On Tue, Oct 15, 2024 at 05:37:46PM +0530, Jyothi Kumar Seerapu wrote: > When high performance with multiple i2c messages in a single transfer > is required, employ Block Event Interrupt (BEI) to trigger interrupts > after specific messages transfer and the last message transfer, > thereby reducing interrupts. > > For each i2c message transfer, a series of Transfer Request Elements(TREs) > must be programmed, including config tre for frequency configuration, > go tre for holding i2c address and dma tre for holding dma buffer address, > length as per the hardware programming guide. For transfer using BEI, > multiple I2C messages may necessitate the preparation of config, go, > and tx DMA TREs. However, a channel TRE size of 64 is often insufficient, > potentially leading to failures due to inadequate memory space. > > Add additional argument to dma-cell property for channel TRE size. No such property 'dma-cell' > With this, adjust the channel TRE size via the device tree. > The default size is 64, but clients can modify this value based on > their specific requirements. > > Signed-off-by: Jyothi Kumar Seerapu <quic_jseerapu@xxxxxxxxxxx> > --- > Documentation/devicetree/bindings/dma/qcom,gpi.yaml | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/Documentation/devicetree/bindings/dma/qcom,gpi.yaml b/Documentation/devicetree/bindings/dma/qcom,gpi.yaml > index 4df4e61895d2..002495921643 100644 > --- a/Documentation/devicetree/bindings/dma/qcom,gpi.yaml > +++ b/Documentation/devicetree/bindings/dma/qcom,gpi.yaml > @@ -54,14 +54,16 @@ properties: > maxItems: 13 > > "#dma-cells": > - const: 3 > + minItems: 3 > + maxItems: 4 > description: > > DMA clients must use the format described in dma.txt, giving a phandle > - to the DMA controller plus the following 3 integer cells: > + to the DMA controller plus the following 4 integer cells: > - channel: if set to 0xffffffff, any available channel will be allocated > for the client. Otherwise, the exact channel specified will be used. > - seid: serial id of the client as defined in the SoC documentation. > - client: type of the client as defined in dt-bindings/dma/qcom-gpi.h > + - channel-tre-size: size of the channel TRE (transfer ring element) > > iommus: > maxItems: 1 > -- > 2.17.1 >
