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Sun, 24 May 2020 18:31:32 -0800 Received: from mtkmbs05n1.mediatek.inc (172.21.101.15) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Sun, 24 May 2020 19:27:02 -0700 Received: from MTKCAS06.mediatek.inc (172.21.101.30) by mtkmbs05n1.mediatek.inc (172.21.101.15) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 25 May 2020 10:27:00 +0800 Received: from [172.21.77.33] (172.21.77.33) by MTKCAS06.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Mon, 25 May 2020 10:27:00 +0800 Message-ID: <1590373621.31522.7.camel@mtkswgap22> Subject: Re: [PATCH v5 09/13] soc: mediatek: cmdq: add write_s value function From: Dennis-YC Hsieh To: Matthias Brugger Date: Mon, 25 May 2020 10:27:01 +0800 In-Reply-To: References: <1583664775-19382-1-git-send-email-dennis-yc.hsieh@mediatek.com> <1583664775-19382-10-git-send-email-dennis-yc.hsieh@mediatek.com> <1590341462.31286.19.camel@mtkswgap22> X-Mailer: Evolution 3.2.3-0ubuntu6 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200524_193141_638558_17FCD0BC X-CRM114-Status: GOOD ( 20.72 ) 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: Mark Rutland , devicetree@vger.kernel.org, Philipp Zabel , wsd_upstream@mediatek.com, David Airlie , Jassi Brar , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, HS Liao , Rob Herring , linux-mediatek@lists.infradead.org, Houlong Wei , Daniel Vetter , CK Hu , Bibby Hsieh , linux-arm-kernel@lists.infradead.org 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 On Sun, 2020-05-24 at 20:13 +0200, Matthias Brugger wrote: > > On 24/05/2020 19:31, Dennis-YC Hsieh wrote: > > Hi Matthias, > > > > Thanks for your comment. > > > > On Sat, 2020-05-16 at 20:20 +0200, Matthias Brugger wrote: > >> > >> On 08/03/2020 11:52, Dennis YC Hsieh wrote: > >>> add write_s function in cmdq helper functions which > >>> writes a constant value to address with large dma > >>> access support. > >>> > >>> Signed-off-by: Dennis YC Hsieh > >>> Reviewed-by: CK Hu > >>> --- > >>> drivers/soc/mediatek/mtk-cmdq-helper.c | 26 ++++++++++++++++++++++++++ > >>> include/linux/soc/mediatek/mtk-cmdq.h | 14 ++++++++++++++ > >>> 2 files changed, 40 insertions(+) > >>> > >>> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c > >>> index 03c129230cd7..a9ebbabb7439 100644 > >>> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c > >>> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c > >>> @@ -269,6 +269,32 @@ int cmdq_pkt_write_s(struct cmdq_pkt *pkt, u16 high_addr_reg_idx, > >>> } > >>> EXPORT_SYMBOL(cmdq_pkt_write_s); > >>> > >>> +int cmdq_pkt_write_s_value(struct cmdq_pkt *pkt, u16 high_addr_reg_idx, > >>> + u16 addr_low, u32 value, u32 mask) > >>> +{ > >>> + struct cmdq_instruction inst = { {0} }; > >>> + int err; > >>> + > >>> + if (mask != U32_MAX) { > >>> + inst.op = CMDQ_CODE_MASK; > >>> + inst.mask = ~mask; > >>> + err = cmdq_pkt_append_command(pkt, inst); > >>> + if (err < 0) > >>> + return err; > >>> + > >>> + inst.op = CMDQ_CODE_WRITE_S_MASK; > >>> + } else { > >>> + inst.op = CMDQ_CODE_WRITE_S; > >>> + } > >>> + > >>> + inst.sop = high_addr_reg_idx; > >> > >> Writing u16 value in a 5 bit wide variable? > > > > We need only 5 bits in this case. I'll change high_addr_reg_idx > > parameter to u8. > > > > Ok, please make sure to mask the value, so that it's explicit in the code that > we only use the lowest 5 bits of high_addr_reg_idx. Is it necessary to mask the value? Since sop already defined as "u8 sop:5;", I thought it is explicit that only use 5 bits and compiler should do the rest jobs. Regards, Dennis > > Regards, > Matthias > > >> > >>> + inst.offset = addr_low; > >>> + inst.value = value; > >>> + > >>> + return cmdq_pkt_append_command(pkt, inst); > >>> +} > >>> +EXPORT_SYMBOL(cmdq_pkt_write_s_value); > >>> + > >>> int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event) > >>> { > >>> struct cmdq_instruction inst = { {0} }; > >>> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h > >>> index 01b4184af310..fec292aac83c 100644 > >>> --- a/include/linux/soc/mediatek/mtk-cmdq.h > >>> +++ b/include/linux/soc/mediatek/mtk-cmdq.h > >>> @@ -135,6 +135,20 @@ int cmdq_pkt_read_s(struct cmdq_pkt *pkt, u16 high_addr_reg_idx, u16 addr_low, > >>> int cmdq_pkt_write_s(struct cmdq_pkt *pkt, u16 high_addr_reg_idx, > >>> u16 addr_low, u16 src_reg_idx, u32 mask); > >>> > >>> +/** > >>> + * cmdq_pkt_write_s_value() - append write_s command with mask to the CMDQ > >>> + * packet which write value to a physical address > >>> + * @pkt: the CMDQ packet > >>> + * @high_addr_reg_idx: internal regisger ID which contains high address of pa > >> > >> register > > > > will fix > > > > > > Regards, > > Dennis > > > >> > >>> + * @addr_low: low address of pa > >>> + * @value: the specified target value > >>> + * @mask: the specified target mask > >>> + * > >>> + * Return: 0 for success; else the error code is returned > >>> + */ > >>> +int cmdq_pkt_write_s_value(struct cmdq_pkt *pkt, u16 high_addr_reg_idx, > >>> + u16 addr_low, u32 value, u32 mask); > >>> + > >>> /** > >>> * cmdq_pkt_wfe() - append wait for event command to the CMDQ packet > >>> * @pkt: the CMDQ packet > >>> > > _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek