linux-kernel - Re: [PATCH v2 09/26] drm/rockchip: dw-mipi-dsi: respect message flags

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Message-ID: <58845BBC.3040105@rock-chips.com>
Date:   Sun, 22 Jan 2017 15:14:04 +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 09/26] drm/rockchip: dw-mipi-dsi: respect message flags

Hi John

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

On 01/22/2017 12:31 AM, John Keeping wrote:
> Instead of always sending commands in LP mode, respect the
> MIPI_DSI_MSG_USE_LPM flag to decide how to send each message.  Also
> request acks if MIPI_DSI_MSG_REQ_ACK is set.
>
> Signed-off-by: John Keeping <john@...anate.com>
> ---
> Unchanged in v2
> ---
>   drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 16 +++++++++++++++-
>   1 file changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> index 92dbc3e56603..15d33c3c8cb7 100644
> --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> @@ -542,6 +542,19 @@ static int dw_mipi_dsi_host_detach(struct mipi_dsi_host *host,
>   	return 0;
>   }
>   
> +static void dw_mipi_message_config(struct dw_mipi_dsi *dsi,
> +				   const struct mipi_dsi_msg *msg)
> +{
> +	u32 val = 0;
> +
> +	if (msg->flags & MIPI_DSI_MSG_REQ_ACK)
> +		val |= EN_ACK_RQST;
> +	if (msg->flags & MIPI_DSI_MSG_USE_LPM)
> +		val |= CMD_MODE_ALL_LP;
> +
> +	dsi_write(dsi, DSI_CMD_MODE_CFG, val);
> +}
> +
>   static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val)
>   {
>   	int ret;
> @@ -634,6 +647,8 @@ static ssize_t dw_mipi_dsi_host_transfer(struct mipi_dsi_host *host,
>   	struct dw_mipi_dsi *dsi = host_to_dsi(host);
>   	int ret;
>   
> +	dw_mipi_message_config(dsi, msg);
> +
>   	switch (msg->type) {
>   	case MIPI_DSI_DCS_SHORT_WRITE:
>   	case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
> @@ -745,7 +760,6 @@ static void dw_mipi_dsi_command_mode_config(struct dw_mipi_dsi *dsi)
>   {
>   	dsi_write(dsi, DSI_TO_CNT_CFG, HSTX_TO_CNT(1000) | LPRX_TO_CNT(1000));
>   	dsi_write(dsi, DSI_BTA_TO_CNT, 0xd00);
> -	dsi_write(dsi, DSI_CMD_MODE_CFG, CMD_MODE_ALL_LP);
>   	dsi_write(dsi, DSI_MODE_CFG, ENABLE_CMD_MODE);
>   }
>