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drm/bridge: ti-sn65dsi83: Check link status register after enabling the bridge

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In rare cases, the bridge may not start up correctly, which usually
leads to no display output. In case this happens, warn about it in
the kernel log.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Jagan Teki <jagan@amarulasolutions.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Robert Foss <robert.foss@linaro.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220213022648.495895-1-marex@denx.de
This commit is contained in:
Marek Vasut
2022-02-13 03:26:48 +01:00
committed by Robert Foss
parent 17a9c1aaa8
commit 85854fa959
1 changed files with 5 additions and 0 deletions
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drivers/gpu/drm/bridge/ti-sn65dsi83.c
+5
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@@ -488,6 +488,11 @@ static void sn65dsi83_atomic_enable(struct drm_bridge *bridge,
/* Clear all errors that got asserted during initialization. */
regmap_read(ctx->regmap, REG_IRQ_STAT, &pval);
regmap_write(ctx->regmap, REG_IRQ_STAT, pval);
usleep_range(10000, 12000);
regmap_read(ctx->regmap, REG_IRQ_STAT, &pval);
if (pval)
dev_err(ctx->dev, "Unexpected link status 0x%02x\n", pval);
}
static void sn65dsi83_atomic_disable(struct drm_bridge *bridge,