linux-kernel - Re: [PATCH v2 3/3] drm/panel: Add Rocktech jh057n00900 panel driver

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Message-ID: <20190301223906.GB30998@ravnborg.org>
Date:   Fri, 1 Mar 2019 23:39:06 +0100
From:   Sam Ravnborg <sam@...nborg.org>
To:     Guido Günther <agx@...xcpu.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 3/3] drm/panel: Add Rocktech jh057n00900 panel driver

Hi Guido.

Thanks for addressing review comments in first round.
Just a few nits in this follow-up.
With these nits addressed:
Reviewed-by: Sam Ravnborg <sam@...nborg.org>

On Fri, Mar 01, 2019 at 02:02:04PM +0100, Guido Günther wrote:

> +#include <video/display_timing.h>
This include file is, as far as I could tell, no longer used and can be dropped.

> +
> +static int jh057n_get_modes(struct drm_panel *panel)
> +{
> +	struct drm_display_mode *mode;
> +
> +	mode = drm_mode_duplicate(panel->drm, &default_mode);
> +	if (!mode) {
> +		DRM_ERROR("Failed to add mode %ux%u@%u",
> +			  default_mode.hdisplay, default_mode.vdisplay,
> +			  default_mode.vrefresh);
> +		return -ENOMEM;
Use DRM_DEV_ERROR()
You can find dev via: panel->base.drm-dev

> +
> +static int jh057n_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct device *dev = &dsi->dev;
> +	struct jh057n *ctx;
> +	int ret;
> +
> +	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> +	if (IS_ERR(ctx->reset_gpio)) {
> +		DRM_DEV_ERROR(dev, "cannot get reset gpio");
> +		return PTR_ERR(ctx->reset_gpio);
> +	}
> +
> +	mipi_dsi_set_drvdata(dsi, ctx);
> +
> +	ctx->dev = dev;
> +
> +	dsi->lanes = 4;
> +	dsi->format = MIPI_DSI_FMT_RGB888;
> +	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
> +		MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
> +
> +	ctx->backlight = devm_of_find_backlight(dev);
> +	if (IS_ERR(ctx->backlight))
> +		return PTR_ERR(ctx->backlight);
> +
> +	drm_panel_init(&ctx->panel);
> +	ctx->panel.dev = dev;
> +	ctx->panel.funcs = &jh057n_drm_funcs;
> +
> +	drm_panel_add(&ctx->panel);
> +
> +	ret = mipi_dsi_attach(dsi);
> +	if (ret < 0) {
> +		DRM_DEV_ERROR(dev, "mipi_dsi_attach failed. Is host ready?");
> +		drm_panel_remove(&ctx->panel);
> +		return ret;
> +	}
> +
> +	DRM_INFO(DRV_NAME "_panel %ux%u@%u %ubpp dsi %udl - ready",
> +		 default_mode.hdisplay, default_mode.vdisplay,
> +		 default_mode.vrefresh,
> +		 mipi_dsi_pixel_format_to_bpp(dsi->format), dsi->lanes);

You already have dev, so use DRM_DEV_INFO() and drop DRV_NAME

> +
> +static const struct of_device_id jh057n_of_match[] = {
> +	{ .compatible = "rocktech,jh057n00900" },
> +	{ /* Sentinel */ }
Lower case 's' (sorry, likely my bad)

> +	.probe	= jh057n_probe,
> +	.remove = jh057n_remove,
> +	.shutdown = jh057n_shutdown,
> +	.driver = {
> +		.name = DRV_NAME "_panel",
Drop "_panel" postfix. Other drivers do not use it.

	Sam