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Mon, 06 Jan 2025 00:49:14 -0800 (PST) From: Krzysztof Kozlowski Date: Mon, 06 Jan 2025 09:49:04 +0100 Subject: [PATCH 1/4] drm/msm/dsi: Drop redundant NULL-ifying of clocks on error paths Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250106-drm-msm-cleanups-v1-1-271ff1c00795@linaro.org> References: <20250106-drm-msm-cleanups-v1-0-271ff1c00795@linaro.org> In-Reply-To: <20250106-drm-msm-cleanups-v1-0-271ff1c00795@linaro.org> To: Rob Clark , Abhinav Kumar , Dmitry Baryshkov , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, Krzysztof Kozlowski X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1610; i=krzysztof.kozlowski@linaro.org; h=from:subject:message-id; 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Therefore NULL-ifying specific clocks is pointless and redundant - the PTR_ERR value stored there won't be used/dereferenced afterwards. What's more, variant-specific clock init calls like dsi_clk_init_6g_v2() are not doing this cleanup. Dropping redundant code allows later to make this a bit simpler. Signed-off-by: Krzysztof Kozlowski Reviewed-by: Abhinav Kumar --- drivers/gpu/drm/msm/dsi/dsi_host.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/d= si_host.c index a98d24b7cb00b41d3bb371a965a80ceaa93775a6..86ac145076416fa7651d1882026= 6a00d28e44b6f 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -292,7 +292,6 @@ static int dsi_clk_init(struct msm_dsi_host *msm_host) ret =3D PTR_ERR(msm_host->byte_clk); pr_err("%s: can't find dsi_byte clock. ret=3D%d\n", __func__, ret); - msm_host->byte_clk =3D NULL; goto exit; } =20 @@ -301,7 +300,6 @@ static int dsi_clk_init(struct msm_dsi_host *msm_host) ret =3D PTR_ERR(msm_host->pixel_clk); pr_err("%s: can't find dsi_pixel clock. ret=3D%d\n", __func__, ret); - msm_host->pixel_clk =3D NULL; goto exit; } =20 @@ -310,7 +308,6 @@ static int dsi_clk_init(struct msm_dsi_host *msm_host) ret =3D PTR_ERR(msm_host->esc_clk); pr_err("%s: can't find dsi_esc clock. ret=3D%d\n", __func__, ret); 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Mon, 06 Jan 2025 00:49:15 -0800 (PST) From: Krzysztof Kozlowski Date: Mon, 06 Jan 2025 09:49:05 +0100 Subject: [PATCH 2/4] drm/msm/dsi: Simplify with dev_err_probe() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250106-drm-msm-cleanups-v1-2-271ff1c00795@linaro.org> References: <20250106-drm-msm-cleanups-v1-0-271ff1c00795@linaro.org> In-Reply-To: <20250106-drm-msm-cleanups-v1-0-271ff1c00795@linaro.org> To: Rob Clark , Abhinav Kumar , Dmitry Baryshkov , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, Krzysztof Kozlowski X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=6526; i=krzysztof.kozlowski@linaro.org; h=from:subject:message-id; bh=lYvt5NktykrU4G4k710RiF9T2No7atg8/NYgEiARUDI=; b=owEBbQKS/ZANAwAKAcE3ZuaGi4PXAcsmYgBne5kFeF66qxefqCkeKAcrKm6G/RWzKa1Lo5O6x 9gKuZfWWj+JAjMEAAEKAB0WIQTd0mIoPREbIztuuKjBN2bmhouD1wUCZ3uZBQAKCRDBN2bmhouD 13A/EACCArEJHarifsC36OvyaQw2iWP5JpsdZKyCO79MFzugRGcxQEyzTiD76HWcoC2bprBXWcV mC0MtsPseAqH8bFRdpYIBGM7Y4Gf47s2G7MRykpCTKhr9LcSYj2IxGGsnGCziJG5v7T5iemwMAj uYvAFEnrvcS4mkVUxOzB6aJpEL+DbC3XXtRtx7rdH0/15gEPtcq11hJaxmzSeZ5QJPXnQEqc+Xb NBKKOsaO+nafD0HpK3UhrlpuSP8T6TNcuz3k1VO4RxYHAmUmcwYhChjpt/3IstlyS8RG79pNfXV jRYO9X2LnBPaa4QgNLk2FwUsKZyieP5oKqpc043UtKAyUrnqEP7JI3dvhnjt9AlgKKaDM410eO/ wEAzzv67SOIy1MwMh5N68UjcjM6ukxTOnhHw/SUuGPs9LT958aaavKh6vWif7xZWbzWl154Td72 qbm6cvOdJnltxlMSbzrw/R3OjcgUuwiSO92rmaFCXSPUUHgLmHyHxrpFwdHbCD/TYtki7Kuh00L EOAa5y4hs1Sth9fQ59nLsuEz4VEEG/HutyLPpsBNDuoxCdqFQs5R1ek7df1WcGBynYvKkOMpFJs QkIo8A83bTFKTMrh2plnrqA4ecPm+yTmDArVLXlrz1bvCXWrslhUr+1g52EsmMbbccfH/OO6Yj8 W5cpQ0NNLsNjBUQ== X-Developer-Key: i=krzysztof.kozlowski@linaro.org; a=openpgp; fpr=9BD07E0E0C51F8D59677B7541B93437D3B41629B dsi_clk_init() and msm_dsi_host_init() are called only from platform driver probe function, so using dev_err_probe is both appropriate and beneficial: - Properly marks device deferred probe status, - Avoids dmesg flood on probe deferrals, - Already incorporates printing ERR value, - Shows device name (in contrast to pr_err()), - Makes code smaller and simpler. Signed-off-by: Krzysztof Kozlowski Reviewed-by: Abhinav Kumar --- drivers/gpu/drm/msm/dsi/dsi_host.c | 100 +++++++++++++++------------------= ---- 1 file changed, 41 insertions(+), 59 deletions(-) diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/d= si_host.c index 86ac145076416fa7651d18820266a00d28e44b6f..4a2ad04eea7359545a088bdc639= 07f6b3e5615bd 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -200,7 +200,8 @@ static const struct msm_dsi_cfg_handler *dsi_get_config( =20 ahb_clk =3D msm_clk_get(msm_host->pdev, "iface"); if (IS_ERR(ahb_clk)) { - pr_err("%s: cannot get interface clock\n", __func__); + dev_err_probe(dev, PTR_ERR(ahb_clk), "%s: cannot get interface clock\n", + __func__); goto exit; } =20 @@ -208,13 +209,13 @@ static const struct msm_dsi_cfg_handler *dsi_get_conf= ig( =20 ret =3D clk_prepare_enable(ahb_clk); if (ret) { - pr_err("%s: unable to enable ahb_clk\n", __func__); + dev_err_probe(dev, ret, "%s: unable to enable ahb_clk\n", __func__); goto runtime_put; } =20 ret =3D dsi_get_version(msm_host->ctrl_base, &major, &minor); if (ret) { - pr_err("%s: Invalid version\n", __func__); + dev_err_probe(dev, ret, "%s: Invalid version\n", __func__); goto disable_clks; } =20 @@ -281,39 +282,31 @@ static int dsi_clk_init(struct msm_dsi_host *msm_host) msm_host->num_bus_clks =3D cfg->num_bus_clks; =20 ret =3D devm_clk_bulk_get(&pdev->dev, msm_host->num_bus_clks, msm_host->b= us_clks); - if (ret < 0) { - dev_err(&pdev->dev, "Unable to get clocks, ret =3D %d\n", ret); - goto exit; - } + if (ret < 0) + return dev_err_probe(&pdev->dev, ret, "Unable to get clocks\n"); =20 /* get link and source clocks */ msm_host->byte_clk =3D msm_clk_get(pdev, "byte"); - if (IS_ERR(msm_host->byte_clk)) { - ret =3D PTR_ERR(msm_host->byte_clk); - pr_err("%s: can't find dsi_byte clock. ret=3D%d\n", - __func__, ret); - goto exit; - } + if (IS_ERR(msm_host->byte_clk)) + return dev_err_probe(&pdev->dev, PTR_ERR(msm_host->byte_clk), + "%s: can't find dsi_byte clock\n", + __func__); =20 msm_host->pixel_clk =3D msm_clk_get(pdev, "pixel"); - if (IS_ERR(msm_host->pixel_clk)) { - ret =3D PTR_ERR(msm_host->pixel_clk); - pr_err("%s: can't find dsi_pixel clock. ret=3D%d\n", - __func__, ret); - goto exit; - } + if (IS_ERR(msm_host->pixel_clk)) + return dev_err_probe(&pdev->dev, PTR_ERR(msm_host->pixel_clk), + "%s: can't find dsi_pixel clock\n", + __func__); =20 msm_host->esc_clk =3D msm_clk_get(pdev, "core"); - if (IS_ERR(msm_host->esc_clk)) { - ret =3D PTR_ERR(msm_host->esc_clk); - pr_err("%s: can't find dsi_esc clock. ret=3D%d\n", - __func__, ret); - goto exit; - } + if (IS_ERR(msm_host->esc_clk)) + return dev_err_probe(&pdev->dev, PTR_ERR(msm_host->esc_clk), + "%s: can't find dsi_esc clock\n", + __func__); =20 if (cfg_hnd->ops->clk_init_ver) ret =3D cfg_hnd->ops->clk_init_ver(msm_host); -exit: + return ret; } =20 @@ -1879,31 +1872,28 @@ int msm_dsi_host_init(struct msm_dsi *msm_dsi) msm_dsi->host =3D &msm_host->base; =20 ret =3D dsi_host_parse_dt(msm_host); - if (ret) { - pr_err("%s: failed to parse dt\n", __func__); - return ret; - } + if (ret) + return dev_err_probe(&pdev->dev, ret, "%s: failed to parse dt\n", + __func__); =20 msm_host->ctrl_base =3D msm_ioremap_size(pdev, "dsi_ctrl", &msm_host->ctr= l_size); - if (IS_ERR(msm_host->ctrl_base)) { - pr_err("%s: unable to map Dsi ctrl base\n", __func__); - return PTR_ERR(msm_host->ctrl_base); - } + if (IS_ERR(msm_host->ctrl_base)) + return dev_err_probe(&pdev->dev, PTR_ERR(msm_host->ctrl_base), + "%s: unable to map Dsi ctrl base\n", __func__); =20 pm_runtime_enable(&pdev->dev); =20 msm_host->cfg_hnd =3D dsi_get_config(msm_host); - if (!msm_host->cfg_hnd) { - pr_err("%s: get config failed\n", __func__); - return -EINVAL; - } + if (!msm_host->cfg_hnd) + return dev_err_probe(&pdev->dev, -EINVAL, + "%s: get config failed\n", __func__); cfg =3D msm_host->cfg_hnd->cfg; =20 msm_host->id =3D dsi_host_get_id(msm_host); - if (msm_host->id < 0) { - pr_err("%s: unable to identify DSI host index\n", __func__); - return msm_host->id; - } + if (msm_host->id < 0) + return dev_err_probe(&pdev->dev, msm_host->id, + "%s: unable to identify DSI host index\n", + __func__); =20 /* fixup base address by io offset */ msm_host->ctrl_base +=3D cfg->io_offset; @@ -1915,10 +1905,8 @@ int msm_dsi_host_init(struct msm_dsi *msm_dsi) return ret; =20 ret =3D dsi_clk_init(msm_host); - if (ret) { - pr_err("%s: unable to initialize dsi clks\n", __func__); - return ret; - } + if (ret) + return dev_err_probe(&pdev->dev, ret, "%s: unable to initialize dsi clks= \n", __func__); =20 msm_host->rx_buf =3D devm_kzalloc(&pdev->dev, SZ_4K, GFP_KERNEL); if (!msm_host->rx_buf) { @@ -1931,26 +1919,20 @@ int msm_dsi_host_init(struct msm_dsi *msm_dsi) return ret; /* OPP table is optional */ ret =3D devm_pm_opp_of_add_table(&pdev->dev); - if (ret && ret !=3D -ENODEV) { - dev_err(&pdev->dev, "invalid OPP table in device tree\n"); - return ret; - } + if (ret && ret !=3D -ENODEV) + return dev_err_probe(&pdev->dev, ret, "invalid OPP table in device tree\= n"); =20 msm_host->irq =3D irq_of_parse_and_map(pdev->dev.of_node, 0); - if (!msm_host->irq) { - dev_err(&pdev->dev, "failed to get irq\n"); 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a=openpgp; fpr=9BD07E0E0C51F8D59677B7541B93437D3B41629B Cleanup few obvious kernel coding style violations: missing or unnecessary braces in 'if-else', unnecessary break lines, incorrect breaking of long function declarations, unnecessary 'else' after a 'return'. No functional impact expected. Signed-off-by: Krzysztof Kozlowski Reviewed-by: Abhinav Kumar --- drivers/gpu/drm/msm/dsi/dsi_host.c | 51 +++++++++++++++++++---------------= ---- 1 file changed, 26 insertions(+), 25 deletions(-) diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/d= si_host.c index 4a2ad04eea7359545a088bdc63907f6b3e5615bd..a3c344b75fc2e90923cd6d26df8= 7b7c05208f736 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -179,18 +179,18 @@ struct msm_dsi_host { int irq; }; =20 - static inline u32 dsi_read(struct msm_dsi_host *msm_host, u32 reg) { return readl(msm_host->ctrl_base + reg); } + static inline void dsi_write(struct msm_dsi_host *msm_host, u32 reg, u32 d= ata) { writel(data, msm_host->ctrl_base + reg); } =20 -static const struct msm_dsi_cfg_handler *dsi_get_config( - struct msm_dsi_host *msm_host) +static const struct msm_dsi_cfg_handler * +dsi_get_config(struct msm_dsi_host *msm_host) { const struct msm_dsi_cfg_handler *cfg_hnd =3D NULL; struct device *dev =3D &msm_host->pdev->dev; @@ -370,7 +370,6 @@ int dsi_link_clk_set_rate_6g(struct msm_dsi_host *msm_h= ost) return 0; } =20 - int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host) { int ret; @@ -588,7 +587,6 @@ static void dsi_calc_pclk(struct msm_dsi_host *msm_host= , bool is_bonded_dsi) =20 DBG("pclk=3D%lu, bclk=3D%lu", msm_host->pixel_clk_rate, msm_host->byte_clk_rate); - } =20 int dsi_calc_clk_rate_6g(struct msm_dsi_host *msm_host, bool is_bonded_dsi) @@ -677,8 +675,8 @@ static inline enum dsi_traffic_mode dsi_get_traffic_mod= e(const u32 mode_flags) return NON_BURST_SYNCH_EVENT; } =20 -static inline enum dsi_vid_dst_format dsi_get_vid_fmt( - const enum mipi_dsi_pixel_format mipi_fmt) +static inline enum dsi_vid_dst_format +dsi_get_vid_fmt(const enum mipi_dsi_pixel_format mipi_fmt) { switch (mipi_fmt) { case MIPI_DSI_FMT_RGB888: return VID_DST_FORMAT_RGB888; @@ -689,8 +687,8 @@ static inline enum dsi_vid_dst_format dsi_get_vid_fmt( } } =20 -static inline enum dsi_cmd_dst_format dsi_get_cmd_fmt( - const enum mipi_dsi_pixel_format mipi_fmt) +static inline enum dsi_cmd_dst_format +dsi_get_cmd_fmt(const enum mipi_dsi_pixel_format mipi_fmt) { switch (mipi_fmt) { case MIPI_DSI_FMT_RGB888: return CMD_DST_FORMAT_RGB888; @@ -1282,14 +1280,15 @@ static int dsi_cmd_dma_add(struct msm_dsi_host *msm= _host, static int dsi_short_read1_resp(u8 *buf, const struct mipi_dsi_msg *msg) { u8 *data =3D msg->rx_buf; + if (data && (msg->rx_len >=3D 1)) { *data =3D buf[1]; /* strip out dcs type */ return 1; - } else { - pr_err("%s: read data does not match with rx_buf len %zu\n", - __func__, msg->rx_len); - return -EINVAL; } + + pr_err("%s: read data does not match with rx_buf len %zu\n", + __func__, msg->rx_len); + return -EINVAL; } =20 /* @@ -1298,15 +1297,16 @@ static int dsi_short_read1_resp(u8 *buf, const stru= ct mipi_dsi_msg *msg) static int dsi_short_read2_resp(u8 *buf, const struct mipi_dsi_msg *msg) { u8 *data =3D msg->rx_buf; + if (data && (msg->rx_len >=3D 2)) { data[0] =3D buf[1]; /* strip out dcs type */ data[1] =3D buf[2]; return 2; - } else { - pr_err("%s: read data does not match with rx_buf len %zu\n", - __func__, msg->rx_len); - return -EINVAL; } + + pr_err("%s: read data does not match with rx_buf len %zu\n", + __func__, msg->rx_len); + return -EINVAL; } =20 static int dsi_long_read_resp(u8 *buf, const struct mipi_dsi_msg *msg) @@ -1366,8 +1366,9 @@ static int dsi_cmd_dma_tx(struct msm_dsi_host *msm_ho= st, int len) ret =3D -ETIMEDOUT; else ret =3D len; - } else + } else { ret =3D len; + } =20 return ret; } @@ -1435,11 +1436,12 @@ static int dsi_cmds2buf_tx(struct msm_dsi_host *msm= _host, return len; } =20 - /* for video mode, do not send cmds more than - * one pixel line, since it only transmit it - * during BLLP. - */ - /* TODO: if the command is sent in LP mode, the bit rate is only + /* + * for video mode, do not send cmds more than + * one pixel line, since it only transmit it + * during BLLP. + * + * TODO: if the command is sent in LP mode, the bit rate is only * half of esc clk rate. 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Mon, 06 Jan 2025 00:49:19 -0800 (PST) Received: from [127.0.1.1] ([178.197.223.165]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-aac0e82f1d2sm2222112466b.11.2025.01.06.00.49.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Jan 2025 00:49:18 -0800 (PST) From: Krzysztof Kozlowski Date: Mon, 06 Jan 2025 09:49:07 +0100 Subject: [PATCH 4/4] drm/msm/dsi: Drop unnecessary -ENOMEM message Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250106-drm-msm-cleanups-v1-4-271ff1c00795@linaro.org> References: <20250106-drm-msm-cleanups-v1-0-271ff1c00795@linaro.org> In-Reply-To: <20250106-drm-msm-cleanups-v1-0-271ff1c00795@linaro.org> To: Rob Clark , Abhinav Kumar , Dmitry Baryshkov , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, Krzysztof Kozlowski X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; 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a=openpgp; fpr=9BD07E0E0C51F8D59677B7541B93437D3B41629B Kernel core already prints detailed report about memory allocation failures, so drivers should not have their own error messages. Signed-off-by: Krzysztof Kozlowski Reviewed-by: Abhinav Kumar --- drivers/gpu/drm/msm/dsi/dsi_host.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/d= si_host.c index a3c344b75fc2e90923cd6d26df87b7c05208f736..ab5d6fd53972f62307b0c5b801c= ca8b2394c5556 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -1910,10 +1910,8 @@ int msm_dsi_host_init(struct msm_dsi *msm_dsi) return dev_err_probe(&pdev->dev, ret, "%s: unable to initialize dsi clks= \n", __func__); =20 msm_host->rx_buf =3D devm_kzalloc(&pdev->dev, SZ_4K, GFP_KERNEL); - if (!msm_host->rx_buf) { - pr_err("%s: alloc rx temp buf failed\n", __func__); + if (!msm_host->rx_buf) return -ENOMEM; - } =20 ret =3D devm_pm_opp_set_clkname(&pdev->dev, "byte"); if (ret) --=20 2.43.0