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

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Date:   Mon, 4 Mar 2019 18:54:58 +0100
From:   Guido Günther <agx@...xcpu.org>
To:     Sam Ravnborg <sam@...nborg.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,
On Fri, Mar 01, 2019 at 11:39:06PM +0100, Sam Ravnborg wrote:
> 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>

Thanks! I made all the suggested changes in v3, on top of that I
prepended 'panel-rockteck-' to the driver name to be more consistent
with other drivers.
 -- Guido

> 
> 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
>