The S6E63M0 can emit an "ESD IRQ" which spells out electrostatic discharge interrupt request. This exist on other panels as well.

The interrupt will according to some sources occur as a result of the display being bent or cracked and generally failing to display the desired content.

I have no idea about how we should handle this IRQ, but the codebase for the Samsung GT-S7710 handles it by restarting the display controller pipeline, and possibly we should also bring the panel, bridge, and display controller down/up in response.

One idea I have is to broadcast a notifier so that the core can react to this in process context in response to this interrupt and restart the display pipeline. I.e. raw_notifier_call_chain().

Signed-off-by: Linus Walleij linus.walleij@linaro.org --- drivers/gpu/drm/panel/panel-samsung-s6e63m0.c | 22 +++++++++++++++++++ 1 file changed, 22 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c index 603c5dfe8768..5e4d2e8aa7a7 100644 --- a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c +++ b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c @@ -17,6 +17,8 @@ #include <linux/module.h> #include <linux/regulator/consumer.h> #include <linux/media-bus-format.h> +#include <linux/of_irq.h> +#include <linux/interrupt.h>

#include <video/mipi_display.h>

@@ -713,6 +715,18 @@ static int s6e63m0_backlight_register(struct s6e63m0 *ctx, u32 max_brightness) return ret; }

+static irqreturn_t s6e63m0_esd_irq(int irq, void *data) +{ + struct s6e63m0 *ctx = data; + + dev_info(ctx->dev, "ESD IRQ occurred\n"); + + /* Signal to the display controller to restart? */ + msleep(100); + + return IRQ_HANDLED; +} + int s6e63m0_probe(struct device *dev, int (*dcs_read)(struct device *dev, const u8 cmd, u8 *val), int (*dcs_write)(struct device *dev, const u8 *data, size_t len), @@ -720,6 +734,7 @@ int s6e63m0_probe(struct device *dev, { struct s6e63m0 *ctx; u32 max_brightness; + int irq; int ret;

ctx = devm_kzalloc(dev, sizeof(struct s6e63m0), GFP_KERNEL); @@ -758,6 +773,13 @@ int s6e63m0_probe(struct device *dev, return PTR_ERR(ctx->reset_gpio); }

+ irq = of_irq_get(dev->of_node, 0); + if (irq) { + ret = devm_request_threaded_irq(dev, irq, NULL, + s6e63m0_esd_irq, IRQF_ONESHOT, + "s6e63m0-esd", ctx); + } + drm_panel_init(&ctx->panel, dev, &s6e63m0_drm_funcs, dsi_mode ? DRM_MODE_CONNECTOR_DSI : DRM_MODE_CONNECTOR_DPI);