linux-kernel - Re: [PATCH v3 3/3] drm/tinydrm: add driver for ST7735R panels

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Date:   Thu, 21 Dec 2017 13:35:14 -0600
From:   David Lechner <david@...hnology.com>
To:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     Noralf Trønnes <noralf@...nnes.org>,
        limor@...yada.net, Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] drm/tinydrm: add driver for ST7735R panels

On 12/21/2017 01:23 PM, David Lechner wrote:
> This adds a new driver for Sitronix ST7735R display panels.
> 
> This has been tested using an Adafruit 1.8" TFT.
> 
> Signed-off-by: David Lechner <david@...hnology.com>
> ---

<snip>

> +	mipi_dbi_command(mipi, ST7735R_GAMCTRP1, 0x0f, 0x1a, 0x0f, 0x18, 0x2f,
> +			 0x28, 0x20, 0x22, 0x1f, 0x1b, 0x23, 0x37, 0x00, 0x07,
> +			 0x02, 0x10);
> +	mipi_dbi_command(mipi, ST7735R_GAMCTRN1, 0x0f, 0x1b, 0x0f, 0x17, 0x33,
> +			 0x2c, 0x29, 0x2e, 0x30, 0x30, 0x39, 0x3f, 0x00, 0x07,
> +			 0x03, 0x10);
By the way, how do you know what is the "right" gamma curve? I think I 
copied this from the generic st7735r driver in fbtft, but I noticed that 
there is also a different curve for the Adafruit 1.8" display in fbtft. 
I'm wondering if I should have used that one instead. I can't really 
tell a difference looking at the display.