linux-kernel - Re: [PATCH v3 15/24] drm/rockchip: dw-mipi-dsi: configure PHY before enabling

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Message-ID: <20170130202808.GR20076@art_vandelay>
Date:   Mon, 30 Jan 2017 15:28:08 -0500
From:   Sean Paul <seanpaul@...omium.org>
To:     John Keeping <john@...anate.com>
Cc:     Mark Yao <mark.yao@...k-chips.com>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org,
        Chris Zhong <zyw@...k-chips.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 15/24] drm/rockchip: dw-mipi-dsi: configure PHY before
 enabling

On Sun, Jan 29, 2017 at 01:24:35PM +0000, John Keeping wrote:
> The bias, bandgap and PLL should all be configured before we enable
> them.
> 

Do you know why the test codes are hard-coded magic? It'd be nice to make some
sense of them in a future patch.

Reviewed-by: Sean Paul <seanpaul@...omium.org>

> Signed-off-by: John Keeping <john@...anate.com>
> ---
> v3:
> - Squash together two patches that both affect initialization order of
>   the PHY
> Unchanged in v2
> 
>  drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> index 5b3068e9e8db..cfe7e4ba305c 100644
> --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> @@ -413,12 +413,17 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
>  
>  	dw_mipi_dsi_phy_write(dsi, 0x44, HSFREQRANGE_SEL(testdin));
>  
> -	dw_mipi_dsi_phy_write(dsi, 0x19, PLL_LOOP_DIV_EN | PLL_INPUT_DIV_EN);
>  	dw_mipi_dsi_phy_write(dsi, 0x17, INPUT_DIVIDER(dsi->input_div));
>  	dw_mipi_dsi_phy_write(dsi, 0x18, LOOP_DIV_LOW_SEL(dsi->feedback_div) |
>  					 LOW_PROGRAM_EN);
>  	dw_mipi_dsi_phy_write(dsi, 0x18, LOOP_DIV_HIGH_SEL(dsi->feedback_div) |
>  					 HIGH_PROGRAM_EN);
> +	dw_mipi_dsi_phy_write(dsi, 0x19, PLL_LOOP_DIV_EN | PLL_INPUT_DIV_EN);
> +
> +	dw_mipi_dsi_phy_write(dsi, 0x22, LOW_PROGRAM_EN |
> +					 BIASEXTR_SEL(BIASEXTR_127_7));
> +	dw_mipi_dsi_phy_write(dsi, 0x22, HIGH_PROGRAM_EN |
> +					 BANDGAP_SEL(BANDGAP_96_10));
>  
>  	dw_mipi_dsi_phy_write(dsi, 0x20, POWER_CONTROL | INTERNAL_REG_CURRENT |
>  					 BIAS_BLOCK_ON | BANDGAP_ON);
> @@ -429,10 +434,6 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
>  					 SETRD_MAX | POWER_MANAGE |
>  					 TER_RESISTORS_ON);
>  
> -	dw_mipi_dsi_phy_write(dsi, 0x22, LOW_PROGRAM_EN |
> -					 BIASEXTR_SEL(BIASEXTR_127_7));
> -	dw_mipi_dsi_phy_write(dsi, 0x22, HIGH_PROGRAM_EN |
> -					 BANDGAP_SEL(BANDGAP_96_10));
>  
>  	dw_mipi_dsi_phy_write(dsi, 0x70, TLP_PROGRAM_EN | 0xf);
>  	dw_mipi_dsi_phy_write(dsi, 0x71, THS_PRE_PROGRAM_EN | 0x55);
> -- 
> 2.11.0.197.gb556de5.dirty
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Sean Paul, Software Engineer, Google / Chromium OS

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