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drm: atmel-hlcdc: Support inverting the pixel clock polarity

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On the SoC host controller, the pixel clock can be:
* standard: data is launched on the rising edge
* inverted: data is launched on the falling edge

Some panels may need the inverted option to be used so let's support
this DRM flag.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230609144843.851327-1-miquel.raynal@bootlin.com
This commit is contained in:
Miquel Raynal 2023-06-09 16:48:43 +02:00 committed by Boris Brezillon
parent 2da20c92ce
commit d01cb0457d
1 changed files with 25 additions and 0 deletions
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25
drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
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@ -68,7 +68,11 @@ static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
struct regmap *regmap = crtc->dc->hlcdc->regmap;
struct drm_display_mode *adj = &c->state->adjusted_mode;
struct drm_encoder *encoder = NULL, *en_iter;
struct drm_connector *connector = NULL;
struct atmel_hlcdc_crtc_state *state;
struct drm_device *ddev = c->dev;
struct drm_connector_list_iter iter;
unsigned long mode_rate;
struct videomode vm;
unsigned long prate;
@ -76,6 +80,23 @@ static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
unsigned int cfg = 0;
int div, ret;
/* get encoder from crtc */
drm_for_each_encoder(en_iter, ddev) {
if (en_iter->crtc == c) {
encoder = en_iter;
break;
}
}
if (encoder) {
/* Get the connector from encoder */
drm_connector_list_iter_begin(ddev, &iter);
drm_for_each_connector_iter(connector, &iter)
if (connector->encoder == encoder)
break;
drm_connector_list_iter_end(&iter);
}
ret = clk_prepare_enable(crtc->dc->hlcdc->sys_clk);
if (ret)
return;
@ -134,6 +155,10 @@ static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
cfg |= ATMEL_HLCDC_CLKDIV(div);
if (connector &&
connector->display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
cfg |= ATMEL_HLCDC_CLKPOL;
regmap_update_bits(regmap, ATMEL_HLCDC_CFG(0), mask, cfg);
state = drm_crtc_state_to_atmel_hlcdc_crtc_state(c->state);