linux-kernel - [PATCH] amdgpu: securedisplay: simplify i2c hexdump output

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Date:   Wed, 24 Mar 2021 14:36:52 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Jinzhou Su <Jinzhou.Su@....com>, Huang Rui <ray.huang@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] amdgpu: securedisplay: simplify i2c hexdump output

From: Arnd Bergmann <arnd@...db.de>

A previous fix I did left a rather complicated loop in
amdgpu_securedisplay_debugfs_write() for what could be expressed in a
simple sprintf, as Rasmus pointed out.

This drops the leading 0x for each byte, but is otherwise
much nicer.

Suggested-by: Rasmus Villemoes <linux@...musvillemoes.dk>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c
index 69d7f6bff5d4..fc3ddd7aa6f0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c
@@ -92,9 +92,7 @@ static ssize_t amdgpu_securedisplay_debugfs_write(struct file *f, const char __u
 	struct drm_device *dev = adev_to_drm(adev);
 	uint32_t phy_id;
 	uint32_t op;
-	int i;
 	char str[64];
-	char i2c_output[256];
 	int ret;
 
 	if (*pos || size > sizeof(str) - 1)
@@ -136,12 +134,9 @@ static ssize_t amdgpu_securedisplay_debugfs_write(struct file *f, const char __u
 		ret = psp_securedisplay_invoke(psp, TA_SECUREDISPLAY_COMMAND__SEND_ROI_CRC);
 		if (!ret) {
 			if (securedisplay_cmd->status == TA_SECUREDISPLAY_STATUS__SUCCESS) {
-				int pos = 0;
-				memset(i2c_output,  0, sizeof(i2c_output));
-				for (i = 0; i < TA_SECUREDISPLAY_I2C_BUFFER_SIZE; i++)
-					pos += sprintf(i2c_output + pos, " 0x%X",
-						securedisplay_cmd->securedisplay_out_message.send_roi_crc.i2c_buf[i]);
-				dev_info(adev->dev, "SECUREDISPLAY: I2C buffer out put is :%s\n", i2c_output);
+				dev_info(adev->dev, "SECUREDISPLAY: I2C buffer out put is: %*ph\n",
+					 TA_SECUREDISPLAY_I2C_BUFFER_SIZE,
+					 securedisplay_cmd->securedisplay_out_message.send_roi_crc.i2c_buf);
 			} else {
 				psp_securedisplay_parse_resp_status(psp, securedisplay_cmd->status);
 			}
-- 
2.29.2