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drm/sun4i: dsi: Use NULL to signify "no panel" 

The continued use of an ERR_PTR to signify "no panel" outside of
sun6i_dsi_attach is confusing because it is a double negative. Because
the connector always reports itself as connected, there is also the
possibility of sending an ERR_PTR to drm_panel_get_modes(), which would
crash.

Solve both of these by only storing the panel pointer if it is valid.

Fixes: 133add5b5a ("drm/sun4i: Add Allwinner A31 MIPI-DSI controller support")
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20200211072858.30784-2-samuel@sholland.org
This commit is contained in:
Samuel Holland 2020-02-11 01:28:56 -06:00 committed by Maxime Ripard
parent dc84f09151
commit 0e4e3fb490
No known key found for this signature in database
GPG Key ID: E3EF0D6F671851C5
1 changed files with 8 additions and 6 deletions
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14
drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
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@ -748,7 +748,7 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
phy_configure(dsi->dphy, &opts);
phy_power_on(dsi->dphy);
if (!IS_ERR(dsi->panel))
if (dsi->panel)
drm_panel_prepare(dsi->panel);
/*
@ -763,7 +763,7 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
* ordering on the panels I've tested it with, so I guess this
* will do for now, until that IP is better understood.
*/
if (!IS_ERR(dsi->panel))
if (dsi->panel)
drm_panel_enable(dsi->panel);
sun6i_dsi_start(dsi, DSI_START_HSC);
@ -779,7 +779,7 @@ static void sun6i_dsi_encoder_disable(struct drm_encoder *encoder)
DRM_DEBUG_DRIVER("Disabling DSI output\n");
if (!IS_ERR(dsi->panel)) {
if (dsi->panel) {
drm_panel_disable(dsi->panel);
drm_panel_unprepare(dsi->panel);
}
@ -941,11 +941,13 @@ static int sun6i_dsi_attach(struct mipi_dsi_host *host,
struct mipi_dsi_device *device)
{
struct sun6i_dsi *dsi = host_to_sun6i_dsi(host);
struct drm_panel *panel = of_drm_find_panel(device->dev.of_node);
if (IS_ERR(panel))
return PTR_ERR(panel);
dsi->panel = panel;
dsi->device = device;
dsi->panel = of_drm_find_panel(device->dev.of_node);
if (IS_ERR(dsi->panel))
return PTR_ERR(dsi->panel);
dev_info(host->dev, "Attached device %s\n", device->name);