From mboxrd@z Thu Jan 1 00:00:00 1970 From: Archit Taneja Subject: [RFC 2/2] drm/dsi: Get DSI host by DT device node Date: Tue, 30 Jun 2015 10:54:11 +0530 Message-ID: <1435641851-27295-3-git-send-email-architt@codeaurora.org> References: <1435641851-27295-1-git-send-email-architt@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <1435641851-27295-1-git-send-email-architt@codeaurora.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, a.hajda@samsung.com, treding@nvidia.com List-Id: linux-arm-msm@vger.kernel.org bWlwaV9kc2lfZGV2aWNlcyBhcmUgaW5oZXJlbnRseSBhd2FyZSBvZiB0aGVpciBob3N0IGJlY2F1 c2UgdGhleQpzaGFyZSBhIHBhcmVudC1jaGlsZCBoaWVyYXJjaHkgaW4gdGhlIGRldmljZSB0cmVl LgoKTm9uLWRzaSBkcml2ZXJzIHRoYXQgY3JlYXRlIGEgZHVtbXkgZHNpIGRldmljZSBkb24ndCBo YXZlIHRoaXMgZGF0YS4KSW4gb3JkZXIgdG8gZ2V0IHRoaXMgaW5mb3JtYXRpb24sIHRoZXkgcmVx dWlyZSB0byBhIHBoYW5kbGUgdG8gdGhlIGRzaQpob3N0IGluIHRoZSBkZXZpY2UgdHJlZS4KCk1h aW50YWluIGEgbGlzdCBvZiBhbGwgdGhlIGhvc3RzIERTSSB0aGF0IGFyZSBjdXJyZW50bHkgcmVn aXN0ZXJlZC4KClRoaXMgbGlzdCB3aWxsIGJlIHVzZWQgdG8gZmluZCB0aGUgbWlwaV9kc2lfaG9z dCBjb3JyZXNwb25kaW5nIHRvIHRoZQpkZXZpY2Vfbm9kZSBwYXNzZWQgaW4gb2ZfZmluZF9taXBp X2RzaV9ob3N0X2J5X25vZGUuCgpTaWduZWQtb2ZmLWJ5OiBBcmNoaXQgVGFuZWphIDxhcmNoaXR0 QGNvZGVhdXJvcmEub3JnPgotLS0KIGRyaXZlcnMvZ3B1L2RybS9kcm1fbWlwaV9kc2kuYyB8IDMw ICsrKysrKysrKysrKysrKysrKysrKysrKysrKysrKwogaW5jbHVkZS9kcm0vZHJtX21pcGlfZHNp LmggICAgIHwgIDIgKysKIDIgZmlsZXMgY2hhbmdlZCwgMzIgaW5zZXJ0aW9ucygrKQoKZGlmZiAt LWdpdCBhL2RyaXZlcnMvZ3B1L2RybS9kcm1fbWlwaV9kc2kuYyBiL2RyaXZlcnMvZ3B1L2RybS9k cm1fbWlwaV9kc2kuYwppbmRleCA5YmZlMjE1Li44MWRkYjczIDEwMDY0NAotLS0gYS9kcml2ZXJz L2dwdS9kcm0vZHJtX21pcGlfZHNpLmMKKysrIGIvZHJpdmVycy9ncHUvZHJtL2RybV9taXBpX2Rz aS5jCkBAIC0yMzksNiArMjM5LDI4IEBAIHN0cnVjdCBtaXBpX2RzaV9kZXZpY2UgKm1pcGlfZHNp X25ld19kdW1teShzdHJ1Y3QgbWlwaV9kc2lfaG9zdCAqaG9zdCwgdTMyIHJlZykKIAlyZXR1cm4g ZHNpOwogfQogCitzdGF0aWMgREVGSU5FX01VVEVYKGhvc3RfbG9jayk7CitzdGF0aWMgTElTVF9I RUFEKGhvc3RfbGlzdCk7CisKK3N0cnVjdCBtaXBpX2RzaV9ob3N0ICpvZl9maW5kX21pcGlfZHNp X2hvc3RfYnlfbm9kZShzdHJ1Y3QgZGV2aWNlX25vZGUgKm5vZGUpCit7CisJc3RydWN0IG1pcGlf ZHNpX2hvc3QgKmhvc3Q7CisKKwltdXRleF9sb2NrKCZob3N0X2xvY2spOworCisJbGlzdF9mb3Jf ZWFjaF9lbnRyeShob3N0LCAmaG9zdF9saXN0LCBsaXN0KSB7CisJCWlmIChob3N0LT5kZXYtPm9m X25vZGUgPT0gbm9kZSkgeworCQkJbXV0ZXhfdW5sb2NrKCZob3N0X2xvY2spOworCQkJcmV0dXJu IGhvc3Q7CisJCX0KKwl9CisKKwltdXRleF91bmxvY2soJmhvc3RfbG9jayk7CisKKwlyZXR1cm4g TlVMTDsKK30KK0VYUE9SVF9TWU1CT0wob2ZfZmluZF9taXBpX2RzaV9ob3N0X2J5X25vZGUpOwor CiBpbnQgbWlwaV9kc2lfaG9zdF9yZWdpc3RlcihzdHJ1Y3QgbWlwaV9kc2lfaG9zdCAqaG9zdCkK IHsKIAlzdHJ1Y3QgZGV2aWNlX25vZGUgKm5vZGU7CkBAIC0yNTAsNiArMjcyLDEwIEBAIGludCBt aXBpX2RzaV9ob3N0X3JlZ2lzdGVyKHN0cnVjdCBtaXBpX2RzaV9ob3N0ICpob3N0KQogCQlvZl9t aXBpX2RzaV9kZXZpY2VfYWRkKGhvc3QsIG5vZGUpOwogCX0KIAorCW11dGV4X2xvY2soJmhvc3Rf bG9jayk7CisJbGlzdF9hZGRfdGFpbCgmaG9zdC0+bGlzdCwgJmhvc3RfbGlzdCk7CisJbXV0ZXhf dW5sb2NrKCZob3N0X2xvY2spOworCiAJcmV0dXJuIDA7CiB9CiBFWFBPUlRfU1lNQk9MKG1pcGlf ZHNpX2hvc3RfcmVnaXN0ZXIpOwpAQCAtMjY2LDYgKzI5MiwxMCBAQCBzdGF0aWMgaW50IG1pcGlf ZHNpX3JlbW92ZV9kZXZpY2VfZm4oc3RydWN0IGRldmljZSAqZGV2LCB2b2lkICpwcml2KQogdm9p ZCBtaXBpX2RzaV9ob3N0X3VucmVnaXN0ZXIoc3RydWN0IG1pcGlfZHNpX2hvc3QgKmhvc3QpCiB7 CiAJZGV2aWNlX2Zvcl9lYWNoX2NoaWxkKGhvc3QtPmRldiwgTlVMTCwgbWlwaV9kc2lfcmVtb3Zl X2RldmljZV9mbik7CisKKwltdXRleF9sb2NrKCZob3N0X2xvY2spOworCWxpc3RfZGVsX2luaXQo Jmhvc3QtPmxpc3QpOworCW11dGV4X3VubG9jaygmaG9zdF9sb2NrKTsKIH0KIEVYUE9SVF9TWU1C T0wobWlwaV9kc2lfaG9zdF91bnJlZ2lzdGVyKTsKIApkaWZmIC0tZ2l0IGEvaW5jbHVkZS9kcm0v ZHJtX21pcGlfZHNpLmggYi9pbmNsdWRlL2RybS9kcm1fbWlwaV9kc2kuaAppbmRleCBkMDZiYTk5 Li4xNjg0YTBlIDEwMDY0NAotLS0gYS9pbmNsdWRlL2RybS9kcm1fbWlwaV9kc2kuaAorKysgYi9p bmNsdWRlL2RybS9kcm1fbWlwaV9kc2kuaApAQCAtMTAwLDEwICsxMDAsMTIgQEAgc3RydWN0IG1p cGlfZHNpX2hvc3Rfb3BzIHsKIHN0cnVjdCBtaXBpX2RzaV9ob3N0IHsKIAlzdHJ1Y3QgZGV2aWNl ICpkZXY7CiAJY29uc3Qgc3RydWN0IG1pcGlfZHNpX2hvc3Rfb3BzICpvcHM7CisJc3RydWN0IGxp c3RfaGVhZCBsaXN0OwogfTsKIAogaW50IG1pcGlfZHNpX2hvc3RfcmVnaXN0ZXIoc3RydWN0IG1p cGlfZHNpX2hvc3QgKmhvc3QpOwogdm9pZCBtaXBpX2RzaV9ob3N0X3VucmVnaXN0ZXIoc3RydWN0 IG1pcGlfZHNpX2hvc3QgKmhvc3QpOworc3RydWN0IG1pcGlfZHNpX2hvc3QgKm9mX2ZpbmRfbWlw aV9kc2lfaG9zdF9ieV9ub2RlKHN0cnVjdCBkZXZpY2Vfbm9kZSAqbm9kZSk7CiAKIC8qIERTSSBt b2RlIGZsYWdzICovCiAKLS0gClRoZSBRdWFsY29tbSBJbm5vdmF0aW9uIENlbnRlciwgSW5jLiBp cyBhIG1lbWJlciBvZiB0aGUgQ29kZSBBdXJvcmEgRm9ydW0sCmhvc3RlZCBieSBUaGUgTGludXgg Rm91bmRhdGlvbgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X18KZHJpLWRldmVsIG1haWxpbmcgbGlzdApkcmktZGV2ZWxAbGlzdHMuZnJlZWRlc2t0b3Aub3Jn Cmh0dHA6Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0aW5mby9kcmktZGV2ZWwK From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753866AbbF3FYg (ORCPT ); Tue, 30 Jun 2015 01:24:36 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:43664 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753779AbbF3FY0 (ORCPT ); Tue, 30 Jun 2015 01:24:26 -0400 From: Archit Taneja To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, treding@nvidia.com, inki.dae@samsung.com, a.hajda@samsung.com, linux-kernel@vger.kernel.org, airlied@linux.ie, daniel@ffwll.ch, jani.nikula@linux.intel.com, Archit Taneja Subject: [RFC 2/2] drm/dsi: Get DSI host by DT device node Date: Tue, 30 Jun 2015 10:54:11 +0530 Message-Id: <1435641851-27295-3-git-send-email-architt@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1435641851-27295-1-git-send-email-architt@codeaurora.org> References: <1435641851-27295-1-git-send-email-architt@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org mipi_dsi_devices are inherently aware of their host because they share a parent-child hierarchy in the device tree. Non-dsi drivers that create a dummy dsi device don't have this data. In order to get this information, they require to a phandle to the dsi host in the device tree. Maintain a list of all the hosts DSI that are currently registered. This list will be used to find the mipi_dsi_host corresponding to the device_node passed in of_find_mipi_dsi_host_by_node. Signed-off-by: Archit Taneja --- drivers/gpu/drm/drm_mipi_dsi.c | 30 ++++++++++++++++++++++++++++++ include/drm/drm_mipi_dsi.h | 2 ++ 2 files changed, 32 insertions(+) diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c index 9bfe215..81ddb73 100644 --- a/drivers/gpu/drm/drm_mipi_dsi.c +++ b/drivers/gpu/drm/drm_mipi_dsi.c @@ -239,6 +239,28 @@ struct mipi_dsi_device *mipi_dsi_new_dummy(struct mipi_dsi_host *host, u32 reg) return dsi; } +static DEFINE_MUTEX(host_lock); +static LIST_HEAD(host_list); + +struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node) +{ + struct mipi_dsi_host *host; + + mutex_lock(&host_lock); + + list_for_each_entry(host, &host_list, list) { + if (host->dev->of_node == node) { + mutex_unlock(&host_lock); + return host; + } + } + + mutex_unlock(&host_lock); + + return NULL; +} +EXPORT_SYMBOL(of_find_mipi_dsi_host_by_node); + int mipi_dsi_host_register(struct mipi_dsi_host *host) { struct device_node *node; @@ -250,6 +272,10 @@ int mipi_dsi_host_register(struct mipi_dsi_host *host) of_mipi_dsi_device_add(host, node); } + mutex_lock(&host_lock); + list_add_tail(&host->list, &host_list); + mutex_unlock(&host_lock); + return 0; } EXPORT_SYMBOL(mipi_dsi_host_register); @@ -266,6 +292,10 @@ static int mipi_dsi_remove_device_fn(struct device *dev, void *priv) void mipi_dsi_host_unregister(struct mipi_dsi_host *host) { device_for_each_child(host->dev, NULL, mipi_dsi_remove_device_fn); + + mutex_lock(&host_lock); + list_del_init(&host->list); + mutex_unlock(&host_lock); } EXPORT_SYMBOL(mipi_dsi_host_unregister); diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h index d06ba99..1684a0e 100644 --- a/include/drm/drm_mipi_dsi.h +++ b/include/drm/drm_mipi_dsi.h @@ -100,10 +100,12 @@ struct mipi_dsi_host_ops { struct mipi_dsi_host { struct device *dev; const struct mipi_dsi_host_ops *ops; + struct list_head list; }; int mipi_dsi_host_register(struct mipi_dsi_host *host); void mipi_dsi_host_unregister(struct mipi_dsi_host *host); +struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node); /* DSI mode flags */ -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation