Hi Wen,
On Wed, Jul 17, 2019 at 05:23:53PM +0800, Wen He wrote:
> Configure the display Quality of service (QoS) levels to high priority
> if the level is defined as high as in DTS. The ARQOS for DP500 is driven
> from the "RQOS" register, needed to program the RQOS register value < 7
> for the 4k resolution flicker to disappear on the LS1028A platform.
Thanks for taking time to come up with a more generic patch for your issue!
I have a question: what happens if you program the MALIDP500_RQOS_QUALITY
register to 0xd000d000 for all pixelclocks?
Also, some suggestions further down:
>
> Signed-off-by: Wen He <wen.he_1@xxxxxxx>
> ---
> change in v2:
> - add new implementation for 4k flicker issue on the LS1028A
>
> drivers/gpu/drm/arm/malidp_drv.c | 5 +++++
> drivers/gpu/drm/arm/malidp_hw.c | 13 +++++++++++++
> drivers/gpu/drm/arm/malidp_hw.h | 3 +++
> drivers/gpu/drm/arm/malidp_regs.h | 12 ++++++++++++
> 4 files changed, 33 insertions(+)
>
> diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
> index f25ec4382277..d2b2cf52ac87 100644
> --- a/drivers/gpu/drm/arm/malidp_drv.c
> +++ b/drivers/gpu/drm/arm/malidp_drv.c
> @@ -818,6 +818,11 @@ static int malidp_bind(struct device *dev)
>
> malidp->core_id = version;
>
> + hwdev->arqos_high_level = false;
This is not needed.
> +
> + hwdev->arqos_high_level = of_property_read_bool(dev->of_node,
> + "arm,malidp-arqos-high-level");
I think it would be better to have this property as a u32 value, rather than a
boolean, and put the value that we want to program MALIDP_RQOS_QUALITY with in
there.
Also, you need to add the documentation for this optional property in
Documentation/devicetree/bindings/display/arm,malidp.txt.
> +
> /* set the number of lines used for output of RGB data */
> ret = of_property_read_u8_array(dev->of_node,
> "arm,malidp-output-port-lines",
> diff --git a/drivers/gpu/drm/arm/malidp_hw.c b/drivers/gpu/drm/arm/malidp_hw.c
> index 50af399d7f6f..eaa1658cd86b 100644
> --- a/drivers/gpu/drm/arm/malidp_hw.c
> +++ b/drivers/gpu/drm/arm/malidp_hw.c
> @@ -374,6 +374,19 @@ static void malidp500_modeset(struct malidp_hw_device *hwdev, struct videomode *
> malidp_hw_setbits(hwdev, MALIDP_DISP_FUNC_ILACED, MALIDP_DE_DISPLAY_FUNC);
> else
> malidp_hw_clearbits(hwdev, MALIDP_DISP_FUNC_ILACED, MALIDP_DE_DISPLAY_FUNC);
> +
> + /*
> + * Program the RQoS register to increasing QoS levels for
> + * the 4k resolution flicker to disappear on the LS1028A.
Looks like two sentences got smashed into one, the result is a bit hard to read.
Best regards,
Liviu
> + */
> + if (hwdev->arqos_high_level) {
> + val = RED_ARQOS_VALUE | GREEN_ARQOS_VALUE;
> +
> + if (mode->pixelclock == 594000000)
> + malidp_hw_setbits(hwdev, val, MALIDP500_RQOS_QUALITY);
> + else
> + malidp_hw_clearbits(hwdev, val, MALIDP500_RQOS_QUALITY);
> + }
> }
>
> int malidp_format_get_bpp(u32 fmt)
> diff --git a/drivers/gpu/drm/arm/malidp_hw.h b/drivers/gpu/drm/arm/malidp_hw.h
> index 968a65eed371..b8baba60508a 100644
> --- a/drivers/gpu/drm/arm/malidp_hw.h
> +++ b/drivers/gpu/drm/arm/malidp_hw.h
> @@ -251,6 +251,9 @@ struct malidp_hw_device {
>
> /* size of memory used for rotating layers, up to two banks available */
> u32 rotation_memory[2];
> +
> + /* priority level of RQOS register used for driven the ARQOS signal */
> + bool arqos_high_level;
> };
>
> static inline u32 malidp_hw_read(struct malidp_hw_device *hwdev, u32 reg)
> diff --git a/drivers/gpu/drm/arm/malidp_regs.h b/drivers/gpu/drm/arm/malidp_regs.h
> index 993031542fa1..08842142b3b2 100644
> --- a/drivers/gpu/drm/arm/malidp_regs.h
> +++ b/drivers/gpu/drm/arm/malidp_regs.h
> @@ -210,6 +210,18 @@
> #define MALIDP500_CONFIG_VALID 0x00f00
> #define MALIDP500_CONFIG_ID 0x00fd4
>
> +/*
> + * The quality of service (QoS) register on the DP500. RQOS register values
> + * are driven by the ARQOS signal, using AXI transacations, dependent on the
> + * FIFO input level.
> + * The RQOS register can also set QoS levels for:
> + * - RED_ARQOS @ A 4-bit signal value for close to underflow conditions
> + * - GREEN_ARQOS @ A 4-bit signal value for normal conditions
> + */
> +#define MALIDP500_RQOS_QUALITY 0x00500
> +#define RED_ARQOS_VALUE (0xd << 12)
> +#define GREEN_ARQOS_VALUE (0xd << 28)
> +
> /* register offsets and bits specific to DP550/DP650 */
> #define MALIDP550_ADDR_SPACE_SIZE 0x10000
> #define MALIDP550_DE_CONTROL 0x00010
> --
> 2.17.1
>
--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
¯\_(ツ)_/¯
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