Hi Benjamin,
thanks for reply.
On Fri, May 15, 2020 at 4:31 PM Benjamin GAIGNARD benjamin.gaignard@st.com wrote:
On 5/14/20 3:07 PM, dillon min wrote:
Hi Alexandre,
On Thu, May 14, 2020 at 8:53 PM Alexandre Torgue alexandre.torgue@st.com wrote:
On 5/14/20 10:24 AM, Linus Walleij wrote:
On Tue, May 12, 2020 at 9:04 AM dillon.minfei@gmail.com wrote:
From: dillon min dillon.minfei@gmail.com
Enable the ltdc & ili9341 on stm32429-disco board.
Signed-off-by: dillon min dillon.minfei@gmail.com
This mostly looks good but...
+&spi5 {
status = "okay";pinctrl-0 = <&spi5_pins>;pinctrl-names = "default";#address-cells = <1>;#size-cells = <0>;cs-gpios = <&gpioc 2 GPIO_ACTIVE_LOW>;dmas = <&dma2 3 2 0x400 0x0>,<&dma2 4 2 0x400 0x0>;dma-names = "rx", "tx";These DMA assignments seem to be SoC things and should rather be in the DTS(I) file where &spi5 is defined, right? stm32f429.dtsi I suppose?
I agree with Linus, DMA have to be defined in SoC dtsi. And if a board doesn't want to use it, we use the "delete-property".
Yes, will move to Soc dtsi in next submits.
i'm working on write a v4l2-m2m driver for dma2d of stm32 to support pixel conversion alpha blending between foreground and background graphics.
as you know, some soc's engineer trying to add this function to drm system.
do you know st's planning about soc's hardware accelerator driver on stm32mp? such as chrom-art, will add to drm subsystem via ioctl to access, or to v4l2,
On stm32mp we do not plan to use chrom-art in drm or v4l2 because it does fit with userland way of working. We use the GPU to do conversion, scaling, blending and composition in only one go. As explain here [1] DRM subsytem it isn't a solution and v4l2-m2m isn't used in any mainline compositors like Weston or android surfaceflinger.
Benjamin
After check stm32mp's datasheets, they don't have chrom-art ip inside. sorry for didn't check it yet.
for stm32h7 series with chrom-art, jpeg hardware accelerator inside. does st has plan to setup a driver to support it ? i prefer v4l2-m2m should be easier to implement it. co work with dcmi, fbdev.
thanks.
best regards.
Dillon
[1] https://www.phoronix.com/scan.php?page=news_item&px=Linux-DRM-No-2D-Acce...
thanks.
It is likely the same no matter which device is using spi5.
Yours, Linus Walleij
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