On Wed, 14 Dec 2022 at 14:01, Paul Cercueil <paul@xxxxxxxxxxxxxxx> wrote:
>
> Add support for the IT6610 HDMI encoder.
>
> The hardware is very similar, and therefore the driver did not require
> too many changes. Some bits are only available on the IT66121, and
> vice-versa. Also, the IT6610 requires specific polarities on the DE and
> pixel lines.
>
> Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/bridge/ite-it66121.c | 108 +++++++++++++++++++++------
> 1 file changed, 86 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c
> index 43b027b85b8e..b34860871627 100644
> --- a/drivers/gpu/drm/bridge/ite-it66121.c
> +++ b/drivers/gpu/drm/bridge/ite-it66121.c
> @@ -68,6 +68,7 @@
> #define IT66121_AFE_XP_ENO BIT(4)
> #define IT66121_AFE_XP_RESETB BIT(3)
> #define IT66121_AFE_XP_PWDI BIT(2)
> +#define IT6610_AFE_XP_BYPASS BIT(0)
>
> #define IT66121_AFE_IP_REG 0x64
> #define IT66121_AFE_IP_GAINBIT BIT(7)
> @@ -284,7 +285,13 @@
>
> #define IT66121_AFE_CLK_HIGH 80000 /* Khz */
>
> +enum chip_id {
> + ID_IT6610,
> + ID_IT66121,
> +};
> +
> struct it66121_chip_info {
> + enum chip_id id;
> u16 vid, pid;
> };
>
> @@ -391,16 +398,22 @@ static int it66121_configure_afe(struct it66121_ctx *ctx,
>
> ret = regmap_write_bits(ctx->regmap, IT66121_AFE_IP_REG,
> IT66121_AFE_IP_GAINBIT |
> - IT66121_AFE_IP_ER0 |
> - IT66121_AFE_IP_EC1,
> + IT66121_AFE_IP_ER0,
> IT66121_AFE_IP_GAINBIT);
> if (ret)
> return ret;
>
> - ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_EC1_REG,
> - IT66121_AFE_XP_EC1_LOWCLK, 0x80);
> - if (ret)
> - return ret;
> + if (ctx->info->id == ID_IT66121) {
> + ret = regmap_write_bits(ctx->regmap, IT66121_AFE_IP_REG,
> + IT66121_AFE_IP_EC1, 0);
> + if (ret)
> + return ret;
> +
> + ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_EC1_REG,
> + IT66121_AFE_XP_EC1_LOWCLK, 0x80);
> + if (ret)
> + return ret;
> + }
> } else {
> ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_REG,
> IT66121_AFE_XP_GAINBIT |
> @@ -411,17 +424,24 @@ static int it66121_configure_afe(struct it66121_ctx *ctx,
>
> ret = regmap_write_bits(ctx->regmap, IT66121_AFE_IP_REG,
> IT66121_AFE_IP_GAINBIT |
> - IT66121_AFE_IP_ER0 |
> - IT66121_AFE_IP_EC1, IT66121_AFE_IP_ER0 |
> - IT66121_AFE_IP_EC1);
> + IT66121_AFE_IP_ER0,
> + IT66121_AFE_IP_ER0);
> if (ret)
> return ret;
>
> - ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_EC1_REG,
> - IT66121_AFE_XP_EC1_LOWCLK,
> - IT66121_AFE_XP_EC1_LOWCLK);
> - if (ret)
> - return ret;
> + if (ctx->info->id == ID_IT66121) {
> + ret = regmap_write_bits(ctx->regmap, IT66121_AFE_IP_REG,
> + IT66121_AFE_IP_EC1,
> + IT66121_AFE_IP_EC1);
> + if (ret)
> + return ret;
> +
> + ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_EC1_REG,
> + IT66121_AFE_XP_EC1_LOWCLK,
> + IT66121_AFE_XP_EC1_LOWCLK);
> + if (ret)
> + return ret;
> + }
> }
>
> /* Clear reset flags */
> @@ -430,6 +450,14 @@ static int it66121_configure_afe(struct it66121_ctx *ctx,
> if (ret)
> return ret;
>
> + if (ctx->info->id == ID_IT6610) {
> + ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_REG,
> + IT6610_AFE_XP_BYPASS,
> + IT6610_AFE_XP_BYPASS);
> + if (ret)
> + return ret;
> + }
> +
> return it66121_fire_afe(ctx);
> }
>
> @@ -491,7 +519,6 @@ static int it66121_get_edid_block(void *context, u8 *buf,
> unsigned int block, size_t len)
> {
> struct it66121_ctx *ctx = context;
> - unsigned int val;
> int remain = len;
> int offset = 0;
> int ret, cnt;
> @@ -572,10 +599,12 @@ static int it66121_bridge_attach(struct drm_bridge *bridge,
> if (ret)
> return ret;
>
> - ret = regmap_write_bits(ctx->regmap, IT66121_CLK_BANK_REG,
> - IT66121_CLK_BANK_PWROFF_RCLK, 0);
> - if (ret)
> - return ret;
> + if (ctx->info->id == ID_IT66121) {
> + ret = regmap_write_bits(ctx->regmap, IT66121_CLK_BANK_REG,
> + IT66121_CLK_BANK_PWROFF_RCLK, 0);
> + if (ret)
> + return ret;
> + }
>
> ret = regmap_write_bits(ctx->regmap, IT66121_INT_REG,
> IT66121_INT_TX_CLK_OFF, 0);
> @@ -713,6 +742,24 @@ static void it66121_bridge_disable(struct drm_bridge *bridge,
> ctx->connector = NULL;
> }
>
> +static int it66121_bridge_check(struct drm_bridge *bridge,
> + struct drm_bridge_state *bridge_state,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state)
> +{
> + struct it66121_ctx *ctx = container_of(bridge, struct it66121_ctx, bridge);
> +
> + if (ctx->info->id == ID_IT6610) {
> + /* The IT6610 only supports these settings */
> + bridge_state->input_bus_cfg.flags |= DRM_BUS_FLAG_DE_HIGH |
> + DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
> + bridge_state->input_bus_cfg.flags &=
> + ~DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
> + }
> +
> + return 0;
> +}
> +
> static
> void it66121_bridge_mode_set(struct drm_bridge *bridge,
> const struct drm_display_mode *mode,
> @@ -758,9 +805,12 @@ void it66121_bridge_mode_set(struct drm_bridge *bridge,
> if (regmap_write(ctx->regmap, IT66121_HDMI_MODE_REG, IT66121_HDMI_MODE_HDMI))
> goto unlock;
>
> - if (regmap_write_bits(ctx->regmap, IT66121_CLK_BANK_REG,
> - IT66121_CLK_BANK_PWROFF_TXCLK, IT66121_CLK_BANK_PWROFF_TXCLK))
> + if (ctx->info->id == ID_IT66121 &&
> + regmap_write_bits(ctx->regmap, IT66121_CLK_BANK_REG,
> + IT66121_CLK_BANK_PWROFF_TXCLK,
> + IT66121_CLK_BANK_PWROFF_TXCLK)) {
> goto unlock;
> + }
>
> if (it66121_configure_input(ctx))
> goto unlock;
> @@ -768,7 +818,11 @@ void it66121_bridge_mode_set(struct drm_bridge *bridge,
> if (it66121_configure_afe(ctx, adjusted_mode))
> goto unlock;
>
> - regmap_write_bits(ctx->regmap, IT66121_CLK_BANK_REG, IT66121_CLK_BANK_PWROFF_TXCLK, 0);
> + if (ctx->info->id == ID_IT66121 &&
> + regmap_write_bits(ctx->regmap, IT66121_CLK_BANK_REG,
> + IT66121_CLK_BANK_PWROFF_TXCLK, 0)) {
> + goto unlock;
> + }
>
> unlock:
> mutex_unlock(&ctx->lock);
> @@ -859,6 +913,7 @@ static const struct drm_bridge_funcs it66121_bridge_funcs = {
> .atomic_get_input_bus_fmts = it66121_bridge_atomic_get_input_bus_fmts,
> .atomic_enable = it66121_bridge_enable,
> .atomic_disable = it66121_bridge_disable,
> + .atomic_check = it66121_bridge_check,
> .mode_set = it66121_bridge_mode_set,
> .mode_valid = it66121_bridge_mode_valid,
> .detect = it66121_bridge_detect,
> @@ -1557,17 +1612,26 @@ static void it66121_remove(struct i2c_client *client)
>
> static const struct of_device_id it66121_dt_match[] = {
> { .compatible = "ite,it66121" },
> + { .compatible = "ite,it6610" },
> { }
> };
> MODULE_DEVICE_TABLE(of, it66121_dt_match);
>
> static const struct it66121_chip_info it66121_chip_info = {
> + .id = ID_IT66121,
> .vid = 0x4954,
> .pid = 0x0612,
> };
>
> +static const struct it66121_chip_info it6610_chip_info = {
> + .id = ID_IT6610,
> + .vid = 0xca00,
> + .pid = 0x0611,
> +};
> +
> static const struct i2c_device_id it66121_id[] = {
> { "it66121", (kernel_ulong_t) &it66121_chip_info },
> + { "it6610", (kernel_ulong_t) &it6610_chip_info },
> { }
> };
> MODULE_DEVICE_TABLE(i2c, it66121_id);
> --
> 2.35.1
>
Reviewed-by: Robert Foss <robert.foss@xxxxxxxxxx>
