linux-kernel - Re: [PATCH v2 14/26] drm/rockchip: dw-mipi-dsi: fix escape clock rate

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Date:   Sun, 22 Jan 2017 17:37:18 +0800
From:   Chris Zhong <zyw@...k-chips.com>
To:     John Keeping <john@...anate.com>,
        Mark Yao <mark.yao@...k-chips.com>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 14/26] drm/rockchip: dw-mipi-dsi: fix escape clock rate

Reviewed-by: Chris Zhong <zyw@...k-chips.com>

On 01/22/2017 12:31 AM, John Keeping wrote:
> Use the same calculation as the vendor kernel to derive the escape clock
> speed.
>
> Signed-off-by: John Keeping <john@...anate.com>
> ---
> Unchanged in v2
> ---
>   drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> index 290282e86d16..c2e0ba96e0a0 100644
> --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> @@ -710,11 +710,13 @@ static void dw_mipi_dsi_disable(struct dw_mipi_dsi *dsi)
>   
>   static void dw_mipi_dsi_init(struct dw_mipi_dsi *dsi)
>   {
> +	u32 esc_clk_division = (dsi->lane_mbps >> 3) / 20 + 1;
> +
>   	dsi_write(dsi, DSI_PWR_UP, RESET);
>   	dsi_write(dsi, DSI_PHY_RSTZ, PHY_DISFORCEPLL | PHY_DISABLECLK
>   		  | PHY_RSTZ | PHY_SHUTDOWNZ);
>   	dsi_write(dsi, DSI_CLKMGR_CFG, TO_CLK_DIVIDSION(10) |
> -		  TX_ESC_CLK_DIVIDSION(7));
> +		  TX_ESC_CLK_DIVIDSION(esc_clk_division));
>   }
>   
>   static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi,