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drm: atmel-hlcdc: add config option for clock selection

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SAM9x60 LCD Controller has no option to select clock source as previous
controllers have. To be able to use the same driver even for this LCD
controller add a config option to know if controller supports this.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1556195748-11106-2-git-send-email-claudiu.beznea@microchip.com
This commit is contained in:
Claudiu Beznea 2019-04-25 12:36:09 +00:00 committed by Sam Ravnborg
parent 3b295cb1a4
commit a6eca2abdd
2 changed files with 9 additions and 5 deletions
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12
drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
View File

@ -78,7 +78,8 @@ static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
unsigned long mode_rate;
struct videomode vm;
unsigned long prate;
unsigned int cfg;
unsigned int mask = ATMEL_HLCDC_CLKDIV_MASK | ATMEL_HLCDC_CLKPOL;
unsigned int cfg = 0;
int div;
vm.vfront_porch = adj->crtc_vsync_start - adj->crtc_vdisplay;
@ -101,7 +102,10 @@ static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
(adj->crtc_hdisplay - 1) |
((adj->crtc_vdisplay - 1) << 16));
cfg = ATMEL_HLCDC_CLKSEL;
if (!crtc->dc->desc->fixed_clksrc) {
cfg |= ATMEL_HLCDC_CLKSEL;
mask |= ATMEL_HLCDC_CLKSEL;
}
prate = 2 * clk_get_rate(crtc->dc->hlcdc->sys_clk);
mode_rate = adj->crtc_clock * 1000;
@ -132,9 +136,7 @@ static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
cfg |= ATMEL_HLCDC_CLKDIV(div);
regmap_update_bits(regmap, ATMEL_HLCDC_CFG(0),
ATMEL_HLCDC_CLKSEL | ATMEL_HLCDC_CLKDIV_MASK |
ATMEL_HLCDC_CLKPOL, cfg);
regmap_update_bits(regmap, ATMEL_HLCDC_CFG(0), mask, cfg);
cfg = 0;

2
drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
View File

@ -328,6 +328,7 @@ atmel_hlcdc_layer_to_plane(struct atmel_hlcdc_layer *layer)
* @max_hpw: maximum horizontal back/front porch width
* @conflicting_output_formats: true if RGBXXX output formats conflict with
* each other.
* @fixed_clksrc: true if clock source is fixed
* @layers: a layer description table describing available layers
* @nlayers: layer description table size
*/
@ -340,6 +341,7 @@ struct atmel_hlcdc_dc_desc {
int max_vpw;
int max_hpw;
bool conflicting_output_formats;
bool fixed_clksrc;
const struct atmel_hlcdc_layer_desc *layers;
int nlayers;
};