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SubjectRe: [PATCH V4 2/4] backlight: qcom-wled: Add callback functions
On Mon, Mar 23, 2020 at 11:16:56PM +0530, Kiran Gunda wrote:
> Add wled_cabc_config, wled_sync_toggle, wled_ovp_fault_status
> and wled_ovp_delay callback functions to prepare the driver for
> adding WLED5 support.
>
> wled_cabc_config() ===> Used to configure the cabc register.
> It is applicable for wled4 and wled5.
>
> wled_sync_toggle() ===> used to toggle the Sync register bit for the
> brightness update to take place.
> It is applicable for WLED3, WLED4 and WLED5.
>
> wled_ovp_fault_status() ===> Used to determine if the OVP fault is triggered.
> It is applicable for WLED4 and WLED5.
>
> wled_ovp_delay() ===> Provides the time to wait before checking the OVP status
> after wled module enable.
> It is applicable for WLED4 and WLED5.

These look like comments to me. Move them out of the patch header and
make them into real comments!


> Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>

This patch does not compile. Please fix this.


> ---
> drivers/video/backlight/qcom-wled.c | 188 ++++++++++++++++++++++--------------
> 1 file changed, 118 insertions(+), 70 deletions(-)
>
> diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
> index 3d276b3..a3daf9e 100644
> --- a/drivers/video/backlight/qcom-wled.c
> +++ b/drivers/video/backlight/qcom-wled.c
> @@ -147,6 +147,7 @@ struct wled {
> u32 max_brightness;
> u32 short_count;
> u32 auto_detect_count;
> + u32 version;

Why does some of the changes here use function pointers and other parts
use if/else networks (wled->version == X) ?

Overall I almost wonder if the reduced clarify that comes from function
pointers is actually adding much value?


> bool disabled_by_short;
> bool has_short_detect;
> int short_irq;
> @@ -155,6 +156,10 @@ struct wled {
> struct wled_config cfg;
> struct delayed_work ovp_work;
> int (*wled_set_brightness)(struct wled *wled, u16 brightness);
> + int (*wled_cabc_config)(struct wled *wled, bool enable);
> + int (*wled_sync_toggle)(struct wled *wled);
> + int (*wled_ovp_fault_status)(struct wled *wled, bool *fault_set);
> + int (*wled_ovp_delay)(struct wled *wled);
> };
>
> static int wled3_set_brightness(struct wled *wled, u16 brightness)
> @@ -237,7 +242,7 @@ static int wled_module_enable(struct wled *wled, int val)
> return 0;
> }
>
> -static int wled_sync_toggle(struct wled *wled)
> +static int wled3_sync_toggle(struct wled *wled)
> {
> int rc;
> unsigned int mask = GENMASK(wled->max_string_count - 1, 0);
> @@ -255,6 +260,46 @@ static int wled_sync_toggle(struct wled *wled)
> return rc;
> }
>
> +static int wled4_ovp_fault_status(struct wled *wled, bool *fault_set)
> +{
> + int rc;
> + u32 int_rt_sts, fault_sts;
> +
> + *fault_set = false;
> + rc = regmap_read(wled->regmap,
> + wled->ctrl_addr + WLED3_CTRL_REG_INT_RT_STS,
> + &int_rt_sts);
> + if (rc < 0) {
> + dev_err(wled->dev, "Failed to read INT_RT_STS rc=%d\n", rc);
> + return rc;
> + }
> +
> + rc = regmap_read(wled->regmap,
> + wled->ctrl_addr + WLED3_CTRL_REG_FAULT_STATUS,
> + &fault_sts);
> + if (rc < 0) {
> + dev_err(wled->dev, "Failed to read FAULT_STATUS rc=%d\n", rc);
> + return rc;
> + }
> +
> + if (int_rt_sts & WLED3_CTRL_REG_OVP_FAULT_STATUS)
> + *fault_set = true;
> +
> + if (fault_sts & WLED3_CTRL_REG_OVP_FAULT_BIT)
> + *fault_set = true;
> +
> + if (*fault_set)
> + dev_dbg(wled->dev, "WLED OVP fault detected, int_rt_sts=0x%x fault_sts=0x%x\n",
> + int_rt_sts, fault_sts);
> +
> + return rc;
> +}
> +
> +static int wled4_ovp_delay(struct wled *wled)
> +{
> + return WLED_SOFT_START_DLY_US;
> +}
> +
> static int wled_update_status(struct backlight_device *bl)
> {
> struct wled *wled = bl_get_data(bl);
> @@ -275,7 +320,7 @@ static int wled_update_status(struct backlight_device *bl)
> goto unlock_mutex;
> }
>
> - rc = wled_sync_toggle(wled);
> + rc = wled->wled_sync_toggle(wled);
> if (rc < 0) {
> dev_err(wled->dev, "wled sync failed rc:%d\n", rc);
> goto unlock_mutex;
> @@ -298,6 +343,25 @@ static int wled_update_status(struct backlight_device *bl)
> return rc;
> }
>
> +static int wled4_cabc_config(struct wled *wled, bool enable)
> +{
> + int i, j, rc;
> + u8 val;
> +
> + for (i = 0; i < wled->cfg.num_strings; i++) {
> + j = wled->cfg.enabled_strings[i];
> +
> + val = enable ? WLED4_SINK_REG_STR_CABC_MASK : 0;
> + rc = regmap_update_bits(wled->regmap, wled->sink_addr +
> + WLED4_SINK_REG_STR_CABC(j),
> + WLED4_SINK_REG_STR_CABC_MASK, val);
> + if (rc < 0)
> + return rc;
> + }
> +
> + return 0;
> +}
> +
> #define WLED_SHORT_DLY_MS 20
> #define WLED_SHORT_CNT_MAX 5
> #define WLED_SHORT_RESET_CNT_DLY_US USEC_PER_SEC
> @@ -345,9 +409,10 @@ static irqreturn_t wled_short_irq_handler(int irq, void *_wled)
>
> static void wled_auto_string_detection(struct wled *wled)
> {
> - int rc = 0, i;
> - u32 sink_config = 0, int_sts;
> + int rc = 0, i, delay_time_us;
> + u32 sink_config = 0;
> u8 sink_test = 0, sink_valid = 0, val;
> + bool fault_set;
>
> /* Read configured sink configuration */
> rc = regmap_read(wled->regmap, wled->sink_addr +
> @@ -376,14 +441,9 @@ static void wled_auto_string_detection(struct wled *wled)
> }
>
> if (wled->cfg.cabc) {
> - for (i = 0; i < wled->cfg.num_strings; i++) {
> - rc = regmap_update_bits(wled->regmap, wled->sink_addr +
> - WLED4_SINK_REG_STR_CABC(i),
> - WLED4_SINK_REG_STR_CABC_MASK,
> - 0);
> - if (rc < 0)
> - goto failed_detect;
> - }
> + rc = wled->wled_cabc_config(wled, 0);

Be consistent with the argument (elsewhere it is true/false).


> + if (rc < 0)
> + goto failed_detect;
> }
>
> /* Disable all sinks */
> @@ -427,18 +487,17 @@ static void wled_auto_string_detection(struct wled *wled)
> goto failed_detect;
> }
>
> - usleep_range(WLED_SOFT_START_DLY_US,
> - WLED_SOFT_START_DLY_US + 1000);
> + delay_time_us = wled->wled_ovp_delay(wled);
> + usleep_range(delay_time_us, delay_time_us + 1000);
>
> - rc = regmap_read(wled->regmap, wled->ctrl_addr +
> - WLED3_CTRL_REG_INT_RT_STS, &int_sts);
> + rc = wled->wled_ovp_fault_status(wled, &fault_set);
> if (rc < 0) {
> - dev_err(wled->dev, "Error in reading WLED3_CTRL_INT_RT_STS rc=%d\n",
> + dev_err(wled->dev, "Error in getting OVP fault_sts, rc=%d\n",
> rc);
> goto failed_detect;
> }
>


> - if (int_sts & WLED3_CTRL_REG_OVP_FAULT_STATUS)
> + if (fault_set)
> dev_dbg(wled->dev, "WLED OVP fault detected with SINK %d\n",
> i + 1);
> else
> @@ -478,30 +537,30 @@ static void wled_auto_string_detection(struct wled *wled)
> }
>
> /* Enable valid sinks */
> - for (i = 0; i < wled->cfg.num_strings; i++) {
> - if (wled->cfg.cabc) {
> - rc = regmap_update_bits(wled->regmap, wled->sink_addr +
> - WLED4_SINK_REG_STR_CABC(i),
> - WLED4_SINK_REG_STR_CABC_MASK,
> - WLED4_SINK_REG_STR_CABC_MASK);
> - if (rc < 0)
> + if (wled->version == 4) {
> + for (i = 0; i < wled->cfg.num_strings; i++) {
> + if (sink_config &
> + BIT(WLED4_SINK_REG_CURR_SINK_SHFT + i))
> + val = WLED4_SINK_REG_STR_MOD_MASK;
> + else
> + /* Disable modulator_en for unused sink */
> + val = 0x0;
> +
> + rc = regmap_write(wled->regmap, wled->sink_addr +
> + WLED4_SINK_REG_STR_MOD_EN(i), val);
> + if (rc < 0) {
> + dev_err(wled->dev, "Failed to configure MODULATOR_EN rc=%d\n",
> + rc);
> goto failed_detect;
> - }
> -
> - if (sink_config & BIT(WLED4_SINK_REG_CURR_SINK_SHFT + i))
> - val = WLED4_SINK_REG_STR_MOD_MASK;
> - else
> - val = 0x0; /* Disable modulator_en for unused sink */
> -
> - rc = regmap_write(wled->regmap, wled->sink_addr +
> - WLED4_SINK_REG_STR_MOD_EN(i), val);
> - if (rc < 0) {
> - dev_err(wled->dev, "Failed to configure MODULATOR_EN rc=%d\n",
> - rc);
> - goto failed_detect;
> + }
> }
> }
>
> + /* Enable CABC if it needs to be enabled */

If it needs to be enabled?


> + rc = wled->wled_cabc_config(wled, true);
> + if (rc < 0)
> + goto failed_detect;
> +
> /* Restore the feedback setting */
> rc = regmap_write(wled->regmap,
> wled->ctrl_addr + WLED3_CTRL_REG_FEEDBACK_CONTROL, 0);
> @@ -570,29 +629,19 @@ static bool wled_auto_detection_required(struct wled *wled)
> static int wled_auto_detection_at_init(struct wled *wled)
> {
> int rc;
> - u32 fault_status, rt_status;
> + bool fault_set;
>
> if (!wled->cfg.auto_detection_enabled)
> return 0;
>
> - rc = regmap_read(wled->regmap,
> - wled->ctrl_addr + WLED3_CTRL_REG_INT_RT_STS,
> - &rt_status);
> + rc = wled->wled_ovp_fault_status(wled, &fault_set);
> if (rc < 0) {
> - dev_err(wled->dev, "Failed to read RT status rc=%d\n", rc);
> - return rc;
> - }
> -
> - rc = regmap_read(wled->regmap,
> - wled->ctrl_addr + WLED3_CTRL_REG_FAULT_STATUS,
> - &fault_status);
> - if (rc < 0) {
> - dev_err(wled->dev, "Failed to read fault status rc=%d\n", rc);
> + dev_err(wled->dev, "Error in getting OVP fault_sts, rc=%d\n",
> + rc);
> return rc;
> }
>
> - if ((rt_status & WLED3_CTRL_REG_OVP_FAULT_STATUS) ||
> - (fault_status & WLED3_CTRL_REG_OVP_FAULT_BIT)) {
> + if (fault_set) {
> mutex_lock(&wled->lock);
> wled_auto_string_detection(wled);
> mutex_unlock(&wled->lock);
> @@ -811,17 +860,12 @@ static int wled4_setup(struct wled *wled)
> wled->cfg.string_i_limit);
> if (rc < 0)
> return rc;
> -
> - addr = wled->sink_addr +
> - WLED4_SINK_REG_STR_CABC(j);
> - rc = regmap_update_bits(wled->regmap, addr,
> - WLED4_SINK_REG_STR_CABC_MASK,
> - wled->cfg.cabc ?
> - WLED4_SINK_REG_STR_CABC_MASK : 0);
> - if (rc < 0)
> - return rc;
> }
>
> + rc = wled4_cabc_config(wled, wled->cfg.en_cabc);
> + if (rc < 0)
> + return rc;
> +
> rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
> WLED3_CTRL_REG_MOD_EN,
> WLED3_CTRL_REG_MOD_EN_MASK,
> @@ -835,7 +879,7 @@ static int wled4_setup(struct wled *wled)
> if (rc < 0)
> return rc;
>
> - rc = wled_sync_toggle(wled);
> + rc = wled->wled_sync_toggle(wled);
> if (rc < 0) {
> dev_err(wled->dev, "Failed to toggle sync reg rc:%d\n", rc);
> return rc;
> @@ -951,7 +995,7 @@ static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
> return idx;
> }
>
> -static int wled_configure(struct wled *wled, int version)
> +static int wled_configure(struct wled *wled)
> {
> struct wled_config *cfg = &wled->cfg;
> struct device *dev = wled->dev;
> @@ -1035,12 +1079,13 @@ static int wled_configure(struct wled *wled, int version)
> if (rc)
> wled->name = devm_kasprintf(dev, GFP_KERNEL, "%pOFn", dev->of_node);
>
> - switch (version) {
> + switch (wled->version) {
> case 3:
> u32_opts = wled3_opts;
> size = ARRAY_SIZE(wled3_opts);
> *cfg = wled3_config_defaults;
> wled->wled_set_brightness = wled3_set_brightness;
> + wled->wled_sync_toggle = wled3_sync_toggle;
> wled->max_string_count = 3;
> wled->sink_addr = wled->ctrl_addr;
> break;
> @@ -1050,6 +1095,10 @@ static int wled_configure(struct wled *wled, int version)
> size = ARRAY_SIZE(wled4_opts);
> *cfg = wled4_config_defaults;
> wled->wled_set_brightness = wled4_set_brightness;
> + wled->wled_sync_toggle = wled3_sync_toggle;
> + wled->wled_cabc_config = wled4_cabc_config;
> + wled->wled_ovp_fault_status = wled4_ovp_fault_status;
> + wled->wled_ovp_delay = wled4_ovp_delay;
> wled->max_string_count = 4;
>
> prop_addr = of_get_address(dev->of_node, 1, NULL, NULL);
> @@ -1186,7 +1235,6 @@ static int wled_probe(struct platform_device *pdev)
> struct backlight_device *bl;
> struct wled *wled;
> struct regmap *regmap;
> - int version;
> u32 val;
> int rc;
>
> @@ -1203,18 +1251,18 @@ static int wled_probe(struct platform_device *pdev)
> wled->regmap = regmap;
> wled->dev = &pdev->dev;
>
> - version = (uintptr_t)of_device_get_match_data(&pdev->dev);
> - if (!version) {
> + wled->version = (uintptr_t)of_device_get_match_data(&pdev->dev);
> + if (!wled->version) {
> dev_err(&pdev->dev, "Unknown device version\n");
> return -ENODEV;
> }
>
> mutex_init(&wled->lock);
> - rc = wled_configure(wled, version);
> + rc = wled_configure(wled);
> if (rc)
> return rc;
>
> - switch (version) {
> + switch (wled->version) {
> case 3:
> wled->cfg.auto_detection_enabled = false;
> rc = wled3_setup(wled);
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project

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