| Message ID | 20190906135436.10622-6-jacopo+renesas@jmondi.org (mailing list archive) |
|---|---|
| State | New |
| Delegated to: | Kieran Bingham |
| Headers | show |
| Series | [v4,1/9] dt-bindings: display: renesas,cmm: Add R-Car CMM documentation | expand |
Hi Jacopo, On 06/09/2019 14:54, Jacopo Mondi wrote: > Implement device tree parsing to collect the available CMM instances > described by the 'renesas,cmms' property. Associate CMMs with CRTCs and > store a mask of active CMMs in the DU group for later enablement. > > Enforce the probe and suspend/resume ordering of DU and CMM by creating > a stateless device link between the two. > > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> > --- > drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 6 +++ > drivers/gpu/drm/rcar-du/rcar_du_crtc.h | 2 + > drivers/gpu/drm/rcar-du/rcar_du_drv.h | 2 + > drivers/gpu/drm/rcar-du/rcar_du_group.h | 2 + > drivers/gpu/drm/rcar-du/rcar_du_kms.c | 68 +++++++++++++++++++++++++ > 5 files changed, 80 insertions(+) > > diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c > index 2da46e3dc4ae..23f1d6cc1719 100644 > --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c > +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c > @@ -1194,6 +1194,12 @@ int rcar_du_crtc_create(struct rcar_du_group *rgrp, unsigned int swindex, > if (ret < 0) > return ret; > > + /* CMM might be disabled for this CRTC. */ > + if (rcdu->cmms[swindex]) { > + rcrtc->cmm = rcdu->cmms[swindex]; > + rgrp->cmms_mask |= BIT(hwindex % 2); > + } > + Good - this checks out :-D > drm_crtc_helper_add(crtc, &crtc_helper_funcs); > > /* Start with vertical blanking interrupt reporting disabled. */ > diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.h b/drivers/gpu/drm/rcar-du/rcar_du_crtc.h > index 3b7fc668996f..5f2940c42225 100644 > --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.h > +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.h > @@ -39,6 +39,7 @@ struct rcar_du_vsp; > * @vblank_wait: wait queue used to signal vertical blanking > * @vblank_count: number of vertical blanking interrupts to wait for > * @group: CRTC group this CRTC belongs to > + * @cmm: CMM associated with this CRTC > * @vsp: VSP feeding video to this CRTC > * @vsp_pipe: index of the VSP pipeline feeding video to this CRTC > * @writeback: the writeback connector > @@ -64,6 +65,7 @@ struct rcar_du_crtc { > unsigned int vblank_count; > > struct rcar_du_group *group; > + struct platform_device *cmm; > struct rcar_du_vsp *vsp; > unsigned int vsp_pipe; > > diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.h b/drivers/gpu/drm/rcar-du/rcar_du_drv.h > index a00dccc447aa..6316a1c5236c 100644 > --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.h > +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.h > @@ -13,6 +13,7 @@ > #include <linux/kernel.h> > #include <linux/wait.h> > > +#include "rcar_cmm.h" > #include "rcar_du_crtc.h" > #include "rcar_du_group.h" > #include "rcar_du_vsp.h" > @@ -86,6 +87,7 @@ struct rcar_du_device { > struct rcar_du_encoder *encoders[RCAR_DU_OUTPUT_MAX]; > > struct rcar_du_group groups[RCAR_DU_MAX_GROUPS]; > + struct platform_device *cmms[RCAR_DU_MAX_CRTCS]; > struct rcar_du_vsp vsps[RCAR_DU_MAX_VSPS]; > > struct { > diff --git a/drivers/gpu/drm/rcar-du/rcar_du_group.h b/drivers/gpu/drm/rcar-du/rcar_du_group.h > index 87950c1f6a52..e9906609c635 100644 > --- a/drivers/gpu/drm/rcar-du/rcar_du_group.h > +++ b/drivers/gpu/drm/rcar-du/rcar_du_group.h > @@ -22,6 +22,7 @@ struct rcar_du_device; > * @mmio_offset: registers offset in the device memory map > * @index: group index > * @channels_mask: bitmask of populated DU channels in this group > + * @cmms_mask: bitmask of available CMMs in this group > * @num_crtcs: number of CRTCs in this group (1 or 2) > * @use_count: number of users of the group (rcar_du_group_(get|put)) > * @used_crtcs: number of CRTCs currently in use > @@ -37,6 +38,7 @@ struct rcar_du_group { > unsigned int index; > > unsigned int channels_mask; > + unsigned int cmms_mask; > unsigned int num_crtcs; > unsigned int use_count; > unsigned int used_crtcs; > diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c > index 2dc9caee8767..294630e56992 100644 > --- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c > +++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c > @@ -17,7 +17,9 @@ > #include <drm/drm_probe_helper.h> > #include <drm/drm_vblank.h> > > +#include <linux/device.h> > #include <linux/of_graph.h> > +#include <linux/of_platform.h> > #include <linux/wait.h> > > #include "rcar_du_crtc.h" > @@ -614,6 +616,67 @@ static int rcar_du_vsps_init(struct rcar_du_device *rcdu) > return ret; > } > > +static int rcar_du_cmm_init(struct rcar_du_device *rcdu) > +{ > + const struct device_node *np = rcdu->dev->of_node; > + unsigned int i; > + int cells; > + > + cells = of_property_count_u32_elems(np, "renesas,cmms"); > + if (cells == -EINVAL) > + return 0; > + > + if (cells > rcdu->num_crtcs) { > + dev_err(rcdu->dev, > + "Invalid number of entries in 'renesas,cmms'\n"); > + return -EINVAL; > + } > + > + for (i = 0; i < cells; ++i) { > + struct platform_device *pdev; > + struct device_link *link; > + struct device_node *cmm; > + int ret; > + > + cmm = of_parse_phandle(np, "renesas,cmms", i); > + if (IS_ERR(cmm)) { > + dev_err(rcdu->dev, > + "Failed to parse 'renesas,cmms' property\n"); > + return PTR_ERR(cmm); Should we have a -ENOENT exception here somewhere? Otherwise I think platforms without a CMM will fail, and new kernels with old DTBs would also fail ? (based on my interpretation in __of_parse_phandle_with_args() that not finding a requested phandle returns -ENOENT). Scratch that - I've just seen above with the cells = of_property_count_u32_elems(np, "renesas,cmms"); which will return 0 if this device doesn't have a CMM. So - this all looks good to me. Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> > + } > + > + if (!of_device_is_available(cmm)) { > + /* It's fine to have a phandle to a non-enabled CMM. */ > + of_node_put(cmm); > + continue; > + } > + > + pdev = of_find_device_by_node(cmm); > + if (IS_ERR(pdev)) { > + dev_err(rcdu->dev, "No device found for CMM%u\n", i); > + of_node_put(cmm); > + return PTR_ERR(pdev); > + } > + > + of_node_put(cmm); > + > + ret = rcar_cmm_init(pdev); > + if (ret) > + return ret; > + > + link = device_link_add(rcdu->dev, &pdev->dev, DL_FLAG_STATELESS); > + if (!link) { > + dev_err(rcdu->dev, > + "Failed to create device link to CMM%u\n", i); > + return -EINVAL; > + } > + > + rcdu->cmms[i] = pdev; > + } > + > + return 0; > +} > + > int rcar_du_modeset_init(struct rcar_du_device *rcdu) > { > static const unsigned int mmio_offsets[] = { > @@ -704,6 +767,11 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu) > return ret; > } > > + /* Initialize the Color Management Modules. */ > + ret = rcar_du_cmm_init(rcdu); > + if (ret) > + return ret;> + > /* Create the CRTCs. */ > for (swindex = 0, hwindex = 0; swindex < rcdu->num_crtcs; ++hwindex) { > struct rcar_du_group *rgrp; >
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c index 2da46e3dc4ae..23f1d6cc1719 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c @@ -1194,6 +1194,12 @@ int rcar_du_crtc_create(struct rcar_du_group *rgrp, unsigned int swindex, if (ret < 0) return ret; + /* CMM might be disabled for this CRTC. */ + if (rcdu->cmms[swindex]) { + rcrtc->cmm = rcdu->cmms[swindex]; + rgrp->cmms_mask |= BIT(hwindex % 2); + } + drm_crtc_helper_add(crtc, &crtc_helper_funcs); /* Start with vertical blanking interrupt reporting disabled. */ diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.h b/drivers/gpu/drm/rcar-du/rcar_du_crtc.h index 3b7fc668996f..5f2940c42225 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.h +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.h @@ -39,6 +39,7 @@ struct rcar_du_vsp; * @vblank_wait: wait queue used to signal vertical blanking * @vblank_count: number of vertical blanking interrupts to wait for * @group: CRTC group this CRTC belongs to + * @cmm: CMM associated with this CRTC * @vsp: VSP feeding video to this CRTC * @vsp_pipe: index of the VSP pipeline feeding video to this CRTC * @writeback: the writeback connector @@ -64,6 +65,7 @@ struct rcar_du_crtc { unsigned int vblank_count; struct rcar_du_group *group; + struct platform_device *cmm; struct rcar_du_vsp *vsp; unsigned int vsp_pipe; diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.h b/drivers/gpu/drm/rcar-du/rcar_du_drv.h index a00dccc447aa..6316a1c5236c 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.h +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.h @@ -13,6 +13,7 @@ #include <linux/kernel.h> #include <linux/wait.h> +#include "rcar_cmm.h" #include "rcar_du_crtc.h" #include "rcar_du_group.h" #include "rcar_du_vsp.h" @@ -86,6 +87,7 @@ struct rcar_du_device { struct rcar_du_encoder *encoders[RCAR_DU_OUTPUT_MAX]; struct rcar_du_group groups[RCAR_DU_MAX_GROUPS]; + struct platform_device *cmms[RCAR_DU_MAX_CRTCS]; struct rcar_du_vsp vsps[RCAR_DU_MAX_VSPS]; struct { diff --git a/drivers/gpu/drm/rcar-du/rcar_du_group.h b/drivers/gpu/drm/rcar-du/rcar_du_group.h index 87950c1f6a52..e9906609c635 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_group.h +++ b/drivers/gpu/drm/rcar-du/rcar_du_group.h @@ -22,6 +22,7 @@ struct rcar_du_device; * @mmio_offset: registers offset in the device memory map * @index: group index * @channels_mask: bitmask of populated DU channels in this group + * @cmms_mask: bitmask of available CMMs in this group * @num_crtcs: number of CRTCs in this group (1 or 2) * @use_count: number of users of the group (rcar_du_group_(get|put)) * @used_crtcs: number of CRTCs currently in use @@ -37,6 +38,7 @@ struct rcar_du_group { unsigned int index; unsigned int channels_mask; + unsigned int cmms_mask; unsigned int num_crtcs; unsigned int use_count; unsigned int used_crtcs; diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c index 2dc9caee8767..294630e56992 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c @@ -17,7 +17,9 @@ #include <drm/drm_probe_helper.h> #include <drm/drm_vblank.h> +#include <linux/device.h> #include <linux/of_graph.h> +#include <linux/of_platform.h> #include <linux/wait.h> #include "rcar_du_crtc.h" @@ -614,6 +616,67 @@ static int rcar_du_vsps_init(struct rcar_du_device *rcdu) return ret; } +static int rcar_du_cmm_init(struct rcar_du_device *rcdu) +{ + const struct device_node *np = rcdu->dev->of_node; + unsigned int i; + int cells; + + cells = of_property_count_u32_elems(np, "renesas,cmms"); + if (cells == -EINVAL) + return 0; + + if (cells > rcdu->num_crtcs) { + dev_err(rcdu->dev, + "Invalid number of entries in 'renesas,cmms'\n"); + return -EINVAL; + } + + for (i = 0; i < cells; ++i) { + struct platform_device *pdev; + struct device_link *link; + struct device_node *cmm; + int ret; + + cmm = of_parse_phandle(np, "renesas,cmms", i); + if (IS_ERR(cmm)) { + dev_err(rcdu->dev, + "Failed to parse 'renesas,cmms' property\n"); + return PTR_ERR(cmm); + } + + if (!of_device_is_available(cmm)) { + /* It's fine to have a phandle to a non-enabled CMM. */ + of_node_put(cmm); + continue; + } + + pdev = of_find_device_by_node(cmm); + if (IS_ERR(pdev)) { + dev_err(rcdu->dev, "No device found for CMM%u\n", i); + of_node_put(cmm); + return PTR_ERR(pdev); + } + + of_node_put(cmm); + + ret = rcar_cmm_init(pdev); + if (ret) + return ret; + + link = device_link_add(rcdu->dev, &pdev->dev, DL_FLAG_STATELESS); + if (!link) { + dev_err(rcdu->dev, + "Failed to create device link to CMM%u\n", i); + return -EINVAL; + } + + rcdu->cmms[i] = pdev; + } + + return 0; +} + int rcar_du_modeset_init(struct rcar_du_device *rcdu) { static const unsigned int mmio_offsets[] = { @@ -704,6 +767,11 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu) return ret; } + /* Initialize the Color Management Modules. */ + ret = rcar_du_cmm_init(rcdu); + if (ret) + return ret; + /* Create the CRTCs. */ for (swindex = 0, hwindex = 0; swindex < rcdu->num_crtcs; ++hwindex) { struct rcar_du_group *rgrp;