linux-kernel - Re: [PATCH v9 2/2] drm/bridge: Add I2C based driver for ps8640 bridge

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Date:	Wed, 3 Feb 2016 18:37:10 +0800
From:	Daniel Kurtz <djkurtz@...omium.org>
To:	Jitao Shi <jitao.shi@...iatek.com>
Cc:	David Airlie <airlied@...ux.ie>,
	Mark Rutland <mark.rutland@....com>, stonea168@....com,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	Ajay Kumar <ajaykumar.rs@...sung.com>,
	Vincent Palatin <vpalatin@...omium.org>,
	cawa cheng <cawa.cheng@...iatek.com>,
	Bibby Hsieh (謝濟遠) 
	<bibby.hsieh@...iatek.com>, CK HU <ck.hu@...iatek.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Thierry Reding <treding@...dia.com>,
	Sean Paul <seanpaul@...omium.org>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Inki Dae <inki.dae@...sung.com>,
	Rob Herring <robh+dt@...nel.org>,
	"moderated list:ARM/Mediatek SoC support" 
	<linux-mediatek@...ts.infradead.org>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Eddie Huang (黃智傑) 
	<eddie.huang@...iatek.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Rahul Sharma <rahul.sharma@...sung.com>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Kumar Gala <galak@...eaurora.org>,
	Andy Yan <andy.yan@...k-chips.com>
Subject: Re: [PATCH v9 2/2] drm/bridge: Add I2C based driver for ps8640 bridge

Hi Jitao,

Looks really good.

Just a couple of tiny things...



On Wed, Feb 3, 2016 at 4:48 PM, Jitao Shi <jitao.shi@...iatek.com> wrote:
>
> This patch adds drm_bridge driver for parade DSI to eDP bridge chip.
>
> Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
> ---

[snip]

> +static int ps8640_get_modes(struct drm_connector *connector)
> +{
> +       struct ps8640 *ps_bridge = connector_to_ps8640(connector);
> +       u8 *edid;
> +       int ret, num_modes = 0;
> +       bool power_off;
> +
> +       if (ps_bridge->edid)
> +               return drm_add_edid_modes(connector, ps_bridge->edid);
> +
> +       power_off = !ps_bridge->enabled;
> +       ps8640_pre_enable(&ps_bridge->bridge);
> +
> +       edid = kmalloc(EDID_LENGTH, GFP_KERNEL);

devm_kmalloc() if you can.  Or at least kfree() in ps8640_remove


> +       if (!edid) {
> +               DRM_ERROR("Failed to allocate EDID\n");
> +               return 0;
> +       }
> +
> +       ret = ps8640_read(ps_bridge->ddc_i2c, 0, edid, EDID_LENGTH);
> +       if (ret) {
> +               kfree(edid);
> +               goto out;
> +       }
> +
> +       ps_bridge->edid = (struct edid *)edid;
> +       drm_mode_connector_update_edid_property(connector, ps_bridge->edid);
> +
> +       num_modes = drm_add_edid_modes(connector, ps_bridge->edid);
> +
> +out:
> +       if (power_off)
> +               ps8640_post_disable(&ps_bridge->bridge);
> +
> +       return num_modes;
> +}

[snip]

> +static int ps8640_spi_normal_mode(struct ps8640 *ps_bridge)
> +{
> +       u8 cmd[2];
> +       struct i2c_client *client = ps_bridge->page[2];
> +
> +       /* Enable-Write-Status-Register */
> +       cmd[0] = WRITE_ENABLE_CMD;
> +       ps8640_spi_send_cmd(ps_bridge, cmd, 1);
> +
> +       /* protect BPL/BP0/BP1 */
> +       cmd[0] = WRITE_STATUS_REG_CMD;
> +       cmd[1] = BLK_PROTECT_BITS | STATUS_REG_PROTECT;
> +       ps8640_spi_send_cmd(ps_bridge, cmd, 2);
> +
> +       /* wait for SPI rom ready */
> +       ps8640_wait_rom_idle(ps_bridge);
> +
> +       /* disable PS8640 mapping function */
> +       ps8640_write_byte(client, PAGE2_ENCTLSPI_WR, 0x00);
> +
> +       gpiod_set_value(ps_bridge->gpio_mode_sel_n, 1);
> +       return 0;
> +}
> +
> +static int ps8640_enter_bl(struct ps8640 *ps_bridge)
> +{
> +       ps_bridge->in_fw_update = true;
> +       return ps8640_spi_dl_mode(ps_bridge);


On error:
 ps_bridge->in_fw_update = false;

Thanks,
-Dan