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Message-ID: <c3wv3r44cmua2hphyjqzb7pp2a32pvs6svcj6s2zohp77qn3cr@4iica7j5bx5l>
Date: Fri, 20 Sep 2024 19:29:30 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Tejas Vipin <tejasvipin76@...il.com>
Cc: neil.armstrong@...aro.org, maarten.lankhorst@...ux.intel.com,
mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch,
quic_jesszhan@...cinc.com, dianders@...omium.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/panel: elida-kd35t133: transition to mipi_dsi
wrapped functions
On Tue, Sep 17, 2024 at 12:47:10PM GMT, Tejas Vipin wrote:
> Changes the elida-kd35t133 panel to use multi style functions for
> improved error handling.
>
> Signed-off-by: Tejas Vipin <tejasvipin76@...il.com>
> ---
> drivers/gpu/drm/panel/panel-elida-kd35t133.c | 107 ++++++++-----------
> 1 file changed, 45 insertions(+), 62 deletions(-)
>
> diff --git a/drivers/gpu/drm/panel/panel-elida-kd35t133.c b/drivers/gpu/drm/panel/panel-elida-kd35t133.c
> index 00791ea81e90..62abda9559e7 100644
> --- a/drivers/gpu/drm/panel/panel-elida-kd35t133.c
> +++ b/drivers/gpu/drm/panel/panel-elida-kd35t133.c
> @@ -50,55 +50,45 @@ static inline struct kd35t133 *panel_to_kd35t133(struct drm_panel *panel)
> return container_of(panel, struct kd35t133, panel);
> }
>
> -static int kd35t133_init_sequence(struct kd35t133 *ctx)
> +static void kd35t133_init_sequence(struct mipi_dsi_multi_context *dsi_ctx)
> {
> - struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> - struct device *dev = ctx->dev;
> -
> /*
> * Init sequence was supplied by the panel vendor with minimal
> * documentation.
> */
> - mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_POSITIVEGAMMA,
> - 0x00, 0x13, 0x18, 0x04, 0x0f, 0x06, 0x3a, 0x56,
> - 0x4d, 0x03, 0x0a, 0x06, 0x30, 0x3e, 0x0f);
> - mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_NEGATIVEGAMMA,
> - 0x00, 0x13, 0x18, 0x01, 0x11, 0x06, 0x38, 0x34,
> - 0x4d, 0x06, 0x0d, 0x0b, 0x31, 0x37, 0x0f);
> - mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL1, 0x18, 0x17);
> - mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL2, 0x41);
> - mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_VCOMCONTROL, 0x00, 0x1a, 0x80);
> - mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x48);
> - mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
> - mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_INTERFACEMODECTRL, 0x00);
> - mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_FRAMERATECTRL, 0xa0);
> - mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYINVERSIONCTRL, 0x02);
> - mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYFUNCTIONCTRL,
> - 0x20, 0x02);
> - mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_SETIMAGEFUNCTION, 0x00);
> - mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_ADJUSTCONTROL3,
> - 0xa9, 0x51, 0x2c, 0x82);
> - mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_INVERT_MODE, NULL, 0);
> -
> - dev_dbg(dev, "Panel init sequence done\n");
> - return 0;
> + mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_POSITIVEGAMMA,
> + 0x00, 0x13, 0x18, 0x04, 0x0f, 0x06, 0x3a, 0x56,
> + 0x4d, 0x03, 0x0a, 0x06, 0x30, 0x3e, 0x0f);
> + mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_NEGATIVEGAMMA,
> + 0x13, 0x18, 0x01, 0x11, 0x06, 0x38, 0x34,
> + 0x06, 0x0d, 0x0b, 0x31, 0x37, 0x0f);
> + mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_POWERCONTROL1, 0x18, 0x17);
> + mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_POWERCONTROL2, 0x41);
> + mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_VCOMCONTROL, 0x00, 0x1a, 0x80);
> + mipi_dsi_dcs_write_seq_multi(dsi_ctx, MIPI_DCS_SET_ADDRESS_MODE, 0x48);
> + mipi_dsi_dcs_write_seq_multi(dsi_ctx, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
> + mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_INTERFACEMODECTRL, 0x00);
> + mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_FRAMERATECTRL, 0xa0);
> + mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_DISPLAYINVERSIONCTRL, 0x02);
> + mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_DISPLAYFUNCTIONCTRL,
> + 0x02);
> + mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_SETIMAGEFUNCTION, 0x00);
> + mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_ADJUSTCONTROL3,
> + 0x51, 0x2c, 0x82);
> + if (!dsi_ctx->accum_err)
> + mipi_dsi_dcs_write(dsi_ctx->dsi, MIPI_DCS_ENTER_INVERT_MODE, NULL, 0);
Please use mipi_dsi_dcs_write_buffer_multi() instead.
> }
>
> static int kd35t133_unprepare(struct drm_panel *panel)
> {
> struct kd35t133 *ctx = panel_to_kd35t133(panel);
> struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> - int ret;
> + struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
>
> - ret = mipi_dsi_dcs_set_display_off(dsi);
> - if (ret < 0)
> - dev_err(ctx->dev, "failed to set display off: %d\n", ret);
> -
> - ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
> - if (ret < 0) {
> - dev_err(ctx->dev, "failed to enter sleep mode: %d\n", ret);
> - return ret;
> - }
> + mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
> + mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
> + if (dsi_ctx.accum_err)
> + return dsi_ctx.accum_err;
>
> gpiod_set_value_cansleep(ctx->reset_gpio, 1);
>
> @@ -112,18 +102,20 @@ static int kd35t133_prepare(struct drm_panel *panel)
> {
> struct kd35t133 *ctx = panel_to_kd35t133(panel);
> struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> - int ret;
> + struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
>
> dev_dbg(ctx->dev, "Resetting the panel\n");
> - ret = regulator_enable(ctx->vdd);
> - if (ret < 0) {
> - dev_err(ctx->dev, "Failed to enable vdd supply: %d\n", ret);
> - return ret;
> + dsi_ctx.accum_err = regulator_enable(ctx->vdd);
> + if (dsi_ctx.accum_err) {
> + dev_err(ctx->dev, "Failed to enable vdd supply: %d\n",
> + dsi_ctx.accum_err);
> + return dsi_ctx.accum_err;
> }
>
> - ret = regulator_enable(ctx->iovcc);
> - if (ret < 0) {
> - dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
> + dsi_ctx.accum_err = regulator_enable(ctx->iovcc);
> + if (dsi_ctx.accum_err) {
> + dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n",
> + dsi_ctx.accum_err);
> goto disable_vdd;
> }
>
> @@ -135,25 +127,16 @@ static int kd35t133_prepare(struct drm_panel *panel)
>
> msleep(20);
>
> - ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
> - if (ret < 0) {
> - dev_err(ctx->dev, "Failed to exit sleep mode: %d\n", ret);
> - goto disable_iovcc;
> - }
> + mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
> + mipi_dsi_msleep(&dsi_ctx, 250);
>
> - msleep(250);
> + kd35t133_init_sequence(&dsi_ctx);
> + if (!dsi_ctx.accum_err)
> + dev_dbg(ctx->dev, "Panel init sequence done\n");
>
> - ret = kd35t133_init_sequence(ctx);
> - if (ret < 0) {
> - dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret);
> + mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
> + if (dsi_ctx.accum_err)
> goto disable_iovcc;
> - }
Move this after the last mipi_dsi_msleep(), merge with the error
handling.
> -
> - ret = mipi_dsi_dcs_set_display_on(dsi);
> - if (ret < 0) {
> - dev_err(ctx->dev, "Failed to set display on: %d\n", ret);
> - goto disable_iovcc;
> - }
>
> msleep(50);
mipi_dsi_msleep()
>
> @@ -163,7 +146,7 @@ static int kd35t133_prepare(struct drm_panel *panel)
> regulator_disable(ctx->iovcc);
> disable_vdd:
> regulator_disable(ctx->vdd);
> - return ret;
> + return dsi_ctx.accum_err;
> }
>
> static const struct drm_display_mode default_mode = {
> --
> 2.46.0
>
--
With best wishes
Dmitry
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