Cc: Dan Carpenter dan.carpenter@oracle.com Cc: Rob Herring rob.herring@calxeda.com Cc: Pawel Moll pawel.moll@arm.com Cc: Mark Rutland mark.rutland@arm.com Cc: Stephen Warren swarren@wwwdotorg.org Cc: Ian Campbell ijc+devicetree@hellion.org.uk Cc: devicetree@vger.kernel.org Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: driverdev-devel@linuxdriverproject.org Cc: David Airlie airlied@linux.ie Cc: dri-devel@lists.freedesktop.org Cc: Sascha Hauer kernel@pengutronix.de Cc: Shawn Guo shawn.guo@linaro.org Cc: linux-arm-kernel@lists.infradead.org Cc: Eric Bénard eric@eukrea.com Signed-off-by: Denis Carikli denis@eukrea.com --- ChangeLog v3->v5: - Code clenaup.
ChangeLog v2->v3: - Added some interested people in the Cc list. - the lcd-supply is now called display-supply (not all display are LCD). - The code and documentation was updated accordingly. - regulator_is_enabled now guard the regulator enables/disables because regulator_disable does not check the regulator state. --- .../bindings/staging/imx-drm/fsl-imx-drm.txt | 1 + drivers/staging/imx-drm/parallel-display.c | 22 ++++++++++++++++++++ 2 files changed, 23 insertions(+)
diff --git a/Documentation/devicetree/bindings/staging/imx-drm/fsl-imx-drm.txt b/Documentation/devicetree/bindings/staging/imx-drm/fsl-imx-drm.txt index 2d24425..4dd7ce5 100644 --- a/Documentation/devicetree/bindings/staging/imx-drm/fsl-imx-drm.txt +++ b/Documentation/devicetree/bindings/staging/imx-drm/fsl-imx-drm.txt @@ -28,6 +28,7 @@ Required properties: - compatible: Should be "fsl,imx-parallel-display" - crtc: the crtc this display is connected to, see below Optional properties: +- display-supply : phandle to the regulator device tree node if needed. - interface_pix_fmt: How this display is connected to the crtc. Currently supported types: "rgb24", "rgb565", "bgr666", "rgb666" - edid: verbatim EDID data block describing attached display. diff --git a/drivers/staging/imx-drm/parallel-display.c b/drivers/staging/imx-drm/parallel-display.c index 65d0c18..61c0aeb 100644 --- a/drivers/staging/imx-drm/parallel-display.c +++ b/drivers/staging/imx-drm/parallel-display.c @@ -22,6 +22,7 @@ #include <drm/drmP.h> #include <drm/drm_fb_helper.h> #include <drm/drm_crtc_helper.h> +#include <linux/regulator/consumer.h> #include <linux/videodev2.h>
#include "imx-drm.h" @@ -35,6 +36,7 @@ struct imx_parallel_display { struct drm_encoder encoder; struct imx_drm_encoder *imx_drm_encoder; struct device *dev; + struct regulator *disp_reg; void *edid; int edid_len; u32 interface_pix_fmt; @@ -141,6 +143,13 @@ static void imx_pd_encoder_prepare(struct drm_encoder *encoder) { struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
+ if (!IS_ERR(imxpd->disp_reg) && + !regulator_is_enabled(imxpd->disp_reg)) { + if (regulator_enable(imxpd->disp_reg)) + dev_err(imxpd->dev, + "Failed to enable regulator.\n"); + } + imx_drm_crtc_panel_format(encoder->crtc, DRM_MODE_ENCODER_NONE, imxpd->interface_pix_fmt); } @@ -157,6 +166,12 @@ static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
static void imx_pd_encoder_disable(struct drm_encoder *encoder) { + struct imx_parallel_display *imxpd = enc_to_imxpd(encoder); + + if (!IS_ERR(imxpd->disp_reg) && regulator_is_enabled(imxpd->disp_reg)) { + if (regulator_disable(imxpd->disp_reg)) + dev_err(imxpd->dev, "Failed to disable regulator.\n"); + } }
static void imx_pd_encoder_destroy(struct drm_encoder *encoder) @@ -260,6 +275,13 @@ static int imx_pd_probe(struct platform_device *pdev) if (ret) return ret;
+ imxpd->disp_reg = devm_regulator_get(&pdev->dev, "display"); + if (PTR_ERR(imxpd->disp_reg) == -EPROBE_DEFER) + return -EPROBE_DEFER; + + if (IS_ERR(imxpd->disp_reg)) + dev_dbg(&pdev->dev, "Operating without display regulator.\n"); + ret = imx_drm_encoder_add_possible_crtcs(imxpd->imx_drm_encoder, np);
platform_set_drvdata(pdev, imxpd);