From: Dan Carpenter <dan.carpenter@oracle.com>
To: Xin Ji <xji@analogixsemi.com>
Cc: "devel@driverdev.osuosl.org" <devel@driverdev.osuosl.org>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Andrzej Hajda <a.hajda@samsung.com>,
Neil Armstrong <narmstrong@baylibre.com>,
Jonas Karlman <jonas@kwiboo.se>,
Jernej Skrabec <jernej.skrabec@siol.net>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
Nicolas Boichat <drinkcat@chromium.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
Sheng Pan <span@analogixsemi.com>
Subject: Re: [PATCH v2 2/2] drm/bridge: anx7625: Add anx7625 MIPI DSI/DPI to DP bridge driver
Date: Thu, 10 Oct 2019 12:53:15 +0300 [thread overview]
Message-ID: <20191010095315.GK13286@kadam> (raw)
In-Reply-To: <43f48a7036e5a2991bd6bd8a7361107b27e48c54.1570699576.git.xji@analogixsemi.com>
This code is *so* much nicer than before. I hope you feel good about
the changes. It makes me happy to look at this code now.
On Thu, Oct 10, 2019 at 09:34:19AM +0000, Xin Ji wrote:
> +static int edid_read(struct anx7625_data *ctx,
> + u8 offset, u8 *pblock_buf)
> +{
> + int ret, cnt;
> + struct device *dev = &ctx->client->dev;
> +
> + for (cnt = 0; cnt < EDID_TRY_CNT; cnt++) {
> + sp_tx_aux_wr(ctx, offset);
> + /* set I2C read com 0x01 mot = 0 and read 16 bytes */
> + ret = sp_tx_aux_rd(ctx, 0xf1);
> +
> + if (ret) {
> + sp_tx_rst_aux(ctx);
> + DRM_DEV_DEBUG_DRIVER(dev, "edid read failed, reset!\n");
> + cnt++;
I don't think you should increment cnt. It's just a counter.
> + } else {
> + ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client,
> + AP_AUX_BUFF_START,
> + MAX_DPCD_BUFFER_SIZE,
> + pblock_buf);
> + if (!ret)
> + break;
> + }
> + }
> +
> + if (cnt == EDID_TRY_CNT)
And it could mean that "cnt > EDID_TRY_CNT".
> + return -EIO;
> +
> + return 0;
> +}
> +
> +static int segments_edid_read(struct anx7625_data *ctx,
> + u8 segment, u8 *buf, u8 offset)
> +{
> + u8 cnt;
> + int ret;
> + struct device *dev = &ctx->client->dev;
> +
> + /* write address only */
> + ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
> + AP_AUX_ADDR_7_0, 0x30);
> + ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
> + AP_AUX_COMMAND, 0x04);
> + ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
> + AP_AUX_CTRL_STATUS,
> + AP_AUX_CTRL_ADDRONLY | AP_AUX_CTRL_OP_EN);
> +
> + ret |= wait_aux_op_finish(ctx);
> + /* write segment address */
> + ret |= sp_tx_aux_wr(ctx, segment);
> + /* data read */
> + ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
> + AP_AUX_ADDR_7_0, 0x50);
> + if (ret) {
> + DRM_ERROR("IO error : aux initial failed.\n");
> + return ret;
> + }
> +
> + for (cnt = 0; cnt < EDID_TRY_CNT; cnt++) {
> + sp_tx_aux_wr(ctx, offset);
> + /* set I2C read com 0x01 mot = 0 and read 16 bytes */
> + ret = sp_tx_aux_rd(ctx, 0xf1);
> +
> + if (ret) {
> + ret = sp_tx_rst_aux(ctx);
> + DRM_DEV_ERROR(dev, "segment read failed, reset!\n");
> + cnt++;
Same.
> + } else {
> + ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client,
> + AP_AUX_BUFF_START,
> + MAX_DPCD_BUFFER_SIZE, buf);
> + if (!ret)
> + break;
> + }
> + }
> +
> + if (cnt == EDID_TRY_CNT)
> + return -EIO;
> +
> + return 0;
> +}
regards,
dan carpenter
next prev parent reply other threads:[~2019-10-10 9:54 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-10 9:31 [PATCH v2 0/2] Add initial support for slimport anx7625 Xin Ji
2019-10-10 9:32 ` [PATCH v2 1/2] dt-bindings: drm/bridge: anx7625: MIPI to DP transmitter binding Xin Ji
2019-10-10 9:34 ` [PATCH v2 2/2] drm/bridge: anx7625: Add anx7625 MIPI DSI/DPI to DP bridge driver Xin Ji
2019-10-10 9:53 ` Dan Carpenter [this message]
2019-10-10 9:56 ` Dan Carpenter
2019-10-11 2:08 ` Xin Ji
-- strict thread matches above, loose matches on Subject: below --
2019-10-11 2:20 [PATCH v2 0/2] Add initial support for slimport anx7625 Xin Ji
2019-10-11 2:23 ` [PATCH v2 2/2] drm/bridge: anx7625: Add anx7625 MIPI DSI/DPI to DP bridge driver Xin Ji
2019-10-14 8:20 ` kbuild test robot
2019-10-15 9:19 ` Dan Carpenter
2019-10-09 9:26 [PATCH v2 0/2] Add initial support for slimport anx7625 Xin Ji
2019-10-09 9:28 ` [PATCH v2 2/2] drm/bridge: anx7625: Add anx7625 MIPI DSI/DPI to DP bridge driver Xin Ji
2019-10-09 11:30 ` Dan Carpenter
2019-10-09 13:06 ` Dan Carpenter
2019-10-10 3:19 ` Xin Ji
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