From 4d5ed2621c2437d40b8fe92bd0fd34b0b1870753 Mon Sep 17 00:00:00 2001 From: Marek Behún Date: Mon, 18 Sep 2023 18:11:02 +0200 Subject: leds: turris-omnia: Make set_brightness() more efficient MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Implement caching of the LED color and state values that are sent to MCU in order to make the set_brightness() operation more efficient by avoiding I2C transactions which are not needed. On Turris Omnia's MCU, which acts as the RGB LED controller, each LED has a RGB color, and a ON/OFF state, which are configurable via I2C commands CMD_LED_COLOR and CMD_LED_STATE. The CMD_LED_COLOR command sends 5 bytes and the CMD_LED_STATE command 2 bytes over the I2C bus, which operates at 100 kHz. With I2C overhead this allows ~1670 color changing commands and ~3200 state changing commands per second (or around 1000 color + state changes per second). This may seem more than enough, but the issue is that the I2C bus is shared with another peripheral, the MCU. The MCU exposes an interrupt interface, and it can trigger hundreds of interrupts per second. Each time, we need to read the interrupt state register over this I2C bus. Whenever we are sending a LED color/state changing command, the interrupt reading is waiting. Currently, every time LED brightness or LED multi intensity is changed, we send a CMD_LED_STATE command, and if the computed color (brightness adjusted multi_intensity) is non-zero, we also send a CMD_LED_COLOR command. Consider for example the situation when we have a netdev trigger enabled for a LED. The netdev trigger does not change the LED color, only the brightness (either to 0 or to currently configured brightness), and so there is no need to send the CMD_LED_COLOR command. But each change of brightness to 0 sends one CMD_LED_STATE command, and each change of brightness to max_brightness sends one CMD_LED_STATE command and one CMD_LED_COLOR command: set_brightness(0) -> CMD_LED_STATE set_brightness(255) -> CMD_LED_STATE + CMD_LED_COLOR (unnecessary) We can avoid the unnecessary I2C transactions if we cache the values of state and color that are sent to the controller. If the color does not change from the one previously sent, there is no need to do the CMD_LED_COLOR I2C transaction, and if the state does not change, there is no need to do the CMD_LED_STATE transaction. Because we need to make sure that our cached values are consistent with the controller state, add explicit setting of the LED color to white at probe time (this is the default setting when MCU resets, but does not necessarily need to be the case, for example if U-Boot played with the LED colors). Signed-off-by: Marek Behún Link: https://lore.kernel.org/r/20230918161104.20860-3-kabel@kernel.org Signed-off-by: Lee Jones --- drivers/leds/leds-turris-omnia.c | 96 ++++++++++++++++++++++++++++++++-------- 1 file changed, 78 insertions(+), 18 deletions(-) --- a/drivers/leds/leds-turris-omnia.c +++ b/drivers/leds/leds-turris-omnia.c @@ -30,6 +30,8 @@ struct omnia_led { struct led_classdev_mc mc_cdev; struct mc_subled subled_info[OMNIA_LED_NUM_CHANNELS]; + u8 cached_channels[OMNIA_LED_NUM_CHANNELS]; + bool on; int reg; }; @@ -72,36 +74,82 @@ static int omnia_cmd_read_u8(const struc return -EIO; } +static int omnia_led_send_color_cmd(const struct i2c_client *client, + struct omnia_led *led) +{ + char cmd[5]; + int ret; + + cmd[0] = CMD_LED_COLOR; + cmd[1] = led->reg; + cmd[2] = led->subled_info[0].brightness; + cmd[3] = led->subled_info[1].brightness; + cmd[4] = led->subled_info[2].brightness; + + /* Send the color change command */ + ret = i2c_master_send(client, cmd, 5); + if (ret < 0) + return ret; + + /* Cache the RGB channel brightnesses */ + for (int i = 0; i < OMNIA_LED_NUM_CHANNELS; ++i) + led->cached_channels[i] = led->subled_info[i].brightness; + + return 0; +} + +/* Determine if the computed RGB channels are different from the cached ones */ +static bool omnia_led_channels_changed(struct omnia_led *led) +{ + for (int i = 0; i < OMNIA_LED_NUM_CHANNELS; ++i) + if (led->subled_info[i].brightness != led->cached_channels[i]) + return true; + + return false; +} + static int omnia_led_brightness_set_blocking(struct led_classdev *cdev, enum led_brightness brightness) { struct led_classdev_mc *mc_cdev = lcdev_to_mccdev(cdev); struct omnia_leds *leds = dev_get_drvdata(cdev->dev->parent); struct omnia_led *led = to_omnia_led(mc_cdev); - u8 buf[5], state; - int ret; + int err = 0; mutex_lock(&leds->lock); - led_mc_calc_color_components(&led->mc_cdev, brightness); + /* + * Only recalculate RGB brightnesses from intensities if brightness is + * non-zero. Otherwise we won't be using them and we can save ourselves + * some software divisions (Omnia's CPU does not implement the division + * instruction). + */ + if (brightness) { + led_mc_calc_color_components(mc_cdev, brightness); + + /* + * Send color command only if brightness is non-zero and the RGB + * channel brightnesses changed. + */ + if (omnia_led_channels_changed(led)) + err = omnia_led_send_color_cmd(leds->client, led); + } - buf[0] = CMD_LED_COLOR; - buf[1] = led->reg; - buf[2] = mc_cdev->subled_info[0].brightness; - buf[3] = mc_cdev->subled_info[1].brightness; - buf[4] = mc_cdev->subled_info[2].brightness; - - state = CMD_LED_STATE_LED(led->reg); - if (buf[2] || buf[3] || buf[4]) - state |= CMD_LED_STATE_ON; - - ret = omnia_cmd_write_u8(leds->client, CMD_LED_STATE, state); - if (ret >= 0 && (state & CMD_LED_STATE_ON)) - ret = i2c_master_send(leds->client, buf, 5); + /* Send on/off state change only if (bool)brightness changed */ + if (!err && !brightness != !led->on) { + u8 state = CMD_LED_STATE_LED(led->reg); + + if (brightness) + state |= CMD_LED_STATE_ON; + + err = omnia_cmd_write_u8(leds->client, CMD_LED_STATE, state); + if (!err) + led->on = !!brightness; + } mutex_unlock(&leds->lock); - return ret; + return err; } static int omnia_led_register(struct i2c_client *client, struct omnia_led *led, @@ -129,11 +177,15 @@ static int omnia_led_register(struct i2c } led->subled_info[0].color_index = LED_COLOR_ID_RED; - led->subled_info[0].channel = 0; led->subled_info[1].color_index = LED_COLOR_ID_GREEN; - led->subled_info[1].channel = 1; led->subled_info[2].color_index = LED_COLOR_ID_BLUE; - led->subled_info[2].channel = 2; + + /* Initial color is white */ + for (int i = 0; i < OMNIA_LED_NUM_CHANNELS; ++i) { + led->subled_info[i].intensity = 255; + led->subled_info[i].brightness = 255; + led->subled_info[i].channel = i; + } led->mc_cdev.subled_info = led->subled_info; led->mc_cdev.num_colors = OMNIA_LED_NUM_CHANNELS; @@ -162,6 +214,14 @@ static int omnia_led_register(struct i2c return ret; } + /* Set initial color and cache it */ + ret = omnia_led_send_color_cmd(client, led); + if (ret < 0) { + dev_err(dev, "Cannot set LED %pOF initial color: %i\n", np, + ret); + return ret; + } + ret = devm_led_classdev_multicolor_register_ext(dev, &led->mc_cdev, &init_data); if (ret < 0) {