| Message ID | 1386268092-21719-5-git-send-email-denis@eukrea.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thursday, December 05, 2013 at 07:28:09 PM, Denis Carikli wrote: > 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"); I wonder, is this linebreak needed for this function call ? [...]
On Thu, Dec 05, 2013 at 07:28:09PM +0100, Denis Carikli wrote: [...] > diff --git a/drivers/staging/imx-drm/parallel-display.c b/drivers/staging/imx-drm/parallel-display.c [...] > @@ -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"); I don't think this is necessary. There is code in the regulator core nowadays that supplies a dummy regulator if one hasn't been hooked up in devicetree explicitly. So any error that you get at this point is likely a valid one rather than just a missing regulator. The advantage is that you no longer have to check at every step of the way that the regulator is valid before calling the regulator API. Thierry
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);
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(+)