| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <87429327-5d2e-e3f3-db22-04e225a31055@gmail.com>
Date: Wed, 22 Jul 2020 17:38:26 +0200
From: Matthias Brugger <matthias.bgg@...il.com>
To: Qii Wang <qii.wang@...iatek.com>, wsa@...-dreams.de
Cc: qiangming.xia@...iatek.com, devicetree@...r.kernel.org,
srv_heupstream@...iatek.com, leilk.liu@...iatek.com,
linux-kernel@...r.kernel.org, robh+dt@...nel.org,
linux-mediatek@...ts.infradead.org, linux-i2c@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/4] i2c: mediatek: Support DMA mask range over 33-bits
On 22/07/2020 14:31, Qii Wang wrote:
> Replace 'support_33bits with 'dma_max_support' for DMA mask
> operation, and replace 'mtk_i2c_set_4g_mode' with 'upper_32_bits'.
Please explain more in detail what you are doing and how this fits to the way
the HW works.
>
> Signed-off-by: Qii Wang <qii.wang@...iatek.com>
> ---
> drivers/i2c/busses/i2c-mt65xx.c | 37 +++++++++++++++++--------------------
> 1 file changed, 17 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c
> index e6b984a..e475877 100644
> --- a/drivers/i2c/busses/i2c-mt65xx.c
> +++ b/drivers/i2c/busses/i2c-mt65xx.c
> @@ -209,6 +209,7 @@ struct mtk_i2c_compatible {
> unsigned char dma_sync: 1;
> unsigned char ltiming_adjust: 1;
> unsigned char apdma_sync: 1;
> + unsigned char max_dma_support;
> };
>
> struct mtk_i2c_ac_timing {
> @@ -311,11 +312,11 @@ struct i2c_spec_values {
> .dcm = 1,
> .auto_restart = 1,
> .aux_len_reg = 1,
> - .support_33bits = 1,
> .timing_adjust = 1,
> .dma_sync = 0,
> .ltiming_adjust = 0,
> .apdma_sync = 0,
> + .max_dma_support = 33,
> };
>
> static const struct mtk_i2c_compatible mt6577_compat = {
> @@ -325,11 +326,11 @@ struct i2c_spec_values {
> .dcm = 1,
> .auto_restart = 0,
> .aux_len_reg = 0,
> - .support_33bits = 0,
> .timing_adjust = 0,
> .dma_sync = 0,
> .ltiming_adjust = 0,
> .apdma_sync = 0,
> + .max_dma_support = 32,
> };
>
> static const struct mtk_i2c_compatible mt6589_compat = {
> @@ -339,11 +340,11 @@ struct i2c_spec_values {
> .dcm = 0,
> .auto_restart = 0,
> .aux_len_reg = 0,
> - .support_33bits = 0,
> .timing_adjust = 0,
> .dma_sync = 0,
> .ltiming_adjust = 0,
> .apdma_sync = 0,
> + .max_dma_support = 32,
> };
>
> static const struct mtk_i2c_compatible mt7622_compat = {
> @@ -353,11 +354,11 @@ struct i2c_spec_values {
> .dcm = 1,
> .auto_restart = 1,
> .aux_len_reg = 1,
> - .support_33bits = 0,
> .timing_adjust = 0,
> .dma_sync = 0,
> .ltiming_adjust = 0,
> .apdma_sync = 0,
> + .max_dma_support = 32,
> };
>
> static const struct mtk_i2c_compatible mt8173_compat = {
> @@ -366,11 +367,11 @@ struct i2c_spec_values {
> .dcm = 1,
> .auto_restart = 1,
> .aux_len_reg = 1,
> - .support_33bits = 1,
> .timing_adjust = 0,
> .dma_sync = 0,
> .ltiming_adjust = 0,
> .apdma_sync = 0,
> + .max_dma_support = 33,
> };
>
> static const struct mtk_i2c_compatible mt8183_compat = {
> @@ -380,11 +381,11 @@ struct i2c_spec_values {
> .dcm = 0,
> .auto_restart = 1,
> .aux_len_reg = 1,
> - .support_33bits = 1,
> .timing_adjust = 1,
> .dma_sync = 1,
> .ltiming_adjust = 1,
> .apdma_sync = 0,
> + .max_dma_support = 33,
> };
>
> static const struct of_device_id mtk_i2c_of_match[] = {
> @@ -796,11 +797,6 @@ static int mtk_i2c_set_speed(struct mtk_i2c *i2c, unsigned int parent_clk)
> return 0;
> }
>
> -static inline u32 mtk_i2c_set_4g_mode(dma_addr_t addr)
> -{
> - return (addr & BIT_ULL(32)) ? I2C_DMA_4G_MODE : I2C_DMA_CLR_FLAG;
I2C_DMA_4G_MODE define could now be deleted as well.
Regards,
Matthias
> -}
> -
> static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
> int num, int left_num)
> {
> @@ -885,8 +881,8 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
> return -ENOMEM;
> }
>
> - if (i2c->dev_comp->support_33bits) {
> - reg_4g_mode = mtk_i2c_set_4g_mode(rpaddr);
> + if (i2c->dev_comp->max_dma_support > 32) {
> + reg_4g_mode = upper_32_bits(rpaddr);
> writel(reg_4g_mode, i2c->pdmabase + OFFSET_RX_4G_MODE);
> }
>
> @@ -908,8 +904,8 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
> return -ENOMEM;
> }
>
> - if (i2c->dev_comp->support_33bits) {
> - reg_4g_mode = mtk_i2c_set_4g_mode(wpaddr);
> + if (i2c->dev_comp->max_dma_support > 32) {
> + reg_4g_mode = upper_32_bits(wpaddr);
> writel(reg_4g_mode, i2c->pdmabase + OFFSET_TX_4G_MODE);
> }
>
> @@ -954,11 +950,11 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
> return -ENOMEM;
> }
>
> - if (i2c->dev_comp->support_33bits) {
> - reg_4g_mode = mtk_i2c_set_4g_mode(wpaddr);
> + if (i2c->dev_comp->max_dma_support > 32) {
> + reg_4g_mode = upper_32_bits(wpaddr);
> writel(reg_4g_mode, i2c->pdmabase + OFFSET_TX_4G_MODE);
>
> - reg_4g_mode = mtk_i2c_set_4g_mode(rpaddr);
> + reg_4g_mode = upper_32_bits(rpaddr);
> writel(reg_4g_mode, i2c->pdmabase + OFFSET_RX_4G_MODE);
> }
>
> @@ -1232,8 +1228,9 @@ static int mtk_i2c_probe(struct platform_device *pdev)
> return -EINVAL;
> }
>
> - if (i2c->dev_comp->support_33bits) {
> - ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(33));
> + if (i2c->dev_comp->max_dma_support > 32) {
> + ret = dma_set_mask(&pdev->dev,
> + DMA_BIT_MASK(i2c->dev_comp->max_dma_support));
> if (ret) {
> dev_err(&pdev->dev, "dma_set_mask return error.\n");
> return ret;
>
Powered by blists - more mailing lists