Re: [PATCH V4 6/8] backlight: qcom-wled: Add support for WLED4 peripheral

Daniel Thompson
2018-07-20T13:47:27Z

On 09/07/18 11:22, Kiran Gunda wrote:
> WLED4 peripheral is present on some PMICs like pmi8998 and
> pm660l. It has a different register map and configurations
> are also different. Add support for it.
>
> Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
> ---
> Changes from V3:
> - The WLED3 specific changes are splitted out
> - Merged the wled3_sync_toggle and wled4_syn_toggle functions
> - Modified the compatible .data
> - Moved from if/else to switch/case to select the version specific data
> - Addressed few more minor comments from Bjorn
>
> drivers/video/backlight/qcom-wled.c | 264 +++++++++++++++++++++++++++++++++++-
> 1 file changed, 258 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
> index 87fc1d0..362d254 100644
> --- a/drivers/video/backlight/qcom-wled.c
> +++ b/drivers/video/backlight/qcom-wled.c
> @@ -64,6 +64,28 @@
> #define WLED3_SINK_REG_STR_CABC(n) (0x66 + (n * 0x10))
> #define WLED3_SINK_REG_STR_CABC_MASK BIT(7)
>
> +/* WLED4 specific sink registers */
> +#define WLED4_SINK_REG_CURR_SINK 0x46
> +#define WLED4_SINK_REG_CURR_SINK_MASK GENMASK(7, 4)
> +#define WLED4_SINK_REG_CURR_SINK_SHFT 4
> +
> +/* WLED4 specific per-'string' registers below */
> +#define WLED4_SINK_REG_STR_MOD_EN(n) (0x50 + (n * 0x10))
> +#define WLED4_SINK_REG_STR_MOD_MASK BIT(7)
> +
> +#define WLED4_SINK_REG_STR_FULL_SCALE_CURR(n) (0x52 + (n * 0x10))
> +#define WLED4_SINK_REG_STR_FULL_SCALE_CURR_MASK GENMASK(3, 0)
> +
> +#define WLED4_SINK_REG_STR_MOD_SRC(n) (0x53 + (n * 0x10))
> +#define WLED4_SINK_REG_STR_MOD_SRC_MASK BIT(0)
> +#define WLED4_SINK_REG_STR_MOD_SRC_INT 0x00
> +#define WLED4_SINK_REG_STR_MOD_SRC_EXT 0x01
> +
> +#define WLED4_SINK_REG_STR_CABC(n) (0x56 + (n * 0x10))
> +#define WLED4_SINK_REG_STR_CABC_MASK BIT(7)
> +
> +#define WLED4_SINK_REG_BRIGHT(n) (0x57 + (n * 0x10))
> +
> struct wled_var_cfg {
> const u32 *values;
> u32 (*fn)(u32);
> @@ -98,6 +120,7 @@ struct wled {
> struct device *dev;
> struct regmap *regmap;
> u16 ctrl_addr;
> + u16 sink_addr;
> u16 max_string_count;
> u32 brightness;
> u32 max_brightness;
> @@ -124,6 +147,29 @@ static int wled3_set_brightness(struct wled *wled, u16 brightness)
> return 0;
> }
>
> +static int wled4_set_brightness(struct wled *wled, u16 brightness)
> +{
> + int rc, i;
> + u16 low_limit = wled->max_brightness * 4 / 1000;
> + u8 v[2];
> +
> + /* WLED4's lower limit of operation is 0.4% */
> + if (brightness > 0 && brightness < low_limit)
> + brightness = low_limit;
> +
> + v[0] = brightness & 0xff;
> + v[1] = (brightness >> 8) & 0xf;
> +
> + for (i = 0; i < wled->cfg.num_strings; ++i) {
> + rc = regmap_bulk_write(wled->regmap, wled->sink_addr +
> + WLED4_SINK_REG_BRIGHT(i), v, 2);
> + if (rc < 0)
> + return rc;
> + }
> +
> + return 0;
> +}
> +
> static int wled_module_enable(struct wled *wled, int val)
> {
> int rc;
> @@ -141,13 +187,13 @@ static int wled_sync_toggle(struct wled *wled)
> unsigned int mask = GENMASK(wled->max_string_count - 1, 0);
>
> rc = regmap_update_bits(wled->regmap,
> - wled->ctrl_addr + WLED_SINK_REG_SYNC,
> + wled->sink_addr + WLED_SINK_REG_SYNC,
> mask, mask);
> if (rc < 0)
> return rc;
>
> rc = regmap_update_bits(wled->regmap,
> - wled->ctrl_addr + WLED_SINK_REG_SYNC,
> + wled->sink_addr + WLED_SINK_REG_SYNC,
> mask, WLED_SINK_REG_SYNC_CLEAR);
>
> return rc;
> @@ -274,6 +320,120 @@ static int wled3_setup(struct wled *wled)
> .cabc = false,
> };
>
> +static int wled4_setup(struct wled *wled)
> +{
> + int rc, temp, i, j;
> + u16 addr;
> + u8 sink_en = 0;
> + u32 sink_cfg = 0;
> +
> + rc = regmap_update_bits(wled->regmap,
> + wled->ctrl_addr + WLED_CTRL_REG_OVP,
> + WLED_CTRL_REG_OVP_MASK, wled->cfg.ovp);
> + if (rc < 0)
> + return rc;
> +
> + rc = regmap_update_bits(wled->regmap,
> + wled->ctrl_addr + WLED_CTRL_REG_ILIMIT,
> + WLED_CTRL_REG_ILIMIT_MASK,
> + wled->cfg.boost_i_limit);
> + if (rc < 0)
> + return rc;
> +
> + rc = regmap_update_bits(wled->regmap,
> + wled->ctrl_addr + WLED_CTRL_REG_FREQ,
> + WLED_CTRL_REG_FREQ_MASK,
> + wled->cfg.switch_freq);
> + if (rc < 0)
> + return rc;
> +
> + rc = regmap_read(wled->regmap, wled->sink_addr +
> + WLED4_SINK_REG_CURR_SINK, &sink_cfg);
> + if (rc < 0)
> + return rc;
> +
> + for (i = 0; i < wled->cfg.num_strings; i++) {
> + j = wled->cfg.enabled_strings[i];
> + temp = j + WLED4_SINK_REG_CURR_SINK_SHFT;
> + sink_en |= 1 << temp;
> + }
> +
> + if (sink_cfg == sink_en)
> + return 0;
> +
> + rc = regmap_update_bits(wled->regmap,
> + wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
> + WLED4_SINK_REG_CURR_SINK_MASK, 0);
> + if (rc < 0)
> + return rc;
> +
> + rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
> + WLED_CTRL_REG_MOD_EN,
> + WLED_CTRL_REG_MOD_EN_MASK, 0);
> + if (rc < 0)
> + return rc;
> +
> + /* Per sink/string configuration */
> + for (i = 0; i < wled->cfg.num_strings; i++) {
> + j = wled->cfg.enabled_strings[i];
> +
> + addr = wled->sink_addr +
> + WLED4_SINK_REG_STR_MOD_EN(j);
> + rc = regmap_update_bits(wled->regmap, addr,
> + WLED4_SINK_REG_STR_MOD_MASK,
> + WLED4_SINK_REG_STR_MOD_MASK);
> + if (rc < 0)
> + return rc;
> +
> + addr = wled->sink_addr +
> + WLED4_SINK_REG_STR_FULL_SCALE_CURR(j);
> + rc = regmap_update_bits(wled->regmap, addr,
> + WLED4_SINK_REG_STR_FULL_SCALE_CURR_MASK,
> + 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 = regmap_update_bits(wled->regmap, wled->ctrl_addr +
> + WLED_CTRL_REG_MOD_EN,
> + WLED_CTRL_REG_MOD_EN_MASK,
> + WLED_CTRL_REG_MOD_EN_MASK);
> + if (rc < 0)
> + return rc;
> +
> + rc = regmap_update_bits(wled->regmap,
> + wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
> + WLED4_SINK_REG_CURR_SINK_MASK, sink_en);
> + if (rc < 0)
> + return rc;
> +
> + rc = wled_sync_toggle(wled);
> + if (rc < 0) {
> + dev_err(wled->dev, "Failed to toggle sync reg rc:%d\n", rc);
> + return rc;
> + }
> +
> + return 0;
> +}
> +
> +static const struct wled_config wled4_config_defaults = {
> + .boost_i_limit = 4,
> + .string_i_limit = 10,
> + .ovp = 1,
> + .num_strings = 4,
> + .switch_freq = 11,
> + .cabc = false,
> +};
> +
> static const u32 wled3_boost_i_limit_values[] = {
> 105, 385, 525, 805, 980, 1260, 1400, 1680,
> };
> @@ -283,6 +443,15 @@ static int wled3_setup(struct wled *wled)
> .size = ARRAY_SIZE(wled3_boost_i_limit_values),
> };
>
> +static const u32 wled4_boost_i_limit_values[] = {
> + 105, 280, 450, 620, 970, 1150, 1300, 1500,
> +};
> +
> +static const struct wled_var_cfg wled4_boost_i_limit_cfg = {
> + .values = wled4_boost_i_limit_values,
> + .size = ARRAY_SIZE(wled4_boost_i_limit_values),
> +};
> +
> static const u32 wled3_ovp_values[] = {
> 35, 32, 29, 27,
> };
> @@ -292,6 +461,15 @@ static int wled3_setup(struct wled *wled)
> .size = ARRAY_SIZE(wled3_ovp_values),
> };
>
> +static const u32 wled4_ovp_values[] = {
> + 31100, 29600, 19600, 18100,
> +};
> +
> +static const struct wled_var_cfg wled4_ovp_cfg = {
> + .values = wled4_ovp_values,
> + .size = ARRAY_SIZE(wled4_ovp_values),
> +};
> +
> static u32 wled3_num_strings_values_fn(u32 idx)
> {
> return idx + 1;
> @@ -302,6 +480,11 @@ static u32 wled3_num_strings_values_fn(u32 idx)
> .size = 3,
> };
>
> +static const struct wled_var_cfg wled4_num_strings_cfg = {
> + .fn = wled3_num_strings_values_fn,
> + .size = 4,
> +};
> +
> static u32 wled3_switch_freq_values_fn(u32 idx)
> {
> return 19200 / (2 * (1 + idx));
> @@ -316,10 +499,24 @@ static u32 wled3_switch_freq_values_fn(u32 idx)
> .size = 26,
> };
>
> +static const u32 wled4_string_i_limit_values[] = {
> + 0, 2500, 5000, 7500, 10000, 12500, 15000, 17500, 20000,
> + 22500, 25000, 27500, 30000,
> +};
> +
> +static const struct wled_var_cfg wled4_string_i_limit_cfg = {
> + .values = wled4_string_i_limit_values,
> + .size = ARRAY_SIZE(wled4_string_i_limit_values),
> +};
> +
> static const struct wled_var_cfg wled3_string_cfg = {
> .size = 8,
> };
>
> +static const struct wled_var_cfg wled4_string_cfg = {
> + .size = 16,
> +};
> +
> static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
> {
> if (idx >= cfg->size)
> @@ -332,6 +529,7 @@ static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
> }
>
> #define WLED3 3
> +#define WLED4 4

Are these macros always going to define 3 to be 3 and 4 to be 4. If so
we probably don't need them (and they should be removed from patch 5/8 too).

There is a degree of nitpicking here however. The rest looks OK to me.

Daniel.
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