a7df5bcca9da..37aa5a669530 100644 --- a/drivers/video/backlight/ktd253-backlight.c +++ b/drivers/video/backlight/ktd253-backlight.c @@ -25,6 +25,7 @@ #define KTD253_T_LOW_NS (200 + 10) /* Additional 10ns as safety factor */ #define KTD253_T_HIGH_NS (200 + 10) /* Additional 10ns as safety factor */ +#define KTD253_T_OFF_CRIT_NS 100000 /* 100 us, now it doesn't look good */ #define KTD253_T_OFF_MS 3 struct ktd253_backlight { @@ -34,13 +35,50 @@ struct ktd253_backlight { u16 ratio; }; +static void ktd253_backlight_set_max_ratio(struct ktd253_backlight *ktd253) +{ + gpiod_set_value_cansleep(ktd253->gpiod, 1); + ndelay(KTD253_T_HIGH_NS); + /* We always fall back to this when we power on */ +} + +static int ktd253_backlight_stepdown(struct ktd253_backlight *ktd253) +{ + /* + * These GPIO operations absolutely can NOT sleep so no _cansleep + * suffixes, and no using GPIO expanders on slow buses for this! + * + * The maximum number of cycles of the loop is 32 so the time taken + * should nominally be: + * (T_LOW_NS + T_HIGH_NS + loop_time) * 32 + * + * Architectures do not always support ndelay() and we will get a few us + * instead. If we get to a critical time limit an interrupt has likely + * occured in the low part of the loop and we need to restart from the + * top so we have the backlight in a known state. + */ + u64 ns; + + ns = ktime_get_ns(); + gpiod_set_value(ktd253->gpiod, 0); + ndelay(KTD253_T_LOW_NS); + gpiod_set_value(ktd253->gpiod, 1); + ns = ktime_get_ns() - ns; + if (ns >= KTD253_T_OFF_CRIT_NS) { + dev_err(ktd253->dev, "PCM on backlight took too long (%llu ns)\n", ns); + return -EAGAIN; + } + ndelay(KTD253_T_HIGH_NS); + return 0; +} + static int ktd253_backlight_update_status(struct backlight_device *bl) { struct ktd253_backlight *ktd253 = bl_get_data(bl); int brightness = backlight_get_brightness(bl); u16 target_ratio; u16 current_ratio = ktd253->ratio; - unsigned long flags; + int ret; dev_dbg(ktd253->dev, "new brightness/ratio: %d/32\n", brightness); @@ -62,37 +100,34 @@ static int ktd253_backlight_update_status(struct backlight_device *bl) } if (current_ratio == 0) { - gpiod_set_value_cansleep(ktd253->gpiod, 1); - ndelay(KTD253_T_HIGH_NS); - /* We always fall back to this when we power on */ + ktd253_backlight_set_max_ratio(ktd253); current_ratio = KTD253_MAX_RATIO; } - /* - * WARNING: - * The loop to set the correct current level is performed - * with interrupts disabled as it is timing critical. - * The maximum number of cycles of the loop is 32 - * so the time taken will be (T_LOW_NS + T_HIGH_NS + loop_time) * 32, - */ - local_irq_save(flags); while (current_ratio != target_ratio) { /* * These GPIO operations absolutely can NOT sleep so no * _cansleep suffixes, and no using GPIO expanders on * slow buses for this! */ - gpiod_set_value(ktd253->gpiod, 0); - ndelay(KTD253_T_LOW_NS); - gpiod_set_value(ktd253->gpiod, 1); - ndelay(KTD253_T_HIGH_NS); - /* After 1/32 we loop back to 32/32 */ - if (current_ratio == KTD253_MIN_RATIO) + ret = ktd253_backlight_stepdown(ktd253); + if (ret == -EAGAIN) { + /* + * Something disturbed the backlight setting code when + * running so we need to bring the PWM back to a known + * state. This shouldn't happen too much. + */ + gpiod_set_value_cansleep(ktd253->gpiod, 0); + msleep(KTD253_T_OFF_MS); + ktd253_backlight_set_max_ratio(ktd253); + current_ratio = KTD253_MAX_RATIO; + } else if (current_ratio == KTD253_MIN_RATIO) { + /* After 1/32 we loop back to 32/32 */ current_ratio = KTD253_MAX_RATIO; - else + } else { current_ratio--; + } } - local_irq_restore(flags); ktd253->ratio = current_ratio; dev_dbg(ktd253->dev, "new ratio set to %d/32\n", target_ratio); diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index e48fded3e414..8d8959a70e44 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -409,6 +409,33 @@ static bool pwm_backlight_is_linear(struct platform_pwm_backlight_data *data) static int pwm_backlight_initial_power_state(const struct pwm_bl_data *pb) { struct device_node *node = pb->dev->of_node; + bool active = true; + + /* + * If the enable GPIO is present, observable (either as input + * or output) and off then the backlight is not currently active. + * */ + if (pb->enable_gpio && gpiod_get_value_cansleep(pb->enable_gpio) == 0) + active = false; + + if (!regulator_is_enabled(pb->power_supply)) + active = false; + + if (!pwm_is_enabled(pb->pwm)) + active = false; + + /* + * Synchronize the enable_gpio with the observed state of the + * hardware. + */ + if (pb->enable_gpio) + gpiod_direction_output(pb->enable_gpio, active); + + /* + * Do not change pb->enabled here! pb->enabled essentially + * tells us if we own one of the regulator's use counts and + * right now we do not. + */ /* Not booted with device tree or no phandle link to the node */ if (!node || !node->phandle) @@ -420,20 +447,7 @@ static int pwm_backlight_initial_power_state(const struct pwm_bl_data *pb) * assume that another driver will enable the backlight at the * appropriate time. Therefore, if it is disabled, keep it so. */ - - /* if the enable GPIO is disabled, do not enable the backlight */ - if (pb->enable_gpio && gpiod_get_value_cansleep(pb->enable_gpio) == 0) - return FB_BLANK_POWERDOWN; - - /* The regulator is disabled, do not enable the backlight */ - if (!regulator_is_enabled(pb->power_supply)) - return FB_BLANK_POWERDOWN; - - /* The PWM is disabled, keep it like this */ - if (!pwm_is_enabled(pb->pwm)) - return FB_BLANK_POWERDOWN; - - return FB_BLANK_UNBLANK; + return active ? FB_BLANK_UNBLANK: FB_BLANK_POWERDOWN; } static int pwm_backlight_probe(struct platform_device *pdev) @@ -486,18 +500,6 @@ static int pwm_backlight_probe(struct platform_device *pdev) goto err_alloc; } - /* - * If the GPIO is not known to be already configured as output, that - * is, if gpiod_get_direction returns either 1 or -EINVAL, change the - * direction to output and set the GPIO as active. - * Do not force the GPIO to active when it was already output as it - * could cause backlight flickering or we would enable the backlight too - * early. Leave the decision of the initial backlight state for later. - */ - if (pb->enable_gpio && - gpiod_get_direction(pb->enable_gpio) != 0) - gpiod_direction_output(pb->enable_gpio, 1); - pb->power_supply = devm_regulator_get(&pdev->dev, "power"); if (IS_ERR(pb->power_supply)) { ret = PTR_ERR(pb->power_supply); diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c index 71fb710f1ce3..7420d2c16e47 100644 --- a/drivers/video/fbdev/core/fbmem.c +++ b/drivers/video/fbdev/core/fbmem.c @@ -962,6 +962,7 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) struct fb_var_screeninfo old_var; struct fb_videomode mode; struct fb_event event; + u32 unused; if (var->activate & FB_ACTIVATE_INV_MODE) { struct fb_videomode mode1, mode2; @@ -1008,6 +1009,11 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) if (var->xres < 8 || var->yres < 8) return -EINVAL; + /* Too huge resolution causes multiplication overflow. */ + if (check_mul_overflow(var->xres, var->yres, &unused) || + check_mul_overflow(var->xres_virtual, var->yres_virtual, &unused)) + return -EINVAL; + ret = info->fbops->fb_check_var(var, info); if (ret) |