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Message-ID: <894b0408-038f-6bd2-2130-d46de332e215@axentia.se>
Date: Sun, 22 Apr 2018 00:13:25 +0200
From: Peter Rosin <peda@...ntia.se>
To: Boris Brezillon <boris.brezillon@...tlin.com>
Cc: linux-kernel@...r.kernel.org, David Airlie <airlied@...ux.ie>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Nicolas Ferre <nicolas.ferre@...rochip.com>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
Boris Brezillon <boris.brezillon@...e-electrons.com>,
Daniel Vetter <daniel.vetter@...el.com>,
Gustavo Padovan <gustavo@...ovan.org>,
Sean Paul <seanpaul@...omium.org>,
Russell King <linux@...linux.org.uk>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Jacopo Mondi <jacopo+renesas@...ndi.org>,
dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 4/7] drm/atmel-hlcdc: support bus-width (12/16/18/24)
in endpoint nodes
On 2018-04-21 18:19, Boris Brezillon wrote:
> On Thu, 19 Apr 2018 18:27:48 +0200
> Peter Rosin <peda@...ntia.se> wrote:
>
>> This beats the heuristic that the connector is involved in what format
>> should be output for cases where this fails.
>>
>> E.g. if there is a bridge that changes format between the encoder and the
>> connector, or if some of the RGB pins between the lcd controller and the
>> encoder are not routed on the PCB.
>>
>> This is critical for the devices that have the "conflicting output
>> formats" issue (SAM9N12, SAM9X5, SAMA5D3), since the most significant
>> RGB bits move around depending on the selected output mode. For
>> devices that do not have the "conflicting output formats" issue
>> (SAMA5D2, SAMA5D4), this is completely irrelevant.
>>
>> Signed-off-by: Peter Rosin <peda@...ntia.se>
>> ---
>> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c | 71 +++++++++++++++++-------
>> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h | 2 +
>> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c | 40 ++++++++++++-
>> 3 files changed, 92 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
>> index d73281095fac..b4e7f5b6f497 100644
>> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
>> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
>> @@ -226,6 +226,56 @@ static void atmel_hlcdc_crtc_atomic_enable(struct drm_crtc *c,
>> #define ATMEL_HLCDC_RGB888_OUTPUT BIT(3)
>> #define ATMEL_HLCDC_OUTPUT_MODE_MASK GENMASK(3, 0)
>>
>> +static int atmel_hlcdc_connector_output_mode(struct drm_connector_state *state)
>> +{
>> + struct drm_connector *connector = state->connector;
>> + struct atmel_hlcdc_dc *dc = connector->dev->dev_private;
>> + struct drm_encoder *encoder;
>> + struct drm_display_info *info = &connector->display_info;
>> + unsigned int supported_fmts = 0;
>> + int j;
>> +
>> + encoder = state->best_encoder;
>> + if (!encoder)
>> + encoder = connector->encoder;
>> +
>> + switch (dc->bus_fmt[encoder->index]) {
>> + case 0:
>> + break;
>> + case MEDIA_BUS_FMT_RGB444_1X12:
>> + return ATMEL_HLCDC_RGB444_OUTPUT;
>> + case MEDIA_BUS_FMT_RGB565_1X16:
>> + return ATMEL_HLCDC_RGB565_OUTPUT;
>> + case MEDIA_BUS_FMT_RGB666_1X18:
>> + return ATMEL_HLCDC_RGB666_OUTPUT;
>> + case MEDIA_BUS_FMT_RGB888_1X24:
>> + return ATMEL_HLCDC_RGB888_OUTPUT;
>> + default:
>> + return -EINVAL;
>> + }
>> +
>> + for (j = 0; j < info->num_bus_formats; j++) {
>> + switch (info->bus_formats[j]) {
>> + case MEDIA_BUS_FMT_RGB444_1X12:
>> + supported_fmts |= ATMEL_HLCDC_RGB444_OUTPUT;
>> + break;
>> + case MEDIA_BUS_FMT_RGB565_1X16:
>> + supported_fmts |= ATMEL_HLCDC_RGB565_OUTPUT;
>> + break;
>> + case MEDIA_BUS_FMT_RGB666_1X18:
>> + supported_fmts |= ATMEL_HLCDC_RGB666_OUTPUT;
>> + break;
>> + case MEDIA_BUS_FMT_RGB888_1X24:
>> + supported_fmts |= ATMEL_HLCDC_RGB888_OUTPUT;
>> + break;
>> + default:
>> + break;
>> + }
>> + }
>> +
>> + return supported_fmts;
>> +}
>> +
>> static int atmel_hlcdc_crtc_select_output_mode(struct drm_crtc_state *state)
>> {
>> unsigned int output_fmts = ATMEL_HLCDC_OUTPUT_MODE_MASK;
>> @@ -238,31 +288,12 @@ static int atmel_hlcdc_crtc_select_output_mode(struct drm_crtc_state *state)
>> crtc = drm_crtc_to_atmel_hlcdc_crtc(state->crtc);
>>
>> for_each_new_connector_in_state(state->state, connector, cstate, i) {
>> - struct drm_display_info *info = &connector->display_info;
>> unsigned int supported_fmts = 0;
>> - int j;
>>
>> if (!cstate->crtc)
>> continue;
>>
>> - for (j = 0; j < info->num_bus_formats; j++) {
>> - switch (info->bus_formats[j]) {
>> - case MEDIA_BUS_FMT_RGB444_1X12:
>> - supported_fmts |= ATMEL_HLCDC_RGB444_OUTPUT;
>> - break;
>> - case MEDIA_BUS_FMT_RGB565_1X16:
>> - supported_fmts |= ATMEL_HLCDC_RGB565_OUTPUT;
>> - break;
>> - case MEDIA_BUS_FMT_RGB666_1X18:
>> - supported_fmts |= ATMEL_HLCDC_RGB666_OUTPUT;
>> - break;
>> - case MEDIA_BUS_FMT_RGB888_1X24:
>> - supported_fmts |= ATMEL_HLCDC_RGB888_OUTPUT;
>> - break;
>> - default:
>> - break;
>> - }
>> - }
>> + supported_fmts = atmel_hlcdc_connector_output_mode(cstate);
>>
>> if (crtc->dc->desc->conflicting_output_formats)
>> output_fmts &= supported_fmts;
>> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
>> index ab32d5b268d2..be2d180dd169 100644
>> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
>> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
>> @@ -365,6 +365,7 @@ struct atmel_hlcdc_plane_properties {
>> * @hlcdc: pointer to the atmel_hlcdc structure provided by the MFD device
>> * @fbdev: framebuffer device attached to the Display Controller
>> * @crtc: CRTC provided by the display controller
>> + * @bus_fmt: Array of bus format overrides, per connector.
>> * @planes: instantiated planes
>> * @layers: active HLCDC layers
>> * @wq: display controller workqueue
>> @@ -376,6 +377,7 @@ struct atmel_hlcdc_dc {
>> struct dma_pool *dscrpool;
>> struct atmel_hlcdc *hlcdc;
>> struct drm_crtc *crtc;
>> + int *bus_fmt;
>
> Looks like this bus_fmt information should be attached to the
> atmel_hlcdc_rgb_output object, since the property is placed in the
> endpoint representing the DPI encoder output.
>
> You could then parse the format in atmel_hlcdc_attach_endpoint() and
> provide a helper to retrieve the hardcoded bus-format attached to an
> encoder:
>
> int atmel_hlcdc_encoder_get_bus_fmt(struct drm_encoder *encoder);
>
> and if it returns zero you can fallback to bus formats
> defined in drm_display_info, as you do in this patch.
Good suggestion. However, it appears the atmel_hlcdc_rgb_output object
was removed in 4.13. But I'm bringing it back like this
struct atmel_hlcdc_rgb_output {
struct drm_encoder encoder;
int bus_fmt;
};
and adjusting the code to match that. It all looks nice and tidy, methinks.
v4 coming up Monday, if nothing unexpected happens.
Cheers,
Peter
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