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SubjectRe: [PATCH v2 2/2] drm/panel: Add support for Raydium RM67191 panel driver
On Tue, Jun 18, 2019 at 04:30:46PM +0300, Robert Chiras wrote:
> This patch adds Raydium RM67191 TFT LCD panel driver (MIPI-DSI
> protocol).
>
> Signed-off-by: Robert Chiras <robert.chiras@nxp.com>
Please include in the changelog a list of what was updated - like this:

v2:
- added kconif symbol sorted (sam)
- another nitpick (foo)
- etc

In general try to namme who gave feedback to give them some credit.

Who is maintainer for this onwards?

> ---
> drivers/gpu/drm/panel/Kconfig | 9 +
> drivers/gpu/drm/panel/Makefile | 1 +
> drivers/gpu/drm/panel/panel-raydium-rm67191.c | 709 ++++++++++++++++++++++++++
> 3 files changed, 719 insertions(+)
> create mode 100644 drivers/gpu/drm/panel/panel-raydium-rm67191.c
>
> +static int rad_panel_prepare(struct drm_panel *panel)
> +{
> + struct rad_panel *rad = to_rad_panel(panel);
> +
> + if (rad->prepared)
> + return 0;
> +
> + if (rad->reset) {
> + gpiod_set_value_cansleep(rad->reset, 1);
> + usleep_range(3000, 5000);
> + gpiod_set_value_cansleep(rad->reset, 0);

So writing a 0 will release reset.
> + usleep_range(18000, 20000);
> + }
> +
> + rad->prepared = true;
> +
> + return 0;
> +}
> +
> +static int rad_panel_unprepare(struct drm_panel *panel)
> +{
> + struct rad_panel *rad = to_rad_panel(panel);
> +
> + if (!rad->prepared)
> + return 0;
> +
> + if (rad->reset) {
> + gpiod_set_value_cansleep(rad->reset, 1);
> + usleep_range(15000, 17000);
> + gpiod_set_value_cansleep(rad->reset, 0);
Looks strange that reset is released in unprepare.
I would expect it to stay reset to minimize power etc.

> +
> + ret = drm_display_info_set_bus_formats(&connector->display_info,
> + rad_bus_formats,
> + ARRAY_SIZE(rad_bus_formats));

Other drivers has this as the last stement in their enable function.
I did not check why, but maybe something to invest a few minutes into.
Be different only if there is a reason to do so.

> + if (ret)
> + return ret;
> +
> + drm_mode_probed_add(panel->connector, mode);
> +
> + return 1;
> +}
> +
> +
> +#ifdef CONFIG_PM
> +static int rad_panel_suspend(struct device *dev)
> +{
> + struct rad_panel *rad = dev_get_drvdata(dev);
> +
> + if (!rad->reset)
> + return 0;
> +
> + devm_gpiod_put(dev, rad->reset);
> + rad->reset = NULL;
> +
> + return 0;
> +}
> +
> +static int rad_panel_resume(struct device *dev)
> +{
> + struct rad_panel *rad = dev_get_drvdata(dev);
> +
> + if (rad->reset)
> + return 0;
> +
> + rad->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> + if (IS_ERR(rad->reset))
> + rad->reset = NULL;
> +
> + return PTR_ERR_OR_ZERO(rad->reset);
> +}
> +
> +#endif

Use __maybe_unused for the tw functions above.
And loose the ifdef...

> +
> +static const struct dev_pm_ops rad_pm_ops = {
> + SET_RUNTIME_PM_OPS(rad_panel_suspend, rad_panel_resume, NULL)
> + SET_SYSTEM_SLEEP_PM_OPS(rad_panel_suspend, rad_panel_resume)
> +};
> +
> +static const struct of_device_id rad_of_match[] = {
> + { .compatible = "raydium,rm67191", },
> + { }
We often, but not always, write this as { /* sentinal */ },

> +};
> +MODULE_DEVICE_TABLE(of, rad_of_match);
> +
> +static struct mipi_dsi_driver rad_panel_driver = {
> + .driver = {
> + .name = "panel-raydium-rm67191",
> + .of_match_table = rad_of_match,
> + .pm = &rad_pm_ops,
> + },
> + .probe = rad_panel_probe,
> + .remove = rad_panel_remove,
> + .shutdown = rad_panel_shutdown,
> +};
> +module_mipi_dsi_driver(rad_panel_driver);
> +
> +MODULE_AUTHOR("Robert Chiras <robert.chiras@nxp.com>");
> +MODULE_DESCRIPTION("DRM Driver for Raydium RM67191 MIPI DSI panel");
> +MODULE_LICENSE("GPL v2");

With the above trivialities considered/fixed:
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>

Sam

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