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drm: atmel-hlcdc: enable clock before configuring timing engine

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[ Upstream commit 2c1fb9d86f6820abbfaa38a6836157c76ccb4e7b ]

Changing pixel clock source without having this clock source enabled
will block the timing engine and the next operations after (in this case
setting ATMEL_HLCDC_CFG(5) settings in atmel_hlcdc_crtc_mode_set_nofb()
will fail). It is recomended (although in datasheet this is not present)
to actually enabled pixel clock source before doing any changes on timing
enginge (only SAM9X60 datasheet specifies that the peripheral clock and
pixel clock must be enabled before using LCD controller).

Fixes: 1a396789f65a ("drm: add Atmel HLCDC Display Controller support")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Boris Brezillon <boris.brezillon@free-electrons.com>
Cc: <stable@vger.kernel.org> # v4.0+
Link: https://patchwork.freedesktop.org/patch/msgid/1576672109-22707-3-git-send-email-claudiu.beznea@microchip.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Claudiu Beznea 2019-12-18 14:28:25 +02:00 committed by prashantpaddune
parent 1de740a7ad
commit de79f9804c
1 changed files with 7 additions and 1 deletions

8
drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
View File

@ -63,7 +63,11 @@ static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
struct videomode vm;
unsigned long prate;
unsigned int cfg;
int div;
int div, ret;
ret = clk_prepare_enable(crtc->dc->hlcdc->sys_clk);
if (ret)
return;
vm.vfront_porch = adj->crtc_vsync_start - adj->crtc_vdisplay;
vm.vback_porch = adj->crtc_vtotal - adj->crtc_vsync_end;
@ -119,6 +123,8 @@ static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
ATMEL_HLCDC_VSPSU | ATMEL_HLCDC_VSPHO |
ATMEL_HLCDC_GUARDTIME_MASK,
cfg);
clk_disable_unprepare(crtc->dc->hlcdc->sys_clk);
}
static bool atmel_hlcdc_crtc_mode_fixup(struct drm_crtc *crtc,