Re: [RESEND PATCH v2 3/6] ARM: dts: stm32: support display on stm32f746-disco board
From: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Date: 2023-06-07 12:50:57
Also in:
dri-devel, linux-arm-kernel, lkml
Hi Jagan, On Wed, Jun 7, 2023 at 8:43 AM Jagan Teki [off-list ref] wrote:
On Wed, Jun 7, 2023 at 12:01 PM Dario Binacchi [off-list ref] wrote:quoted
Add support to Rocktech RK043FN48H display on stm32f746-disco board. Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com> --- (no changes since v1) arch/arm/boot/dts/stm32f746-disco.dts | 51 +++++++++++++++++++++++++++ 1 file changed, 51 insertions(+)diff --git a/arch/arm/boot/dts/stm32f746-disco.dts b/arch/arm/boot/dts/stm32f746-disco.dts index c11616ed5fc6..cda423b6a874 100644 --- a/arch/arm/boot/dts/stm32f746-disco.dts +++ b/arch/arm/boot/dts/stm32f746-disco.dts@@ -60,10 +60,41 @@ memory@c0000000 { reg = <0xC0000000 0x800000>; }; + reserved-memory { + #address-cells = <1>; + #size-cells = <1>; + ranges; + + linux,cma { + compatible = "shared-dma-pool"; + no-map; + size = <0x80000>; + linux,dma-default; + }; + };This looks unrelated to display enablement, isn't it?
Without the "reserved-memory" node, it is not possible to allocate memory for the framebuffer. I got this error: stm32-display 40016800.display-controller: [drm] *ERROR* failed to allocate buffer with size 139264 Thanks and regards, Dario
Jagan.
-- Dario Binacchi Senior Embedded Linux Developer dario.binacchi@amarulasolutions.com __________________________________ Amarula Solutions SRL Via Le Canevare 30, 31100 Treviso, Veneto, IT T. +39 042 243 5310 info@amarulasolutions.com www.amarulasolutions.com