diff options
| author |   Claudiu Beznea <claudiu.beznea@microchip.com> | 2019-12-18 14:28:24 +0200 |
|---|---|---|
| committer |   Sam Ravnborg <sam@ravnborg.org> | 2020-01-06 19:52:53 +0100 |
| commit | 07acf4bafe81dd37eff3fbcfbbdbc48084bc202b (patch) | |
| tree | b2031ddd15d3bccf410cbef0e9421268660e8a56 /drivers/gpu/drm/atmel-hlcdc | |
| parent | dt-bindings: fix warnings in xinpeng,xpp055c272.yaml (diff) | |
| download | linux-dev-07acf4bafe81dd37eff3fbcfbbdbc48084bc202b.tar.xz linux-dev-07acf4bafe81dd37eff3fbcfbbdbc48084bc202b.zip | |
drm: atmel-hlcdc: use double rate for pixel clock only if supported
Doubled system clock should be used as pixel cock source only if this
is supported. This is emphasized by the value of
atmel_hlcdc_crtc::dc::desc::fixed_clksrc.
Fixes: a6eca2abdd42 ("drm: atmel-hlcdc: add config option for clock selection")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Boris Brezillon <bbrezillon@kernel.org>
Cc: <stable@vger.kernel.org> # v5.3+
Link: https://patchwork.freedesktop.org/patch/msgid/1576672109-22707-2-git-send-email-claudiu.beznea@microchip.com
Diffstat (limited to 'drivers/gpu/drm/atmel-hlcdc')
| -rw-r--r-- | drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c index f2e73e6d46b8..5040ed8d0871 100644 --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c @@ -95,14 +95,14 @@ static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c) (adj->crtc_hdisplay - 1) | ((adj->crtc_vdisplay - 1) << 16)); + prate = clk_get_rate(crtc->dc->hlcdc->sys_clk); + mode_rate = adj->crtc_clock * 1000; if (!crtc->dc->desc->fixed_clksrc) { + prate *= 2; cfg |= ATMEL_HLCDC_CLKSEL; mask |= ATMEL_HLCDC_CLKSEL; } - prate = 2 * clk_get_rate(crtc->dc->hlcdc->sys_clk); - mode_rate = adj->crtc_clock * 1000; - div = DIV_ROUND_UP(prate, mode_rate); if (div < 2) { div = 2; |