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Thu, 19 Dec 2019 18:35:52 -0800 Received: from MTKMBS07N2.mediatek.inc (172.21.101.141) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Thu, 19 Dec 2019 18:31:55 -0800 Received: from MTKCAS06.mediatek.inc (172.21.101.30) by mtkmbs07n2.mediatek.inc (172.21.101.141) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Fri, 20 Dec 2019 10:31:11 +0800 Received: from [172.21.77.4] (172.21.77.4) by MTKCAS06.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Fri, 20 Dec 2019 10:30:36 +0800 Message-ID: <1576809089.26847.10.camel@mtksdaap41> Subject: Re: [PATCH 4/4] drm/mediatek: config mipitx impedance with calibration data From: CK Hu To: Jitao Shi Date: Fri, 20 Dec 2019 10:31:29 +0800 In-Reply-To: <20191216082937.119164-5-jitao.shi@mediatek.com> References: <20191216082937.119164-1-jitao.shi@mediatek.com> <20191216082937.119164-5-jitao.shi@mediatek.com> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191219_183605_029415_84C672FE X-CRM114-Status: GOOD ( 16.26 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: bibby.hsieh@mediatek.com, srv_heupstream@mediatek.com, David Airlie , stonea168@163.com, cawa.cheng@mediatek.com, dri-devel@lists.freedesktop.org, sj.huang@mediatek.com, linux-mediatek@lists.infradead.org, Daniel Vetter , Matthias Brugger , yingjoe.chen@mediatek.com, eddie.huang@mediatek.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org Hi, Jitao: On Mon, 2019-12-16 at 16:29 +0800, Jitao Shi wrote: > Read calibration data from nvmem, and config mipitx impedance with > calibration data to make sure their impedance are 100ohm. > > Signed-off-by: Jitao Shi > --- > drivers/gpu/drm/mediatek/mtk_mipi_tx.h | 1 + > drivers/gpu/drm/mediatek/mtk_mt8183_mipi_tx.c | 63 +++++++++++++++++++ > 2 files changed, 64 insertions(+) > > diff --git a/drivers/gpu/drm/mediatek/mtk_mipi_tx.h b/drivers/gpu/drm/mediatek/mtk_mipi_tx.h > index eea44327fe9f..a1b6292145de 100644 > --- a/drivers/gpu/drm/mediatek/mtk_mipi_tx.h > +++ b/drivers/gpu/drm/mediatek/mtk_mipi_tx.h > @@ -28,6 +28,7 @@ struct mtk_mipi_tx { > void __iomem *regs; > u32 data_rate; > u32 mipitx_drive; > + u32 rt_code[5]; > const struct mtk_mipitx_data *driver_data; > struct clk_hw pll_hw; > struct clk *pll; > diff --git a/drivers/gpu/drm/mediatek/mtk_mt8183_mipi_tx.c b/drivers/gpu/drm/mediatek/mtk_mt8183_mipi_tx.c > index 124fdf95f1e5..f624516944bb 100644 > --- a/drivers/gpu/drm/mediatek/mtk_mt8183_mipi_tx.c > +++ b/drivers/gpu/drm/mediatek/mtk_mt8183_mipi_tx.c > @@ -5,6 +5,8 @@ > */ > > #include "mtk_mipi_tx.h" > +#include > +#include > > #define MIPITX_LANE_CON 0x000c > #define RG_DSI_CPHY_T1DRV_EN BIT(0) > @@ -28,6 +30,7 @@ > #define MIPITX_PLL_CON4 0x003c > #define RG_DSI_PLL_IBIAS (3 << 10) > > +#define MIPITX_D2P_RTCODE 0x0100 > #define MIPITX_D2_SW_CTL_EN 0x0144 > #define MIPITX_D0_SW_CTL_EN 0x0244 > #define MIPITX_CK_CKMODE_EN 0x0328 > @@ -108,6 +111,64 @@ static const struct clk_ops mtk_mipi_tx_pll_ops = { > .recalc_rate = mtk_mipi_tx_pll_recalc_rate, > }; > > +static int mtk_mipi_tx_config_calibration_data(struct mtk_mipi_tx *mipi_tx) > +{ > + u32 *buf = NULL; Need not to assign NULL to buf, it would be assigned some value later. > + int i, j; > + struct nvmem_cell *cell; > + struct device *dev = mipi_tx->dev; > + size_t len; > + > + cell = nvmem_cell_get(dev, "calibration-data"); > + if (IS_ERR(cell)) { > + dev_warn(dev, "nvmem_cell_get fail\n"); In [1], nvmem is optional property, so I think you should use dev_dbg() or dev_info(). [1] http://lists.infradead.org/pipermail/linux-mediatek/2019-December/025640.html > + return -EINVAL; The caller does not process return value, so I think you don't need to return value. > + } > + > + buf = (u32 *)nvmem_cell_read(cell, &len); > + > + nvmem_cell_put(cell); > + > + if (IS_ERR(buf)) { > + dev_warn(dev, "can't get data\n"); > + return -EINVAL; > + } > + > + if (len < 3 * sizeof(u32)) { > + dev_warn(dev, "invalid calibration data\n"); > + kfree(buf); > + return -EINVAL; > + } > + > + mipi_tx->rt_code[0] = ((buf[0] >> 6 & 0x1F) << 5) | You don't access rt_code[] out of this function, so I think this could be local variable. > + (buf[0] >> 11 & 0x1F); Lower case 0x1f. > + mipi_tx->rt_code[1] = ((buf[1] >> 27 & 0x1F) << 5) | > + (buf[0] >> 1 & 0x1F); > + mipi_tx->rt_code[2] = ((buf[1] >> 17 & 0x1F) << 5) | > + (buf[1] >> 22 & 0x1F); > + mipi_tx->rt_code[3] = ((buf[1] >> 7 & 0x1F) << 5) | > + (buf[1] >> 12 & 0x1F); > + mipi_tx->rt_code[4] = ((buf[2] >> 27 & 0x1F) << 5) | > + (buf[1] >> 2 & 0x1F); Why not just save rt_code in nvmem and you don't need to translate here? If you need to do so, please add description for this. > + > + for (i = 0; i < 5; i++) { > + if ((mipi_tx->rt_code[i] & 0x1F) == 0) > + mipi_tx->rt_code[i] |= 0x10; > + > + if ((mipi_tx->rt_code[i] >> 5 & 0x1F) == 0) > + mipi_tx->rt_code[i] |= 0x10 << 5; > + > + for (j = 0; j < 10; j++) { > + mtk_mipi_tx_update_bits(mipi_tx, > + MIPITX_D2P_RTCODE * (i + 1) + j * 4, > + 1, mipi_tx->rt_code[i] >> j & 1); > + } There is only one statement in for-loop, so you could get rid of {}. Regards, CK > + } > + > + kfree(buf); > + return 0; > +} > + > static void mtk_mipi_tx_power_on_signal(struct phy *phy) > { > struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy); > @@ -130,6 +191,8 @@ static void mtk_mipi_tx_power_on_signal(struct phy *phy) > RG_DSI_HSTX_LDO_REF_SEL, > mipi_tx->mipitx_drive << 6); > > + mtk_mipi_tx_config_calibration_data(mipi_tx); > + > mtk_mipi_tx_set_bits(mipi_tx, MIPITX_CK_CKMODE_EN, DSI_CK_CKMODE_EN); > } > _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek