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drm/panel: boe-tv101wum-nl6: Check for errors on the NOP in prepare()

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[ Upstream commit 6320b9199d ]

The mipi_dsi_dcs_nop() function returns an error but we weren't
checking it in boe_panel_prepare(). Add a check. This is highly
unlikely to matter in practice. If the NOP failed then likely later
MIPI commands would fail too.

Found by code inspection.

Fixes: 812562b8d8 ("drm/panel: boe-tv101wum-nl6: Fine tune the panel power sequence")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20240517143643.3.Ibffbaa5b4999ac0e55f43bf353144433b099d727@changeid
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240517143643.3.Ibffbaa5b4999ac0e55f43bf353144433b099d727@changeid
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Douglas Anderson 2024-05-17 14:36:38 -07:00 committed by Greg Kroah-Hartman
parent 93296c2527
commit c9bec33bd4
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
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@ -1847,7 +1847,11 @@ static int boe_panel_prepare(struct drm_panel *panel)
usleep_range(10000, 11000);
if (boe->desc->lp11_before_reset) {
mipi_dsi_dcs_nop(boe->dsi);
ret = mipi_dsi_dcs_nop(boe->dsi);
if (ret < 0) {
dev_err(&boe->dsi->dev, "Failed to send NOP: %d\n", ret);
goto poweroff;
}
usleep_range(1000, 2000);
}
gpiod_set_value(boe->enable_gpio, 1);